Article
Astronomy & Astrophysics
Ewan O'Sullivan, Francoise Combes, Arif Babul, Scott Chapman, Kedar A. Phadke, Gerrit Schellenberger, Philippe Salome
Summary: The study presents the distribution of molecular gas around and within a galaxy, featuring extended clumps, low velocity dispersion, and concentration in certain regions. The unusually extended gas falls within the thermal instability radius, indicating that gas cooling is not strongly affected by the buried quasi-stellar object.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
W. Kollatschny, D. Grupe, M. L. Parker, M. W. Ochmann, N. Schartel, E. Romero-Colmenero, H. Winkler, S. Komossa, P. Famula, M. A. Probst, M. Santos-Lleo
Summary: IRAS 23226-3843, a changing-look AGN, experienced a strong X-ray and UV flux outburst in 2019. During the outburst, it showed significant variations in the X-ray and optical continuum, as well as changes in the H α emission-line profiles. One year later, its optical spectral type changed to become a Seyfert type 2 object.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
F. G. Saturni, G. Vietri, E. Piconcelli, C. Vignali, M. Bischetti, A. Bongiorno, S. Cazzoli, C. Feruglio, F. Fiore, B. Husemann, C. Ramos Almeida
Summary: The study analyzed the optical spectral properties of the merging system IRAS 20210+1121, confirming the presence of AGN features in both interacting galaxies, with one showing evidence of AGN-powered outflow events. Future spatially resolved spectroscopy will allow for further investigation of the gas kinematics in this AGN pair and evaluation of the impact of the outflow on the galaxy environment.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
XueGuang Zhang
Summary: In this manuscript, a 3.8 yr optical quasi-periodic oscillation (QPO) is reported in the blue quasar SDSS J132144+033055 (SDSS J1321). The study confirms the existence of the QPO through various analysis methods, indicating the presence of a central binary black hole system with a small space separation. Disc precession and jet precession are ruled out as explanations for the observed QPO, and its significance is confirmed to be higher than 3 sigma. The combination of long-term light curves from CSS and ZTF could lead to the discovery of more QPO candidates in the future.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xueguang Zhang
Summary: In this manuscript, a 6.4-year optical quasi-periodic oscillations (QPOs) in the quasar SDSS J0752 at a redshift of 0.117 have been detected and confirmed through various analysis methods. The observed QPOs strongly suggest the presence of a central binary black hole (BBH) system. The determined properties of the BBH system, such as the spatial separation and the virial black hole masses, are reported. The study also rules out the possibility of the observed QPOs being explained by disc precessions or jet precessions. The existence of the optical QPOs is further supported by statistical analysis using randomly created light curves.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
E. Benitez, E. Jimenez-Bailon, C. A. Negrete, D. Ruschel-Dutra, J. M. Rodriguez-Espinosa, I Cruz-Gonzalez, L. F. Rodriguez, V. H. Chavushyan, P. Marziani, L. Gutierrez, O. Gonzalez-Martin, B. W. Jiang, M. D'Onofrio
Summary: We have studied the nuclear region of the previously detected dual AGN system in the galaxy pair IRAS 05589 + 2828 and 2MASX J06021107 + 2828382, and our findings suggest that they conform to a dual AGN system with evidence of an ongoing merger. We estimated their properties and masses through optical, radio, and X-ray observations, and confirmed their dual AGN nature in the radio bands.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Yong-Jie Chen, Jun-Rong Liu, Shuo Zhai, Zhu-Heng Yao, Yan-Rong Li, Pu Du, Chen Hu, Wei-Jian Guo, Ming Xiao, Yu-Yang Songsheng, Jian-Min Wang
Summary: In this study, optical and mid-infrared light curves were compiled to measure the time lags between different wavelengths and constrain the relationships between torus sizes and AGN properties. The results show that the torus sizes are correlated with black hole mass and accretion rate. This study is important for understanding the formation and evolution of AGNs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Marcin Marculewicz, Marek Nikolajuk, Agata Rozanska
Summary: We studied the anomalous deep absorption in a distant quasar SDSS J110511.15+530806.5 and estimated the velocity of the absorbing material. We found that this absorption significantly affects the measurement of black hole mass in massive quasars using common virial mass estimators.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
C. Martin Gaskell, Frances C. Anderson, Sufia A. Birmingham, Samhita Ghosh
Summary: We estimate the reddening of NGC 5548 using seven different methods. The reddening curves considered include Gaskell & Benker's relatively flat AGN reddening curve, an SMC reddening curve, and a standard Milky Way curve. Regardless of the curve adopted, we find a total reddening of approximately 14 times greater than the dust reddening in the solar neighborhood. The derived reddening is consistent with previous estimates for type-1 AGNs and has implications for the size estimation of the accretion disc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
XueGuang Zhang
Summary: In this paper, a potential sub-pc binary black hole (BBH) system in SDSS J1257+2023 is reported based on different properties of broad Balmer emission lines. The broad Hα line in SDSS J1257+2023 is significantly broader than the broad Hβ line, with a width ratio of 0.69, which is quite different from the normal line width ratio of 1.1 in quasars. The broader component in the broad Hα line can be confidently confirmed through the F-test technique and different model functions. The detection of optical quasi-periodic oscillations (QPOs) with a periodicity of about 1000 days in the BBH system of SDSS J1257+2023 is supported by the Zwicky Transient Facility (ZTF) light curves and the generalized Lomb-Scargle periodogram with a confidence level higher than 3σ.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Jian-Min Wang, Pu Du, Yu-Yang Songsheng, Yan-Rong Li
Summary: Spiral arms in broad emission lines provide information about ionized gas in BLRs. The radius of BLRs overlaps with that of accretion disks, and the resulting spiral arms lead to various profiles of broad emission lines.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Lukas J. Furtak, Ramesh Mainali, Adi Zitrin, Adele Plat, Seiji Fujimoto, Megan Donahue, Erica J. Nelson, Franz E. Bauer, Ryosuke Uematsu, Gabriel B. Caminha, Felipe Andrade-Santos, Larry D. Bradley, Karina Caputi, Stephane Charlot, Jacopo Chevallard, Dan Coe, Emma Curtis-Lake, Daniel Espada, Brenda L. Frye, Kirsten K. Knudsen, Anton M. Koekemoer, Kotaro Kohno, Vasily Kokorev, Nicolas Laporte, Minju M. Lee, Brian C. Lemaux, Georgios E. Magdis, Keren Sharon, Daniel P. Stark, Yuanyuan Su, Katherine A. Suess, Yoshihiro Ueda, Hideki Umehata, Alba Vidal-Garcia, John F. Wu
Summary: We report the discovery of a triply imaged active galactic nucleus (AGN) lensed by the galaxy cluster MACS J0035.4-2015. This AGN has a de-magnified radius of r(e) less than or similar to 100 pc and is spectroscopically confirmed to be at z spec = 2.063 +/- 0.005. It is relatively faint for a quasar-like object and shows variation in its emission over time.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alessia Tortosa, Claudio Ricci, Francesco Tombesi, Luis C. Ho, Pu Du, Kohei Inayoshi, Jian-Min Wang, Jinyi Shangguan, Ruancun Li
Summary: This study presents the analysis of the physical properties of the accretion flow and X-ray emitting plasma in supermassive black holes accreting at extreme Eddington rates. The simultaneous observations of IRAS 04416+1215 with XMM-Newton and NuSTAR reveal interesting spectral features, including multiphase absorption structure, a soft excess component, and a hard X-ray emission dominated by a reflection component.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
X. G. Zhang
Summary: In this study, we discuss the properties of a mis-classified quasar, SDSS J1451+2709, which is classified as a H ii galaxy in the BPT diagram. By measuring its emission lines, we find that different model functions lead to different determined fluxes, but the different flux ratios of narrow emission lines classify it as a H ii galaxy. Two methods are proposed to explain the unique properties, but further research is needed to find the physical origin.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Amorim, M. Bauboeck, W. Brandner, M. Bolzer, Y. Clenet, R. Davies, P. T. de Zeeuw, J. Dexter, A. Drescher, A. Eckart, F. Eisenhauer, N. M. Forster Schreiber, F. Gao, P. J. Garcia, R. Genzel, S. Gillessen, D. Gratadour, S. Honig, D. Kaltenbrunner, M. Kishimoto, S. Lacour, D. Lutz, F. Millour, H. Netzer, T. Ott, T. Paumard, K. Perraut, G. Perrin, B. M. Peterson, P. O. Petrucci, O. Pfuhl, M. A. Prieto, D. Rouan, J. Sanchez-Bermudez, J. Shangguan, T. Shimizu, M. Schartmann, J. Stadler, A. Sternberg, O. Straub, C. Straubmeier, E. Sturm, L. J. Tacconi, K. R. W. Tristram, P. Vermot, S. von Fellenberg, I Waisberg, F. Widmann, J. Woillez
Summary: Using VLTI/GRAVITY and SINFONI data, the study investigated the subparsec gas and dust structure around the nearby AGN hosted by NGC 3783. The size and kinematics of the BLR, hot dust, and CLR were analyzed simultaneously, revealing a rotating disc structure for the BLR, a FWHM size of 0.74 mas for the hot dust, and a FWHM size of 2.2 mas for the CLR. This comprehensive mapping allowed for a detailed understanding of the gas and dust structure and dynamics from 0.01 to 100 pc.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Fabrizio Fiore, Andrea Ferrara, Manuela Bischetti, Chiara Feruglio, Andrea Travascio
Summary: By studying 134 galaxies in the redshift range of 6.5 < z < 16, it is found that there is a negative correlation between interstellar dust content and Eddington ratio, which also increases with redshift. The research reveals that galaxies with a specific star formation rate may generate powerful outflows, clearing the dust within the galaxies.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
K. George, B. M. Poggianti, N. Tomicic, J. Postma, P. Cote, J. Fritz, S. K. Ghosh, M. Gullieuszik, J. B. Hutchings, A. Moretti, A. Omizzolo, M. Radovich, P. Sreekumar, A. Subramaniam, S. N. Tandon, B. Vulcani
Summary: Spiral galaxies experience strong ram-pressure effects when entering galaxy clusters, resulting in gas stripping and the formation of extended tails with jellyfish-like appearance. Ultraviolet observations of jellyfish galaxies JW39, JO60, and JO194 reveal star formation knots in the disc and tails, with strong correlation between their UV and H alpha flux. Optical emission line ratio maps identify emission mechanisms (star formation, LINER, or mix) in different regions, with star-forming regions matching regions with significant UV flux.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Environmental Sciences
M. Laurenza, D. Del Moro, T. Alberti, R. Battiston, S. Benella, F. Benvenuto, F. Berrilli, I. Bertello, B. Bertucci, L. Biasiotti, C. Campi, V. Carbone, M. Casolino, C. Cecchi Pestellini, F. Chiappetta, I. Coco, S. Colombo, G. Consolini, R. D'Amicis, G. De Gasperis, R. De Marco, A. Del Corpo, P. Diego, V. Di Felice, L. Di Fino, C. Di Geronimo, F. Faldi, F. Ferrente, C. Feruglio, E. Fiandrini, F. Fiore, R. Foldes, V. Formato, G. Francisco, F. Giannattasio, M. Giardino, P. Giobbi, L. Giovannelli, M. Giusti, A. Gorgi, B. Heilig, G. Iafrate, S. L. Ivanovski, G. Jerse, M. B. Korsos, F. Lepreti, D. Locci, C. Magnafico, V. Mangano, M. F. Marcucci, M. Martucci, S. Massetti, G. Micela, A. Milillo, R. Miteva, M. Molinaro, R. Mugatwala, A. Mura, G. Napoletano, L. Narici, C. Neubuser, G. Nistico, M. Pauluzzi, A. Perfetti, S. Perri, A. Petralia, M. Pezzopane, M. Piersanti, E. Pietropaolo, A. Pignalberi, C. Plainaki, G. Polenta, L. Primavera, G. Romoli, M. Rossi, L. Santarelli, G. Santi Amantini, F. Siciliano, G. Sindoni, S. Spadoni, R. Sparvoli, M. Stumpo, N. Tomassetti, R. Tozzi, V. Vagelli, N. Vasantharaju, A. Vecchio, M. Vellante, S. Vernetto, C. Vigorito, M. J. West, G. Zimbardo, P. Zucca, F. Zuccarello, P. Zuccon
Summary: This paper presents the CAESAR project, which aims to tackle the relevant aspects of Space Weather (SWE) science and develop a prototype of the scientific data centre for Space Weather of the Italian Space Agency (ASI) called ASPIS. The project involves 10 Italian institutions as partners and a total of 92 researchers, investigating the whole chain of phenomena from the Sun to Earth up to planetary environments in a multidisciplinary and comprehensive way. The ASPIS prototype will unify multiple SWE resources through a flexible and adaptable architecture, integrating currently available international SWE assets to advance forecasting capabilities.
Article
Astronomy & Astrophysics
Alfredo Luminari, Andrea Marinucci, Stefano Bianchi, Barbara de Marco, Chiara Feruglio, Giorgio Matt, Riccardo Middei, Emanuele Nardini, Enrico Piconcelli, Simonetta Puccetti, Francesco Tombesi
Summary: We report on the 2019 XMM-Newton+NuSTAR monitoring campaign of the Seyfert galaxy NGC 2992, which showed ultrafast outflows (UFOs) absorbing structures and wind variability. Using a novel model, we estimated the outflowing gas velocity, column density, and ionization state, revealing significant mass outflow rates and associated momentum and kinetic energy rates. The results suggest that the wind may have significant feedback effects between the AGN and the host galaxy.
ASTROPHYSICAL JOURNAL
(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
Asa F. L. Bluck, Joanna M. Piotrowska, Roberto Maiolino
Summary: We used a machine-learning approach to investigate the intrinsic dependence of star formation quenching on galactic and environmental parameters. Our results showed that black hole mass is the most important parameter in predicting the quenching of central galaxies, while black hole accretion rate has little predictive power. This is important for observational studies, as it suggests that current AGN state cannot be used as a proxy for the impact of AGN feedback.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Jesus M. Jaquez-Dominguez, Roberto Galvan-Madrid, Jacopo Fritz, Manuel Zamora-Aviles, Peter Camps, Gustavo Bruzual, Maarten Baes, Yuxin Lin, Enrique Vazquez-Semadeni
Summary: A direct comparison between hydrodynamical simulations and observations is necessary for improving the models and testing their biases. By applying the SKIRT radiative-transfer code to simulations of a star-forming cloud, and analyzing the synthetic observations using traditional methods, we found that additional interstellar radiation is necessary in the early stages of the simulation. The morphological evolution of the cloud continues for about 8 Myr due to the expansion of H ii regions and the creation of various structures.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Benedetta Vulcani, Tommaso Treu, Antonello Calabro, Jacopo Fritz, Bianca M. Poggianti, Pietro Bergamini, Andrea Bonchi, Kristan Boyett, Gabriel B. Caminha, Marco Castellano, Alan Dressler, Adriano Fontana, Karl Glazebrook, Claudio Grillo, Matthew A. Malkan, Sara Mascia, Amata Mercurio, Emiliano Merlin, Benjamin Metha, Takahiro Morishita, Themiya Nanayakkara, Diego Paris, Guido Roberts-Borsani, Piero Rosati, Namrata Roy, Paola Santini, Michele Trenti, Eros Vanzella, Xin Wang
Summary: We used JWST/NIRCam imaging and MUSE data to study galaxies in the cluster Abell2744 and its surroundings. We found a population of galaxies with red colors in F200W-F444W, even in the field region. These galaxies have normal F115W-F150W colors but are redder than red sequence galaxies in F200W-F444W. Many cluster galaxies show signs of ram pressure stripping, while field galaxies have features resembling interactions and mergers. We hypothesize that these galaxies have dust-enshrouded star formation.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Roberta Tripodi, Chiara Feruglio, Francisca Kemper, Francesca Civano, Tiago Costa, Martin Elvis, Manuela Bischetti, Stefano Carniani, Fabio Di Mascia, Valentina D'Odorico, Fabrizio Fiore, Simona Gallerani, Michele Ginolfi, Roberto Maiolino, Enrico Piconcelli, Rosa Valiante, Luca Zappacosta
Summary: We present ALMA Band 9 continuum observation of the ultraluminous quasi-stellar object (QSO) SDSS J0100+2802, and study its dust spectral energy distribution to determine the dust properties and the star formation rate (SFR) of its host galaxy. Our results provide the most accurate estimates of the dust temperature, mass, and emissivity index, and allow us to measure the SFR with the smallest statistical error for this QSO. We find that the black hole is dominating the process of black-hole galaxy growth in this QSO.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
David Perez-Millan, Jacopo Fritz, Rosa A. Gonzalez-Lopezlira, Alessia Moretti, Bernardo Cervantes Sodi, Benedetta Vulcani, Marco Gullieuszik, Gustavo Bruzual, Stephane Charlot, Daniela Bettoni
Summary: Observed properties of galaxies are influenced by their total stellar mass and morphology, as well as the environment. This study uses spectrophotometric data from the WINGS and OmegaWINGS surveys to investigate both the local and large-scale environmental effects on star formation activity in clusters. Comparisons with field galaxies reveal that local effects have a stronger impact on galaxy properties, highlighting the importance of considering morphology in understanding the influence of clusters on galaxy evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Oli L. Dors, M. Valerdi, R. A. Riffel, R. Riffel, M. Cardaci, G. F. Hagele, Mark Armah, M. Revalski, S. R. Flury, P. Freitas-Lemes, E. B. Amores, A. C. Krabbe, L. Binette, A. Feltre, T. Storchi-Bergmann
Summary: For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of Seyfert 2 nuclei (Sy 2s) was determined via direct estimation of electron temperature. The study found that the temperatures in the gas region where most of the S (+) ions are located in Sy 2s are similar to that of star-forming regions (SFs). However, Sy 2s have higher temperature values in the region where most of the S2+ ions are located. The sulphur abundance values in Sy 2s are lower than those in SFs with similar metallicity, indicating a distinct chemical enrichment of the interstellar medium (ISM) for Sy 2s.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Matteo Quirino, Giulia Sciarrone, Raffaele Piazzolla, Fabio Fuschino, Yuri Evangelista, Gianluca Morgante, Manfredo Guilizzoni, Luca Marocco, Stefano Silvestrini, Fabrizio Fiore, Michele Lavagna
Summary: Scientific payloads onboard CubeSats often have complex geometries and narrower temperature ranges compared to the rest of the spacecraft. A thermal balance test is necessary to accurately predict the payload's thermal behavior in orbit and validate the numerical thermal model. This paper describes the configuration and procedures of the thermal balance test conducted on the Demonstration Model of the payload for the HERMES constellation. The test results demonstrate the reliability of the applied method for space thermal analyses and led to modifications in the payload design to lower the operational temperature on critical equipment.
APPLIED SCIENCES-BASEL
(2023)
Editorial Material
Astronomy & Astrophysics
Emma Curtis-Lake, Asa Bluck, Francesco d'Eugenio, Roberto Maiolino, Debora Sijacki
Summary: Star formation in the Universe has been decreasing over the past ten billion years. Astronomers gathered at the University of Cambridge to discuss the causes and themes of galaxy quenching.
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)
Article
Astronomy & Astrophysics
Michaela Hirschmann, Stephane Charlot, Anna Feltre, Emma Curtis-Lake, Rachel S. Somerville, Jacopo Chevallard, Ena Choi, Dylan Nelson, Christophe Morisset, Adele Plat, Alba Vidal-Garcia
Summary: This study computes the optical and ultraviolet emission-line properties of galaxies at different redshifts using cosmological simulations and nebular-emission models. It finds that the emission-line galaxy population is dominated by different ionizing sources at low redshifts, and by star-forming and active galaxies at high redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
