Article
Astronomy & Astrophysics
S. Hancock, A. J. Young, P. Chainakun
Summary: We analyzed a sample of 20 active galactic nuclei (AGNs) using the XMM-Newton archive, focusing on the reverberation signatures caused by X-ray reflection from the accretion disc. Our study found that the black hole mass and time lag exhibit a well-recovered scaling relationship, and the continuum flux is strongly coupled to the disc reflection flux. Additionally, we observed a correlation between the reflection fraction and the power-law photon index, suggesting a possible link to the dynamics of the emitting region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
X. Zhao, F. Civano, F. M. Fornasini, D. M. Alexander, N. Cappelluti, C. T. Chen, S. H. Cohen, M. Elvis, P. Gandhi, N. A. Grogin, R. C. Hickox, R. A. Jansen, A. Koekemoer, G. Lanzuisi, W. P. Maksym, A. Masini, D. J. Rosario, M. J. Ward, C. N. A. Willmer, R. A. Windhorst
Summary: The NuSTAR extragalactic survey of the JWST NEP Time-Domain Field covers an area of approximately 0.16 deg(2) with a total exposure of 681ks in nine observations. It is one of the most sensitive extragalactic surveys with NuSTAR, detecting 33 sources above 95 percent reliability in at least one of the five bands. The study also provides preliminary results on multiepoch flux variability in the 3-24 keV band, focusing on candidate Compton-thick AGN fractions and X-ray properties of detected sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
D. De Cicco, F. E. Bauer, M. Paolillo, P. Sanchez-Saez, W. N. Brandt, F. Vagnetti, G. Pignata, M. Radovich, M. Vaccari
Summary: This study investigates the variability of active galactic nuclei (AGN) based on the survey of the COSMOS field by the VLT Survey Telescope. The shape and slope of the AGN's structure function are found to be related to the selection technique, while the variability amplitude is found to be anticorrelated with the accretion rate and bolometric luminosity.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Christian Garrel, Marguerite Pierre, Patrick Valageas, Dominique Eckert, Federico Marulli, Alfonso Veropalumbo, Florian Pacaud, Nicolas Clerc, Mauro Sereno, Keiichi Umetsu, Lauro Moscardini, Sunayana Bhargava, Christophe Adami, Lucio Chiappetti, Fabio Gastaldello, Elias Koulouridis, Jean-Paul Le Fevre, Manolis Plionis
Summary: The study presents forward cosmological analysis of galaxy clusters selected by XMM out to a redshift of unity. Through self-consistent derivation of mass-observable relations, the results show excellent agreement with constraints from baryon acoustic oscillations and the cosmic microwave background, marking a significant improvement compared to previous analyses.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Teng Liu, Andrea Merloni, Julien Wolf, Mara Salvato, Thomas H. Reiprich, Johan Comparat, Riccardo Arcodia, Georg Lamer, Antonis Georgakakis, Tom Dwelly, Jeremy Sanders, Johannes Buchner, Frank Haberl, Miriam E. Ramos-Ceja, Joern Wilms, Kirpal Nandra, Hermann Brunner, Marcella Brusa, Axel Schwope, Jan Robrade, Michael Freyberg, Thomas Boller, Chandreyee Maitra, Angie Veronica, Adam Malyali
Summary: This study presents the X-ray catalog detected from the extra-galactic CalPV observations, using the eROSITA X-ray telescope. A source detection method optimized for point-like X-ray sources was developed, and multiband counterparts were identified using a Bayesian method. The catalog contains 9515 X-ray sources, and counterpart information is available for 77% of the sources. Variabilities were found in 99 sources, and some fields showed unique stellar populations.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Teng Liu, Andrea Merloni, Johan Comparat, Kirpal Nandra, Jeremy Sanders, Georg Lamer, Johannes Buchner, Tom Dwelly, Michael Freyberg, Adam Malyali, Antonis Georgakakis, Mara Salvato, Hermann Brunner, Marcella Brusa, Matthias Klein, Vittorio Ghirardini, Nicolas Clerc, Florian Pacaud, Esra Bulbul, Ang Liu, Axel Schwope, Jan Robrade, Joern Wilms, Thomas Dauser, Miriam E. Ramos-Ceja, Thomas H. Reiprich, Thomas Boller, Julien Wolf
Summary: This study tests and optimizes the source detection procedures of the eROSITA X-ray telescope through simulations, and quantitatively characterizes the detected catalog. Based on the simulation results, a two-pronged strategy is chosen to build eROSITA X-ray catalogs using the most sensitive band and multiband detection. The measurements of the simulated catalogs provide a basis for selecting the catalog thresholds and correcting the raw flux distribution.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
N. Vulic, A. E. Hornschemeier, F. Haberl, A. R. Basu-Zych, E. Kyritsis, A. Zezas, M. Salvato, A. Ptak, A. Bogdan, K. Kovlakas, J. Wilms, M. Sasaki, T. Liu, A. Merloni, T. Dwelly, H. Brunner, G. Lamer, C. Maitra, K. Nandra, A. Santangelo
Summary: The eROSITA Final Equatorial Depth Survey (eFEDS) discovered a rare population of metal-poor dwarf starburst galaxies that do not follow known scaling relations in X-ray emission. The upcoming eROSITA all-sky survey (eRASS:8) is expected to find a significant number of these high-redshift analogues, which are important for studying the heating process of the intergalactic medium at high redshift.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Jeffrey Mckaig, Claudio Ricci, Stephane Paltani, K. K. Gupta, Nicholas P. Abel, Y. Ueda
Summary: This paper investigates the relationship between the scattered component of soft X-ray in obscured active galactic nuclei (AGNs) and the primary X-ray continuum. Through simulations of scattered X-ray radiation, the authors find that the scattered component is related to the inclination angle and covering factor, and the negative correlation between the scattering component and the column density can only be explained by a positive correlation between the column density and the covering factor.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
G. Hasinger, M. Freyberg, E. M. Hu, C. Z. Waters, P. Capak, A. Moneti, H. J. McCracken
Summary: The study analyzed X-ray sources in a region near the north ecliptic pole using ROSAT data, obtaining an X-ray catalog of 805 sources and identifying 766 high-quality optical counterparts through multi-wavelength data; a new population of luminous absorbed X-ray AGN at large redshifts was discovered.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Arghajit Jana, Neeraj Kumari, Prantik Nandi, Sachindra Naik, Arka Chatterjee, Gaurava K. Jaisawal, Kimitake Hayasaki, Claudio Ricci
Summary: The study on the changing-look active galactic nucleus NGC 1566 during its outburst in June 2018 revealed a significant increase in X-ray intensity. Analysis of the X-ray data and modeling showed a strong soft X-ray excess during the outburst, potentially originating from the warm Comptonizing region in the inner accretion disc. The sudden rise in luminosity observed is likely caused by an increase in the accretion rate.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Matteo Guainazzi, Alessandra De Rosa, Stefano Bianchi, Bernd Husemann, Tamara Bogdanovic, Stefanie Komossa, Nora Loiseau, Zsolt Paragi, Miguel Perez-Torres, Enrico Piconcelli, Cristian Vignali
Summary: The research shows that AGN in galaxy pairs are more frequently X-ray obscured by a factor of 1.5 compared to isolated AGNs. The galactic environment has a key influence on triggering nuclear activity in merging galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
D. R. A. Williams, M. Pahari, R. D. Baldi, I. M. McHardy, S. Mathur, R. J. Beswick, A. Beri, P. Boorman, S. Aalto, A. Alberdi, M. K. Argo, B. T. Dullo, D. M. Fenech, D. A. Green, J. H. Knapen, I Marti-Vidal, J. Moldon, C. G. Mundell, T. W. B. Muxlow, F. Panessa, M. Perez-Torres, P. Saikia, F. Shankar, I. R. Stevens, P. Uttley
Summary: Chandra X-ray observations were conducted on a subset of galaxies from the Palomar sample, revealing potential AGN activity in some previously categorized as "inactive" galaxies. The construction of a local galaxy X-ray Luminosity function was also completed through this study.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Arghajit Jana, Claudio Ricci, Sachindra Naik, Atsushi Tanimoto, Neeraj Kumari, Hsiang-Kuang Chang, Prantik Nandi, Arka Chatterjee, Samar Safi-Harb
Summary: We present a detailed study of the highly obscured active galaxy NGC 4507 and explore the properties of the X-ray source and obscuring material. The primary X-ray emission is stable, with a high equatorial column density and variable line-of-sight column density. The covering factor of Compton-Thick material is around 0.35.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Dongyue Li, R. L. C. Starling, R. D. Saxton, Hai-Wu Pan, Weimin Yuan
Summary: We present identifications of a highly variable X-ray source sample from the XMMSL2 catalogue, which significantly increase the understanding and provide a basis for further studies of highly variable X-ray sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Emily Moravec, Jiri Svoboda, Abhijeet Borkar, Peter Boorman, Daniel Kynoch, Francesca Panessa, Beatriz Mingo, Matteo Guainazzi
Summary: This study investigates the observational features of accreting supermassive black holes and stellar mass black holes, explores the similarities between AGNs and XRBs in terms of spectral states, and classifies radio AGNs. The results show that different categories of AGNs occupy distinct regions in the HID, demonstrating similarities to XRBs.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
E. Pouliasis, I Georgantopoulos, A. Ruiz, R. Gilli, E. Koulouridis, M. Akiyama, Y. Ueda, L. Chiappetti, C. Garrel, C. Horellou, T. Nagao, S. Paltani, M. Pierre, Y. Toba, C. Vignali
Summary: X-rays are reliable for identifying active galactic nuclei (AGNs), but in the high-redshift universe, X-ray AGNs are poorly sampled due to their low space density and the limited coverage of X-ray surveys. This work presents a high-redshift (z >= 3.5) X-ray-selected AGN sample, utilizing the latest catalogue and deep optical data, to uncover AGNs at these high redshifts. The sample provides the strongest constraints for high-redshift AGNs at bright fluxes, and these findings emphasize the importance of combining wide-area X-ray surveys with deep optical data for studying high-redshift AGNs.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Tommaso Zana, Simona Gallerani, Stefano Carniani, Fabio Vito, Andrea Ferrara, Alessandro Lupi, Fabio Di Mascia, Paramita Barai
Summary: Quasar feedback slightly increases the effective quasar bias, boosting the number density of observable quasar companions. Deeper observations with JWST and/or ALMA will improve the statistical significance of this result.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
F. Vito, F. Di Mascia, S. Gallerani, T. Zana, A. Ferrara, S. Carniani, R. Gilli
Summary: The use of kinetic feedback in cosmological simulations can decrease the interstellar medium density in host galaxies and match the observed size and brightness of high-redshift AGNs. The geometry of the outflow plays a crucial role in shaping the observed properties of these AGNs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Anesthesiology
Costamagna Andrea, Steinberg Irene, Pivetta Emanuele, Arina Pietro, Veglia Simona, Brazzi Luca, Fanelli Vito
Summary: This study evaluated the reliability of lung ultrasound in monitoring changes in lung aeration during the early and late stages of ARDS. The results showed a significant correlation between LUS scores and CT scans, suggesting that LUS can be used as a reliable tool for detecting changes in lung ventilation.
JOURNAL OF CLINICAL MONITORING AND COMPUTING
(2023)
Article
Astronomy & Astrophysics
L. Armus, T. Lai, V. U, K. L. Larson, T. Diaz-Santos, A. S. Evans, M. A. Malkan, J. Rich, A. M. Medling, D. R. Law, H. Inami, F. Muller-Sanchez, V. Charmandaris, P. van der Werf, S. Stierwalt, S. Linden, G. C. Privon, L. Barcos-Munoz, C. Hayward, Y. Song, P. Appleton, S. Aalto, T. Bohn, T. Boker, M. J. I. Brown, L. Finnerty, J. Howell, K. Iwasawa, F. Kemper, J. Marshall, J. M. Mazzarella, J. McKinney, E. J. Murphy, D. Sanders, J. Surace
Summary: We observed the nearby Seyfert galaxy NGC 7469 using the MIRI instrument on JWST, capturing a high-resolution nuclear spectrum consisting of 19 emission lines. The high-ionization lines exhibited broad, blueshifted emission indicating a decelerating, stratified outflow from the nucleus. The estimated mass outflow rate was larger than the black hole accretion rate needed to power the AGN. Additionally, we detected rotational H-2 emission lines and a weak PAH feature. These early MIRI mid-infrared IFU observations demonstrate the capabilities of JWST in studying the interstellar media surrounding active supermassive black holes.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Fabio Di Mascia, Stefano Carniani, Simona Gallerani, Fabio Vito, Andrea Pallottini, Andrea Ferrara, Milena Valentini
Summary: A study finds that when the radiation from AGN is included in simulations, the SFR of host galaxies is overestimated by approximately ten times, suggesting that AGN plays an effective role in heating dust in the host galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alessandra De Rosa, Cristian Vignali, Paola Severgnini, Stefano Bianchi, Tamara Bogdanovic, Maria Charisi, Matteo Guainazzi, Zoltan Haiman, S. Komossa, Zsolt Paragi, Miguel Perez-Torres, Enrico Piconcelli, Lorenzo Ducci, Manali Parvatikar, Roberto Serafinelli
Summary: This study investigates optically selected dual Active Galactic Nuclei (AGN) and compares them with isolated systems. The analysis reveals that mergers may trigger more luminous AGN. X-ray spectral analysis and comparison with observed X-ray luminosity confirm higher obscuration in AGN pairs. The absorbing material is likely associated with the torus or broad-line regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Steven Rossland, Daniel R. Wik, Brian Grefenstette, Nico Cappelluti, Francesca Civano, Fabio Gastaldello, Roberto Gilli, Fiona Harrison, Ann Hornschemeier, Ryan Hickox, Roman Krivonos, Kristin Madsen, Silvano Molendi, Andrew Ptak, Daniel Stern, Andreas Zoglauer
Summary: By characterizing the contribution of stray light to large data sets from the CXB Measurement X-ray observatory, we report a measurement of the cosmic X-ray background (CXB) in the 3-20 keV energy range. The data obtained represent 20% sky coverage and have less influence from deep survey fields. We used a fitting method to establish baseline flux values and obtained spectra of the CXB, which are in agreement with previous measurements.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Stefano Marchesi, Marco Mignoli, Roberto Gilli, Giovanni Mazzolari, Matilde Signorini, Marisa Brienza, Susanna Bisogni, Micol Bolzonella, Olga Cucciati, Quirino D'Amato, Alessandro Peca, Isabella Prandoni, Paolo Tozzi, Cristian Vignali, Fabio Vito, Andrea Comastri
Summary: We conducted a spectroscopic campaign with the MODS instrument on the LBT to obtain spectroscopic redshifts for seven Chandra J1030 sources. Five out of seven targets were successfully obtained with a redshift greater than or equal to 2.5, confirming the reliability of the Chandra J1030 photometric redshifts. Additionally, we discovered a large-scale structure (LSS) with a redshift of approximately 2.78 in the J1030 field, which contains X-ray sources and non-X-ray-detected galaxies. Our findings also suggest that massive galaxies with a stellar mass greater than 10 are excellent tracers of LSSs and filaments in the cosmic web.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
K. Iwasawa, C. Norman, R. Gilli, P. Gandhi, M. A. Perez-Torres
Summary: We present a spatially resolved, X-ray spectroscopic study of the diffuse emission found in the central part of nearby starburst galaxy M 82, providing new details and important conclusions about the nature and origin of the hot gas and its impact on the interstellar medium. Using archival data from the Chandra X-ray Observatory, we find that the Fe XXV emission is enhanced only in a limited area close to the starburst disc, indicating the presence of non-thermal emission due to inverse Compton scattering. Our study also suggests that the majority of the 4-8 keV luminosity originates from inverse Compton emission, while the metal-rich hot gas makes a minor contribution to the continuum but accounts for the observed Fe XXV line. Furthermore, we find that the hot gas emerges from the circumnuclear starburst ring and fills the galactic chimneys identified as mid-infrared and radio emission voids, suggesting that supernova energy in the starburst site is transported to the halo through these chimneys.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
A. Viitanen, V. Allevato, A. Finoguenov, F. Shankar, R. Gilli, G. Lanzuisi, F. Vito
Summary: To test AGN unification and evolutionary models, the clustering properties of AGNs were measured based on their obscuration defined in terms of hydrogen column density. A large sample of X-ray-selected AGNs from multiple surveys was used, and the clustering was measured as a function of obscuration and redshift. The results indicate that AGN clustering does not significantly depend on obscuration, suggesting similar masses of hosting halos regardless of obscuration levels. The increase in AGN bias with redshift follows the passive evolution track, indicating that the clustering is mainly driven by the growth rate of hosting halos and galaxies over cosmic time.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Fan Zou, W. N. Brandt, Qingling Ni, Shifu Zhu, David M. Alexander, Franz E. Bauer, Chien-Ting J. Chen, Bin Luo, Mouyuan Sun, Cristian Vignali, Fabio Vito, Yongquan Xue, Wei Yan
Summary: In this study, active dwarf galaxies were searched for using X-ray observations. A total of 73 active dwarf galaxies were identified beyond the local universe, making it the largest sample to date. These galaxies were found to have similar environments as inactive dwarf galaxies, and the accretion distribution was negatively correlated with X-ray luminosity.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
J. Rich, S. Aalto, A. S. Evans, V. Charmandaris, G. C. Privon, T. Lai, H. Inami, S. Linden, L. Armus, T. Diaz-Santos, P. Appleton, L. Barcos-Munoz, T. Boker, K. L. Larson, D. R. Law, M. A. Malkan, A. M. Medling, Y. Song, P. van der Werf, T. Bohn, M. J. I. Brown, L. Finnerty, C. Hayward, J. Howell, K. Iwasawa, F. Kemper, J. Marshall, J. M. Mazzarella, J. McKinney, F. Muller-Sanchez, E. J. Murphy, D. Sanders, B. T. Soifer, S. Stierwalt, J. Surace
Summary: We conducted integral-field spectroscopy on the nearby luminous infrared galaxy VV 114 using the MIRI and NIRSpec instruments. Our results reveal the presence of an active galactic nucleus in the SW core and provide evidence of deeply embedded star formation as well as extended shocked regions and outflows in the NE core. These observations are crucial for understanding the physical properties of VV 114.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Sean T. Linden, Aaron S. Evans, Lee Armus, Jeffrey A. Rich, Kirsten L. Larson, Thomas Lai, George C. Privon, U. Vivian, Hanae Inami, Thomas Bohn, Yiqing Song, Loreto Barcos-Munoz, Vassilis Charmandaris, Anne M. Medling, Sabrina Stierwalt, Tanio Diaz-Santos, Torsten Boker, Paul van der Werf, Susanne Aalto, Philip Appleton, Michael J. I. Brown, Christopher C. Hayward, Justin H. Howell, Kazushi Iwasawa, Francisca Kemper, David T. Frayer, David Law, Matthew A. Malkan, Jason Marshall, Joseph M. Mazzarella, Eric J. Murphy, David Sanders, Jason Surace
Summary: We used the NIRCam of the James Webb Space Telescope to investigate the young massive star cluster population in the luminous infrared galaxy VV 114. We identified 374 compact YMC candidates and found that 20% of them are undetected at optical wavelengths. The discovery of hidden sources in VV 114 significantly increased the number of young star clusters and confirmed a steep age distribution slope for all the massive star clusters.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Meriem Behiri, Margherita Talia, Andrea Cimatti, Andrea Lapi, Marcella Massardi, Andrea Enia, Cristian Vignali, Matthieu Bethermin, Andreas Faisst, Fabrizio Gentile, Marika Giulietti, Carlotta Gruppioni, Francesca Pozzi, Vernesa Smolcic, Gianni Zamorani
Summary: This study aims to fill the knowledge gap of radio-selected NIR-dark sources and investigate their contribution through visual inspection of the sources' environment and calibration of photometric procedures. The research estimates that RS-NIRdark sources contribute approximately 10%-25% to the star formation rate density in the early universe.
ASTROPHYSICAL JOURNAL
(2023)