☆ 4.7 Article

NuSTAR AND INTEGRAL OBSERVATIONS OF A LOW/HARD STATE OF 1E1740.7-2942

ASTROPHYSICAL JOURNAL (2014)

Journal

ASTROPHYSICAL JOURNAL

Volume 780, Issue 1, Pages -

Publisher

IOP PUBLISHING LTD

DOI: 10.1088/0004-637X/780/1/63

Keywords

accretion, accretion disks; black hole physics; X-rays: binaries; X-rays: individual (1E 1740.7-2942)

Categories

Astronomy & Astrophysics

Funding

NASA [NNG08FD60C]
Italian Space Agency (ASI) by ASI/INAF [I/037/12/0-011/13, I/033/10/0]
Centre National d'Etudes Spatiales (CNES)

Ask authors/readers for more resources

Protocol

Community support

Reagent

Community support

Abstract

The microquasar 1E1740.7-2942, also known as the Great Annihilator, was observed by NuSTAR in the summer of 2012. We have analyzed in detail two observations taken similar to 2 weeks apart, for which we measure hard and smooth spectra typical of the low/hard state. A few weeks later the source flux declined significantly. Nearly simultaneous coverage by INTEGRAL is available from its Galactic Center monitoring campaign lasting similar to 2.5 months. These data probe the hard state spectrum from 1E1740.7-2942 before the flux decline. We find good agreement between the spectra taken with IBIS/ISGRI and NuSTAR, with the measurements being compatible with a change in flux with no spectral variability. We present a detailed analysis of the NuSTAR spectral and timing data and upper limits for reflection of the high energy emission. We show that the high energy spectrum of this X-ray binary is well described by thermal Comptonization.

Authors

I am an author on this paper

Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7

Not enough ratings

Secondary Ratings

Novelty

-

Significance

-

Scientific rigor

-

Rate this paper

Recommended

Article Astronomy & Astrophysics

Broad-band X-ray properties of black holes GRS 1758-258 and 1E 1740.7-2942: AstroSat and NuSTAR results

G. R. Bhuvana, U. Aneesha, D. Radhika, Vivek K. Agrawal, Samir Mandal, Tilak Katoch, Anuj Nandi

Summary: In this study, the broad-band X-ray properties of persistent black hole binaries GRS 1758-258 and 1E 1740.7-2942 were analyzed using observations from AstroSat, NuSTAR, and Swift-XRT. It was found that GRS 1758-258 exhibits both a dim-soft state and a hard state, while 1E 1740.7-2942 is only in the hard state. Reflection modeling revealed unique characteristics of each source, such as high metal abundance and inclination angle. These findings have important implications for understanding accretion dynamics.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Astronomy & Astrophysics

The flickering radio jet from the quiescent black hole X-ray binary A0620-00

Donna L. dePolo, Richard M. Plotkin, James C. A. Miller-Jones, Jay Strader, Thomas J. Maccarone, Tyrone N. O'Doherty, Laura Chomiuk, Elena Gallo

Summary: This study presents the results of a radio monitoring campaign of A0620 - 00, one of the best-studied and least-luminous known quiescent black hole X-ray binaries. The observations reveal significant variability in the radio emission of A0620 - 00, and the comparison with V404 Cyg suggests that less luminous jets are less variable in quiescence.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

Add to Collection

Article Astronomy & Astrophysics

Swift J1728.9-3613 is a black hole X-ray binary: a spectral and timing study using NICER

Debasish Saha, Manoj Mandal, Sabyasachi Pal

Summary: We studied the timing and spectral properties of the new Galactic X-ray transient Swift J1728.9-3613 using NICER and Swift. The source exhibited multiple transitions to different spectral states during the outburst, forming a 'q'-shaped track in the hardness-intensity diagram. A partial hysteresis was observed in the RMS-intensity diagram, indicating its classification as a black hole transient. Power-density spectra in soft intermediate states showed broad-band noise components and two type-B quasi-periodic oscillations. Based on the evolution of timing and spectral properties, Swift J1728.9-3613 is concluded to be a black hole X-ray binary.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Astronomy & Astrophysics

Advection-dominated accretion flow for the varied transition luminosities in black hole X-ray binaries

Jiaqi Li, Erlin Qiao

Summary: This paper re-investigates the transition luminosities in black hole X-ray binaries (BH-XRBs) and derives fitting formulae for the transition rates as functions of the viscosity parameter alpha. The study finds that the value of alpha significantly affects the state transition, suggesting the existence of two classes of alpha values in further exploring the accretion physics in BH-XRBs.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Astronomy & Astrophysics

NICER uncovers the transient nature of the type-B quasi-periodic oscillation in the black hole candidate MAXI J1348-630

L. Zhang, D. Altamirano, P. Uttley, F. Garcia, M. Mendez, J. Homan, J. F. Steiner, K. Alabarta, D. J. K. Buisson, R. A. Remillard, K. C. Gendreau, Z. Arzoumanian, C. Markwardt, T. E. Strohmayer, J. Neilsen, A. Basak

Summary: The study reveals that the generation of type-B QPO is associated with a redistribution of accretion power between the disc and Comptonized emission, with more power dissipated into the radiative region when the type-B QPO appears. Additionally, changes in radiative flux were observed in the spectral analysis.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Add to Collection

Article Astronomy & Astrophysics

MAXI J1820+070 X-ray spectral-timing reveals the nature of the accretion flow in black hole binaries

Tenyo Kawamura, Chris Done, Magnus Axelsson, Tadayuki Takahashi

Summary: Black hole X-ray binaries exhibit stochastic variability on short time scales, with complex lags in correlated variability observed across different energy bands. This is usually explained by a model where slow fluctuations originating at large radii propagate through the accretion flow, modulating faster fluctuations generated at smaller radii. By incorporating radially stratified emission, it becomes possible to measure the propagation time scale from data, enabling direct tests of the accretion flow structure. However, when applying a previously developed model to higher energy variability data from the Insight-Hard X-ray Modulation Telescope (HXMT), it fails to accurately fit the observed behavior.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Astronomy & Astrophysics

Failed-transition outbursts in black hole low-mass X-ray binaries

K. Alabarta, D. Altamirano, M. Mendez, V. A. Cuneo, F. M. Vincentelli, N. Castro-Segura, F. Garcia, B. Luff, A. Veledina

Summary: Black hole low-mass X-ray binaries (BH LMXBs) undergo evolution during outbursts, with common events being 'failed-transition outbursts' (FT outbursts) where the source never reaches the high/soft state. Both FT and full outbursts are driven by the same physical process and initial X-ray data do not distinguish between the two types.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

Add to Collection

Article Astronomy & Astrophysics

Spin measurement of 4U 1543-47 with Insight-HXMT and NICER from its 2021 outburst A test of accretion disk models at high luminosities

E. S. Yorgancioglu, Q. C. Bu, A. Santangelo, L. Tao, S. W. Davis, A. Vahdat, L. D. Kong, S. Piraino, M. Zhou, S. N. Zhang

Summary: The unprecedented bright outburst of black hole candidate 4U 1543-47 provides valuable insights into the behavior of accretion disk models and spin measurements at high luminosities and accretion rates.

ASTRONOMY & ASTROPHYSICS (2023)

Add to Collection

Article Astronomy & Astrophysics

Extending the theory of propagating fluctuations: the first fully relativistic treatment and analytical Fourier-Green's functions

Andrew Mummery

Summary: This paper discusses the "theory of propagating fluctuations" in the aperiodic variability observed in accreting black hole X-ray binary systems. It derives the Fourier transforms of the Green's function solutions of the thin disc equations and finds solutions for both Newtonian discs and general relativistic solutions with a vanishing ISCO stress. The study highlights the spin dependence of observable variability properties of black hole discs and suggests that observations of aperiodic variability may provide a new way to directly constrain black hole spins.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Astronomy & Astrophysics

A NuSTAR and Swift view of the hard state of MAXI J1813-095

Jiachen Jiang, Douglas J. K. Buisson, Thomas Dauser, Andrew C. Fabian, Felix Furst, Luigi C. Gallo, Fiona A. Harrison, Michael L. Parker, James F. Steiner, John A. Tomsick, Santiago Ubach, Dominic J. Walton

Summary: In this study, the NuSTAR and Swift spectra of the black hole candidate MAXI J1813-095 in a failed-transition outburst in 2018 were analyzed. The analysis revealed evidence of reflected emission from the inner region of the accretion disc and provided insights into the inner radius of the disc. The spectral variability of MAXI J1813-095 was found to be dominated by the variable photon index of the Comptonization emission.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

Add to Collection

Article Astronomy & Astrophysics

The Spin Measurement of MAXI J0637-430: a Black Hole Candidate with High Disk Density

Nan Jia, Ye Feng, Yu-Jia Song, Jun Yang, Jieun Yuh, Pei-Jun Huang, Li-Jun Gou

Summary: We studied the spectral properties of the Galactic black hole candidate MAXI J0637-430 using NuSTAR and Swift/XRT data. By fitting the spectra with a disk component and a powerlaw component model, we found a black hole spin a* > 0.72 and an inclination angle i = 46.1(-5.34)(+4.0) degrees for the accretion disk. The fitting results also suggest an extreme supersolar iron abundance, possibly due to a high-density accretion disk or a strong Fe K alpha emission line. Additionally, a soft excess was observed in the soft state spectral fitting results, which may be caused by free-free heating effect from the high density of the accretion disk. The robustness of black hole spin obtained by X-ray reflection spectroscopy was discussed, showing that the spin results are independent of iron abundance and disk density.

RESEARCH IN ASTRONOMY AND ASTROPHYSICS (2023)

Add to Collection

Article Astronomy & Astrophysics

Evidence for an expanding corona based on spectral-timing modelling of multiple black hole X-ray binaries

Zheng Cao, Matteo Lucchini, Sera Markoff, Riley M. T. Connors, Victoria Grinberg

Summary: Studying galactic black hole X-ray binaries (BHXBs) provides insight into accretion processes, with the interaction and geometrical similarity of coronas and jets being crucial factors during hard and hard-intermediate states.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

Add to Collection

Article Astronomy & Astrophysics

NuSTAR View of the R - Γ Correlation in the Hard State of Black Hole Low-mass X-Ray Binaries

Yanting Dong, Zhu Liu, Xinwu Cao

Summary: The power law and reflection emission in X-ray spectra of black hole X-ray binaries and active galactic nuclei indicate a common physical origin. By analyzing NuSTAR data, a positive correlation is found between the photon index Gamma and the reflection strength R in low-mass black hole X-ray binaries in the hard state, supporting the moving corona model. Comparisons with different theoretical disk-corona models show significant variations in coronal geometry among black hole X-ray binaries. The reflection strength R is smaller in black hole X-ray binaries compared to active galactic nuclei, suggesting more vigorous variations in disk-coronal geometry in the latter.

RESEARCH IN ASTRONOMY AND ASTROPHYSICS (2023)

Add to Collection

Article Astronomy & Astrophysics

The Width-Flux Relation of the Broad Iron Kα Line during the State Transitions of the Black Hole X-Ray Binaries

Hang-Ying Shui, Fu-Guo Xie, Zhen Yan, Ren-Yi Ma

Summary: The study investigates the relation between the normalized intensity and the width of iron lines in black hole X-ray binaries during state transitions. Three scenarios were studied, and it was found that the cloud model best explains the observations. The study also modeled the iron line profiles and found that the cloud model can explain both the line profile and its variation with reasonable parameters.

RESEARCH IN ASTRONOMY AND ASTROPHYSICS (2023)

Add to Collection

Article Astronomy & Astrophysics

Fast transitions of X-ray variability in the black hole transient GX 339-4: comparison with MAXI J1820+070 and MAXI J1348-630

Zi-Xu Yang, Liang Zhang, S. N. Zhang, M. Mendez, Federico Garcia, Yue Huang, Qingcui Bu, He-Xin Liu, Wei Yu, P. J. Wang, L. Tao, D. Altamirano, Jin-Lu Qu, S. Zhang, X. Ma, L. M. Song, S. M. Jia, M. Y. Ge, Q. Z. Liu, J. Z. Yan, T. M. Li, X. Q. Ren, R. C. Ma, Yuexin Zhang, Y. C. Xu, B. Y. Ma, Y. F. Du, Y. C. Fu, Y. X. Xiao, P. P. Li, P. Jin, S. J. Zhao, Q. C. Zhao

Summary: In this paper, we present a broad-band spectral-timing analysis of fast transitions observed in the black hole X-ray binary GX 339-4. The transitions include shifts between band-limited noise-dominated power density spectra and type-B quasi-periodic oscillations, accompanied by rapid appearance or disappearance. Comparative studies with other sources, MAXI J1820+070 and MAXI J1348-630, reveal variations in spectral ratios above and below 10 keV, indicating an association between the appearance of type-B quasi-periodic oscillations and a redistribution of accretion power. The spectral ratios between periods with and without type-B quasi-periodic oscillations differ significantly from ratios between periods with type-B quasi-periodic oscillations and broad-band noise.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Astronomy & Astrophysics

Polarization Properties of the Weakly Magnetized Neutron Star X-Ray Binary GS 1826-238 in the High Soft State

Fiamma Capitanio, Sergio Fabiani, Andrea Gnarini, Francesco Ursini, Carlo Ferrigno, Giorgio Matt, Juri Poutanen, Massimo Cocchi, Romana Mikusincova, Ruben Farinelli, Stefano Bianchi, Jari J. E. Kajava, Fabio Muleri, Celia Sanchez-Fernandez, Paolo Soffitta, Kinwah Wu, Ivan Agudo, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolo Di Lalla, Alessandro Di Marco, Immacolata Donnarumma, Victor Doroshenko, Michal Dovciak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G. Jorstad, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Ikuyuki Mitsuishi, Tsunefumi Mizuno, C. -Y. Ng, Stephen L. O'Dell, Nicola Omodei, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Roger W. Romani, Carmelo Sgro, Patrick Slane, Gloria Spandre, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Fei Xie, Silvia Zane

Summary: The launch of IXPE on December 9, 2021 has provided a new perspective in X-ray astronomy. In this study, we present the first observation results of GS 1826-238, a weakly magnetized neutron star, using IXPE on March 29-31, 2022. The upper limit of linear polarization degree (99.73% confidence level) is found to be 1.3% in the energy range of 2-8 keV. Coordinated observations with INTEGRAL and NICER were conducted simultaneously to constrain the geometry and inclination angle of GS 1826-238.

ASTROPHYSICAL JOURNAL (2023)

Add to Collection

Article Astronomy & Astrophysics

A Light in the Dark: Searching for Electromagnetic Counterparts to Black Hole-Black Hole Mergers in LIGO/Virgo O3 with the Zwicky Transient Facility

Matthew J. Graham, Barry McKernan, K. E. Saavik Ford, Daniel Stern, S. G. Djorgovski, Michael Coughlin, Kevin B. Burdge, Eric C. Bellm, George Helou, Ashish A. Mahabal, Frank J. Masci, Josiah Purdum, Philippe Rosnet, Ben Rusholme

Summary: This study describes a search for electromagnetic (EM) counterparts to binary black hole (BBH) mergers detected by LIGO/Virgo in the accretion disks of active galactic nuclei (AGNs). Nine candidate EM counterparts were found, and it is expected that more candidates will be discovered in future observations. These candidate EM counterparts are of great importance for measuring cosmic expansion (H(0)) as an independent method.

ASTROPHYSICAL JOURNAL (2023)

Add to Collection

Article Astronomy & Astrophysics

A Machine-learning Approach to Predict Missing Flux Densities in Multiband Galaxy Surveys

Nima Chartab, Bahram Mobasher, Asantha R. Cooray, Shoubaneh Hemmati, Zahra Sattari, Henry C. Ferguson, David B. Sanders, John R. Weaver, Daniel K. Stern, Henry J. McCracken, Daniel C. Masters, Sune Toft, Peter L. Capak, Iary Davidzon, Mark E. Dickinson, Jason Rhodes, Andrea Moneti, Olivier Ilbert, Lukas Zalesky, Conor J. R. McPartland, Istvan Szapudi, Anton M. Koekemoer, Harry I. Teplitz, Mauro Giavalisco

Summary: We propose a new method based on information theory to determine the optimal number of bands required for accurate measurement of physical properties of galaxies. Using the COSMOS2020 catalog, we identify the most relevant bands for measuring physical properties of galaxies in a H20 and UVISTA-like survey. We find that certain bands provide the most information for redshift and stellar mass measurements, and a machine-learning model trained over extensive spectral coverage outperforms template fitting.

ASTROPHYSICAL JOURNAL (2023)

Add to Collection

Article Astronomy & Astrophysics

X-Ray Polarization Observations of BL Lacertae

Riccardo Middei, Ioannis Liodakis, Matteo Perri, Simonetta Puccetti, Elisabetta Cavazzuti, Laura Di Gesu, Steven R. Ehlert, Grzegorz Madejski, Alan P. Marscher, Herman L. Marshall, Fabio Muleri, Michela Negro, Svetlana G. Jorstad, Beatriz Agis-Gonzalez, Ivan Agudo, Giacomo Bonnoli, Maria Bernardos, Victor Casanova, Maya Garcia-Comas, Cesar Husillos, Alessandro Marchini, Alfredo Sota, Pouya M. Kouch, Elina Lindfors, George A. Borman, Evgenia N. Kopatskaya, Elena G. Larionova, Daria A. Morozova, Sergey S. Savchenko, Andrey A. Vasilyev, Alexey Zhovtan, Carolina Casadio, Juan Escudero, Ioannis Myserlis, Antonio Hales, Seiji Kameno, Ruediger Kneissl, Hugo Messias, Hiroshi Nagai, Dmitry Blinov, Ioakeim G. Bourbah, Sebastian Kiehlmann, Evangelos Kontopodis, Nikos Mandarakas, Stylianos Romanopoulos, Raphael Skalidis, Anna Vervelaki, Joseph R. Masiero, Dimitri Mawet, Maxwell A. Millar-Blanchaer, Georgia Panopoulou, Samaporn Tinyanont, Andrei Berdyugin, Masato Kagitani, Vadim Kravtsov, Takeshi Sakanoi, Ryo Imazawa, Mahito Sasada, Yasushi Fukazawa, Koji S. Kawabata, Makoto Uemura, Tsunefumi Mizuno, Tatsuya Nakaoka, Hiroshi Akitaya, Mark Gurwell, Ramprasad Rao, Niccolo Di Lalla, Nicolo Cibrario, Immacolata Donnarumma, Dawoon E. Kim, Nicola Omodei, Luigi Pacciani, Juri Poutanen, Fabrizio Tavecchio, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Fiamma Capitanio, Simone Castellano, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Alessandro Di Marco, Victor Doroshenko, Michal Dovciak, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, C-Y Ng, Stephen L. O'Dell, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Roger W. Romani, Carmelo Sgro, Patrick Slane, Paolo Soffitta, Gloria Spandre, Toru Tamagawa, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Kinwah Wu, Fei Xie, Silvia Zane

Summary: A multiwavelength polarization analysis of BL Lacertae suggests that proton-synchrotron radiation does not significantly contribute to its X-ray emission, providing support for a leptonic origin.

ASTROPHYSICAL JOURNAL LETTERS (2023)

Add to Collection

Review Astronomy & Astrophysics

The Athena X-ray Integral Field Unit: a consolidated design for the system requirement review of the preliminary definition phase

Didier Barret, Vincent Albouys, Jan-Willem den Herder, Luigi Piro, Massimo Cappi, Juhani Huovelin, Richard Kelley, J. Miguel Mas-Hesse, Stephane Paltani, Gregor Rauw, Agata Rozanska, Jiri Svoboda, Joern Wilms, Noriko Yamasaki, Marc Audard, Simon Bandler, Marco Barbera, Xavier Barcons, Enrico Bozzo, Maria Teresa Ceballos, Ivan Charles, Elisa Costantini, Thomas Dauser, Anne Decourchelle, Lionel Duband, Jean-Marc Duval, Fabrizio Fiore, Flavio Gatti, Andrea Goldwurm, Roland den Hartog, Brian Jackson, Peter Jonker, Caroline Kilbourne, Seppo Korpela, Claudio Macculi, Mariano Mendez, Kazuhisa Mitsuda, Silvano Molendi, Francois Pajot, Etienne Pointecouteau, Frederick Porter, Gabriel W. Pratt, Damien Prele, Laurent Ravera, Kosuke Sato, Joop Schaye, Keisuke Shinozaki, Konrad Skup, Jan Soucek, Tanguy Thibert, Jacco Vink, Natalie Webb, Laurence Chaoul, Desi Raulin, Aurora Simionescu, Jose Miguel Torrejon, Fabio Acero, Graziella Branduardi-Raymont, Stefano Ettori, Alexis Finoguenov, Nicolas Grosso, Jelle Kaastra, Pasquale Mazzotta, Jon Miller, Giovanni Miniutti, Fabrizio Nicastro, Salvatore Sciortino, Hiroya Yamaguchi, Sophie Beaumont, Edoardo Cucchetti, Matteo D'Andrea, Megan Eckart, Philippe Ferrando, Elias Kammoun, Simone Lotti, Jean-Michel Mesnager, Lorenzo Natalucci, Philippe Peille, Jelle de Plaa, Florence Ardellier, Andrea Argan, Elise Bellouard, Jerome Carron, Elisabetta Cavazzuti, Mauro Fiorini, Pourya Khosropanah, Sylvain Martin, James Perry, Frederic Pinsard, Alice Pradines, Manuela Rigano, Peter Roelfsema, Denis Schwander, Guido Torrioli, Joel Ullom, Isabel Vera, Eduardo Medinaceli Villegas, Monika Zuchniak, Frank Brachet, Ugo Lo Cicero, William Doriese, Malcom Durkin, Valentina Fioretti, Herve Geoffray, Lionel Jacques, Christian Kirsch, Stephen Smith, Joseph Adams, Emilie Gloaguen, Ruud Hoogeveen, Paul van der Hulst, Mikko Kiviranta, Jan van der Kuur, Aurelien Ledot, Bert-Joost Van Leeuwen, Dennis van Loon, Bertrand Lyautey, Yann Parot, Kazuhiro Sakai, Henk van Weers, Shariefa Abdoelkariem, Thomas Adam, Christophe Adami, Corinne Aicardi, Hiroki Akamatsu, Pablo Eleazar Merino Alonso, Roberta Amato, Jerome Andre, Matteo Angelinelli, Manuel Anon-Cancela, Shebli Anvar, Ricardo Atienza, Anthony Attard, Natalia Auricchio, Ana Balado, Florian Bancel, Lorenzo Ferrari Barusso, Arturo Bascunan, Vivian Bernard, Alicia Berrocal, Sylvie Blin, Donata Bonino, Francois Bonnet, Patrick Bonny, Peter Boorman, Charles Boreux, Ayoub Bounab, Martin Boutelier, Kevin Boyce, Daniele Brienza, Marcel Bruijn, Andrea Bulgarelli, Simona Calarco, Paul Callanan, Alberto Prada Campello, Thierry Camus, Florent Canourgues, Vito Capobianco, Nicolas Cardiel, Florent Castellani, Oscar Cheatom, James Chervenak, Fabio Chiarello, Laurent Clerc, Nicolas Clerc, Beatriz Cobo, Odile Coeur-Joly, Alexis Coleiro, Stephane Colonges, Leonardo Corcione, Mickael Coriat, Alexandre Coynel, Francesco Cuttaia, Antonino D'Ai, Fabio D'anca, Mauro Dadina, Christophe Daniel, Lea Dauner, Natalie DeNigris, Johannes Dercksen, Michael DiPirro, Eric Doumayrou, Luc Dubbeldam, Michel Dupieux, Simon Dupourque, Jean Louis Durand, Dominique Eckert, Valvanera Eiriz, Eric Ercolani, Christophe Etcheverry, Fred Finkbeiner, Mariateresa Fiocchi, Herve Fossecave, Philippe Franssen, Martin Frericks, Stefano Gabici, Florent Gant, Jian-Rong Gao, Fabio Gastaldello, Ludovic Genolet, Simona Ghizzardi, Ma Angeles Alcacera Gil, Elisa Giovannini, Olivier Godet, Javier Gomez-Elvira, Raoul Gonzalez, Manuel Gonzalez, Luciano Gottardi, Dolores Granat, Michel Gros, Nicolas Guignard, Paul Hieltjes, Adolfo Jesus Hurtado, Kent Irwin, Christian Jacquey, Agnieszka Janiuk, Jean Jaubert, Maria Jimenez, Antoine Jolly, Thierry Jourdan, Sabine Julien, Bartosz Kedziora, Andrew Korb, Ingo Kreykenbohm, Ole Koenig, Mathieu Langer, Philippe Laudet, Philippe Laurent, Monica Laurenza, Jean Lesrel, Sebastiano Ligori, Maximilian Lorenz, Alfredo Luminari, Bruno Maffei, Oceane Maisonnave, Lorenzo Marelli, Didier Massonet, Irwin Maussang, Alejandro Gonzalo Melchor, Isabelle Le Mer, Francisco Javier San Millan, Jean-Pierre Millerioux, Teresa Mineo, Gabriele Minervini, Alexei Molin, David Monestes, Nicola Montinaro, Baptiste Mot, David Murat, Kenichiro Nagayoshi, Yael Naze, Loic Nogues, Damien Pailot, Francesca Panessa, Luigi Parodi, Pascal Petit, Enrico Piconcelli, Ciro Pinto, Jose Miguel Encinas Plaza, Borja Plaza, David Poyatos, Thomas Prouve, Andy Ptak, Simonetta Puccetti, Elena Puccio, Pascale Ramon, Manuel Reina, Guillaume Rioland, Louis Rodriguez, Anton Roig, Bertrand Rollet, Mauro Roncarelli, Gilles Roudil, Tomasz Rudnicki, Julien Sanisidro, Luisa Sciortino, Vitor Silva, Michael Sordet, Javier Soto-Aguilar, Pierre Spizzi, Christian Surace, Miguel Fernandez Sanchez, Emanuele Taralli, Guilhem Terrasa, Regis Terrier, Michela Todaro, Pietro Ubertini, Michela Uslenghi, Jan Geralt Bij de Vaate, Davide Vaccaro, Salvatore Varisco, Peggy Varniere, Laurent Vibert, Maria Vidriales, Fabrizio Villa, Boris Martin Vodopivec, Angela Volpe, Cor de Vries, Nicholas Wakeham, Gavin Walmsley, Michael Wise, Martin de Wit, Grzegorz Wozniak

Summary: The Athena X-IFU is a high-resolution X-ray spectrometer that has been studied since 2015 for use in the Athena space X-ray Observatory. It uses Transition Edge Sensors (TES) to provide spatially resolved X-ray spectroscopy with a spectral resolution of 2.5 eV. The X-IFU will be provided by an international consortium led by France, The Netherlands, and Italy, with contributions from several other countries including the United States and Japan.

EXPERIMENTAL ASTRONOMY (2023)

Add to Collection

Article Astronomy & Astrophysics

A High Fraction of Heavily X-Ray-obscured Active Galactic Nuclei

Christopher M. Carroll, Tonima T. Ananna, Ryan C. Hickox, Alberto Masini, Roberto J. Assef, Daniel Stern, Chien-Ting J. Chen, Lauranne Lanz

Summary: We estimate the fraction of heavily obscured AGNs to be fCT=0.555 using a simulation and emphasize the importance of a multiwavelength approach for identifying more AGNs.

ASTROPHYSICAL JOURNAL (2023)

Add to Collection

Article Astronomy & Astrophysics

X-Ray Polarization of BL Lacertae in Outburst

Abel L. Peirson, Michela Negro, Ioannis Liodakis, Riccardo Middei, Dawoon E. Kim, Alan P. Marscher, Herman L. Marshall, Luigi Pacciani, Roger W. Romani, Kinwah Wu, Alessandro Di Marco, Niccolo Di Lalla, Nicola Omodei, Svetlana G. Jorstad, Ivan Agudo, Pouya M. Kouch, Elina Lindfors, Francisco Jose Aceituno, Maria I. Bernardos, Giacomo Bonnoli, Victor Casanova, Maya Garcia-Comas, Beatriz Agis-Gonzalez, Cesar Husillos, Alessandro Marchini, Alfredo Sota, Carolina Casadio, Juan Escudero, Ioannis Myserlis, Albrecht Sievers, Mark Gurwell, Ramprasad Rao, Ryo Imazawa, Mahito Sasada, Yasushi Fukazawa, Koji S. Kawabata, Makoto Uemura, Tsunefumi Mizuno, Tatsuya Nakaoka, Hiroshi Akitaya, Yeon Cheong, Hyeon-Woo Jeong, Sincheol Kang, Sang-Hyun Kim, Sang-Sung Lee, Emmanouil Angelakis, Alexander Kraus, Nicolo Cibrario, Immacolata Donnarumma, Juri Poutanen, Fabrizio Tavecchio, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Victor Doroshenko, Michal Dovciak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Philip Kaaret, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Grzegorz Madejski, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, Fabio Muleri, C. -Y. Ng, Stephen L. O'Dell, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Oliver J. Roberts, Carmelo Sgro, Patrick Slane, Paolo Soffitta, Gloria Spandre, Douglas A. Swartz, Toru Tamagawa, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Fei Xie, Silvia Zane

Summary: We report the first >99% confidence detection of X-ray polarization in BL Lacertae, which was observed during a recent X-ray/gamma-ray outburst. The X-ray data suggest that the IXPE energy band is at the crossover between the low- and high-frequency blazar emission humps. Significant variability and polarization were observed, and the relative contribution from each emission hump was determined. The findings support the dominance of synchrotron self-Compton emission over hadronic emission processes during the observed epochs.

ASTROPHYSICAL JOURNAL LETTERS (2023)

Add to Collection

Article Astronomy & Astrophysics

The IXPE View of GRB 221009A

Michela Negro, Niccolo Di Lalla, Nicola Omodei, Peter Veres, Stefano Silvestri, Alberto Manfreda, Eric Burns, Luca Baldini, Enrico Costa, Steven R. Ehlert, Jamie A. Kennea, Ioannis Liodakis, Herman L. Marshall, Sandro Mereghetti, Riccardo Middei, Fabio Muleri, Stephen L. O'Dell, Oliver J. Roberts, Roger W. Romani, Carmelo Sgro, Masanobu Terashima, Andrea Tiengo, Domenico Viscolo, Alessandro Di Marco, Fabio La Monaca, Luca Latronico, Giorgio Matt, Matteo Perri, Simonetta Puccetti, Juri Poutanen, Ajay Ratheesh, Daniele Rogantini, Patrick Slane, Paolo Soffitta, Elina Lindfors, Kari Nilsson, Anni Kasikov, Alan P. Marscher, Fabrizio Tavecchio, Nicolo Cibrario, Shuichi Gunji, Christian Malacaria, Alessandro Paggi, Yi-Jung Yang, Silvia Zane, Martin C. Weisskopf, Ivan Agudo, Lucio A. Antonelli, Matteo Bachetti, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Immacolata Donnarumma, Victor Doroshenko, Michal Dovciak, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G. Jorstad, Philip Kaaret, Vladimir Karas, Fabian Kislat, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Simone Maldera, Frederic Marin, Andrea Marinucci, Ikuyuki Mitsuishi, Tsunefumi Mizuno, C. -Y. Ng, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Brian D. Ramsey, John Rankin, Gloria Spandre, Douglas A. Swartz, Toru Tamagawa, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Roberto Turolla, Jacco Vink, Kinwah Wu, Fei Xie

Summary: This study presents the observation results of GRB 221009A, including upper limits on the linear polarization degree of both prompt and afterglow emission in the soft X-ray energy band. This research provides constraints on the properties of the GRB emission region, such as the jet opening angle and the viewing angle.

ASTROPHYSICAL JOURNAL LETTERS (2023)

Add to Collection

Article Astronomy & Astrophysics

The Pan-STARRS1 z > 5.6 Quasar Survey. II. Discovery of 55 Quasars at 5.6 < z < 6.5

Eduardo Banados, Jan-Torge Schindler, Bram P. Venemans, Thomas Connor, Roberto Decarli, Emanuele Paolo Farina, Chiara Mazzucchelli, Romain A. Meyer, Daniel Stern, Fabian Walter, Xiaohui Fan, Joseph F. Hennawi, Yana Khusanova, Nidia Morrell, Riccardo Nanni, Gael Noirot, Antonio Pensabene, Hans-Walter Rix, Joseph Simon, Gijs A. Verdoes Kleijn, Zhang-Liang Xie, Da-Ming Yang, Andrew Connor

Summary: We confirm the existence of 55 quasars at redshifts 5.6 < z < 6.5 through optical and near-infrared surveys. Some notable sources include a potential gravitationally lensed quasar and a quasar located in the outskirts of the nearby spiral galaxy M81. These quasars will contribute to further studies of high-redshift quasar populations.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2023)

Add to Collection

Article Astronomy & Astrophysics

Uncovering the geometry of the hot X-ray corona in the Seyfert galaxy NGC 4151 with IXPE

V. E. Gianolli, D. E. Kim, S. Bianchi, B. Agis-Gonzalez, G. Madejski, F. Marin, A. Marinucci, G. Matt, R. Middei, P. O. Petrucci, P. Soffitta, D. Tagliacozzo, F. Tombesi, F. Ursini, T. Barnouin, A. De Rosa, L. Di Gesu, A. Ingram, V. Loktev, C. Panagiotou, J. Podgorny, J. Poutanen, S. Puccetti, A. Ratheesh, A. Veledina, W. Zhang, I. Agudo, L. A. Antonelli, M. Bachetti, L. Baldini, W. H. Baumgartner, R. Bellazzini, S. D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, C. T. Chen, S. Ciprini, E. Costa, E. Del Monte, N. Di Lalla, A. Di Marco, I. Donnarumma, V. Doroshenko, M. Dovciak, S. R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J. A. Garcia, S. Gunji, J. Heyl, W. Iwakiri, S. G. Jorstad, P. Kaaret, V. Karas, F. Kislat, T. Kitaguchi, J. J. Kolodziejczak, H. Krawczynski, F. La Monaca, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, A. P. Marscher, H. L. Marshall, F. Massaro, I. Mitsuishi, T. Mizuno, F. Muleri, M. Negro, C. -Y. Ng, S. L. O'Dell, N. Omodei, C. Oppedisano, A. Papitto, G. G. Pavlov, A. L. Peirson, M. Perri, M. Pesce-Rollins, M. Pilia, A. Possenti, B. D. Ramsey, J. Rankin, O. J. Roberts, R. W. Romani, C. Sgro, P. Slane, G. Spandre, D. A. Swartz, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A. F. Tennant, N. E. Thomas, A. Trois, S. S. Tsygankov, R. Turolla, J. Vink, M. C. Weisskopf, K. Wu, F. Xie, S. Zane

Summary: In this study, X-ray spectropolarimetric analysis of the Seyfert galaxy NGC 4151 revealed a polarization degree of 4.9% ± 1.1% and an angle of 86° ± 7° in the 2-8 keV energy range. The analysis suggests that the polarization may be entirely due to reflection and that the hot corona of NGC 4151 has a slab-like geometry, possibly a wedge.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Multidisciplinary Sciences

X-ray polarization evidence for a 200-year-old flare of Sgr A

Frederic Marin, Eugene Churazov, Ildar Khabibullin, Riccardo Ferrazzoli, Laura Di Gesu, Thibault Barnouin, Alessandro Di Marco, Riccardo Middei, Alexey Vikhlinin, Enrico Costa, Paolo Soffitta, Fabio Muleri, Rashid Sunyaev, William Forman, Ralph Kraft, Stefano Bianchi, Immacolata Donnarumma, Pierre-Olivier Petrucci, Teruaki Enoto, Ivan Agudo, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Alessandra De Rosa, Ettore Del Monte, Niccolo Di Lalla, Victor Doroshenko, Michal Dovciak, Steven R. Ehlert, Yuri Evangelista, Sergio Fabiani, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Adam Ingram, Wataru Iwakiri, Svetlana G. Jorstad, Philip Kaaret, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Michela Negro, C. -Y Ng, Stephen L. O'Dell, Nicola Omodei, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Maura Pilia, Andrea Possenti, Juri Poutanen, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Oliver J. Roberts, Roger W. Romani, Carmelo Sgro, Patrick Slane, Gloria Spandre, Doug Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Kinwah Wu, Fei Xie, Silvia Zane

Summary: By studying the X-ray reflection from giant molecular clouds near the black hole Sagittarius A* (Sgr A), scientists have found evidence of past flaring activity. The observations show that the reflected X-ray emission is polarized, indicating that approximately 200 years ago, the X-ray luminosity of Sgr A* was similar to that of a Seyfert galaxy.

NATURE (2023)

Add to Collection

Article Astronomy & Astrophysics

X-ray polarimetry of the accreting pulsar GX 301-2

Valery F. Suleimanov, Sofia V. Forsblom, Sergey S. Tsygankov, Juri Poutanen, Victor Doroshenko, Rosalia Doroshenko, Fiamma Capitanio, Alessandro Di Marco, Denis Gonzalez-Caniulef, Jeremy Heyl, Fabio La Monaca, Alexander A. Lutovinov, Sergey V. Molkov, Christian Malacaria, Alexander A. Mushtukov, Andrey E. Shtykovsky, Ivan Agudo, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolo Di Lalla, Immacolata Donnarumma, Michal Dovciak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Wataru Iwakiri, Svetlana G. Jorstad, Philip Kaaret, Vladimir Karas, Fabian Kislat, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Fabio Muleri, Michela Negro, Chi-Yung Ng, Stephen L. O'Dell, Nicola Omodei, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Oliver J. Roberts, Roger W. Romani, Carmelo Sgro, Patrick Slane, Paolo Soffitta, Gloria Spandre, Douglas A. Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Kinwah Wu, Fei Xie, Silvia Zane

Summary: Phase- and energy-resolved polarization measurements were conducted to test emission models and determine emission region geometry of the accreting X-ray pulsar GX 301-2. Observations with IXPE resulted in a low polarization signal, although significant polarization was detected in certain phase bins.

ASTRONOMY & ASTROPHYSICS (2023)

Add to Collection

Article Astronomy & Astrophysics

IXPE and XMM-Newton Observations of the Soft Gamma Repeater SGR 1806-20

Roberto Turolla, Roberto Taverna, Gian Luca Israel, Fabio Muleri, Silvia Zane, Matteo Bachetti, Jeremy Heyl, Alessandro Di Marco, Ephraim Gau, Henric Krawczynski, Mason Ng, Andrea Possenti, Juri Poutanen, Luca Baldini, Giorgio Matt, Michela Negro, Ivan Agudo, Lucio A. Antonelli, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Chieng-Ting Chen, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolo Di Lalla, Immacolata Donnarumma, Victor Doroshenko, Michal Dovciak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Wataru Iwakiri, Svetlana G. Jorstad, Philip Kaaret, Vladimir Karas, Fabian Kislat, Takao Kitaguchi, Jeffery J. Kolodziejczak, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Alan P. Marscher, Herman L. Marshall, Francesco Massaro, Ikuyuki Mitsuishi, Tsunefumi Mizuno, C. -y. Ng, Stephen L. O'Dell, Nicola Omodei, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Simonetta Puccetti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Oliver J. Roberts, Roger W. Romani, Carmelo Sgro, Patrick Slane, Paolo Soffitta, Gloria Spandre, Douglas A. Swartz, Toru Tamagawa, Fabrizio Tavecchio, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Jacco Vink, Martin C. Weisskopf, Kinwah Wu, Fei Xie

Summary: Recent joint observations with IXPE and XMMNewton of the soft.-repeater SGR 1806-20 revealed strong polarization in its X-ray emission, with the source found at an all-time low persistent flux level. The detection of probable polarization at 4-5 keV energy range suggests a resonance Compton scattering mechanism in the magnetosphere, similar to that proposed for another bright magnetar 4U 0142+61.

ASTROPHYSICAL JOURNAL (2023)

Add to Collection

Article Astronomy & Astrophysics

X-ray polarimetry of X-ray pulsar X Persei: another orthogonal rotator?

A. A. Mushtukov, S. S. Tsygankov, J. Poutanen, V. Doroshenko, A. Salganik, E. Costa, A. Di Marco, J. Heyl, F. La Monaca, A. A. Lutovinov, I. A. Mereminsky, A. Papitto, A. N. Semena, A. E. Shtykovsky, V. F. Suleimanov, S. V. Forsblom, D. Gonzalez-Caniulef, C. Malacaria, R. A. Sunyaev, I. Agudo, L. A. Antonelli, M. Bachetti, L. Baldini, W. H. Baumgartner, R. Bellazzini, S. Bianchi, S. D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, C. -T. Chen, S. Ciprini, A. De Rosa, E. Del Monte, L. Di Gesu, N. Di Lalla, I. Donnarumma, M. Dovciak, S. R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J. A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S. G. Jorstad, P. Kaaret, V. Karas, F. Kislat, T. Kitaguchi, J. J. Kolodziejczak, H. Krawczynski, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. P. Marscher, H. L. Marshall, F. Massaro, G. Matt, I. Mitsuishi, T. Mizuno, F. Muleri, M. Negro, C. -Y. Ng, S. L. O'Dell, N. Omodei, C. Oppedisano, G. G. Pavlov, A. L. Peirson, M. Perri, M. Pesce-Rollins, P. -O. Petrucci, M. Pilia, A. Possenti, S. Puccetti, B. D. Ramsey, J. Rankin, A. Ratheesh, O. J. Roberts, R. W. Romani, C. Sgro, P. . Slane, P. . Soffitta, G. Spandre, D. A. Swartz, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A. F. Tennant, N. E. Thomas, F. Tombesi, A. Trois, R. Turolla, J. Vink, M. C. Weisskopf, K. Wu, F. Xie, S. Zane

Summary: X Persei is a highly magnetized X-ray pulsar with a low luminosity and a period of 835 seconds. Observations with the IXPE revealed a strong dependency of the X-ray polarization signal on the pulsar's spin phase. The polarization degree varied from several to approximately 20% over the pulse, with a phase dependence resembling the pulse profile. The polarimetric data also implied a large angle between the rotation and magnetic dipole axes.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

Add to Collection

Article Astronomy & Astrophysics

Long-exposure NuSTAR constraints on decaying dark matter in the Galactic halo

Brandon M. Roach, Steven Rossland, Kenny C. Y. Ng, Kerstin Perez, John F. Beacom, Brian W. Grefenstette, Shunsaku Horiuchi, Roman Krivonos, Daniel R. Wik

Summary: We present two complementary NuSTAR x-ray searches for keV-scale dark matter decaying to monoenergetic photons in the Milky Way halo. Finding no evidence of anomalous x-ray lines using either method, we set limits on the active-sterile mixing angle and sterile-neutrino masses. The first key result is that we strongly disfavor a 7-keV sterile neutrino decaying into a 3.5-keV photon, and the second is that we derive leading limits on sterile neutrinos with masses 15-18 keV and 25-40 keV, reaching or extending below the big bang nucleosynthesis limit. In combination with previous results, the parameter space for the neutrino minimal standard model is now nearly closed.

PHYSICAL REVIEW D (2023)

Add to Collection

No Data Available

© Peeref 2019-2024. All rights reserved.