Results 101 to 110 of about 18,849 (212)

VaDAR: Varstrometry for Dual AGN Using Radio Interferometry

The Astrophysical Journal
Binary and dual active galactic nuclei (AGNs) are an important observational tool for studying the formation and dynamical evolution of galaxies and supermassive black holes.
Emma Schwartzman, Tracy E. Clarke, Kristina Nyland, Nathan J. Secrest, Ryan W. Pfeifle, Henrique Schmitt, Shobita Satyapal, Barry Rothberg   +7 more
doaj   +1 more source

Techniques for Profile Binning and Analysis of Eigenvector Composite Spectra: Comparing Hbeta and MgII 2800 as Virial Estimators

, 2013
We review the basic techniques for extracting information about quasar structure and kinematics from the broad emission lines in quasars. We consider which lines can most effectively serve as virial estimators of black hole mass.
del Olmo, Ascension, Marziani, Paola, Plauchu-Frayn, Ilse, Sulentic, Jack W.   +3 more
core   +1 more source

Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. I. The Hβ Broad-line Region Structure and Black Hole Masses of Five Quasars

The Astrophysical Journal
We conduct a reverberation mapping (RM) campaign to spectroscopically monitor a sample of selected bright active galactic nuclei with large anticipated broad-line region (BLR) sizes adequate for spectroastrometric (SA) observations by the GRAVITY ...
Yan-Rong Li, Chen Hu, Zhu-Heng Yao, Yong-Jie Chen, Hua-Rui Bai, Sen Yang, Pu Du, Feng-Na Fang, Yi-Xin Fu, Jun-Rong Liu, Yue-Chang Peng, Yu-Yang Songsheng, Yi-Lin Wang, Ming Xiao, Shuo Zhai, Hartmut Winkler, Jin-Ming Bai, Luis C. Ho, Romain G. Petrov, Jesús Aceituno, Jian-Min Wang, SARM Collaboration   +21 more
doaj   +1 more source

Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]

Sci Adv, 2023
Shen L, Liu G, He Z, Zakamska NL, Glikman E, Greene JE, Hu W, Mou G, Wylezalek D, Rupke DSN.   +9 more
europepmc   +1 more source

Varstrometry for Dual Active Galactic Nuclei Using Radio Interferometry: VaDAR with the VLBA

The Astrophysical Journal
Multiple active galactic nuclei (multi-AGN) are a known result of galaxy mergers. Therefore, they are an important tool for studying the formation and dynamical evolution of galaxies and supermassive black holes. A novel method for the selection of multi-
Emma Schwartzman, Paula Fudolig, Tracy E. Clarke, Kristina Nyland, Nathan J. Secrest, Ryan W. Pfeifle, Henrique Schmitt, Shobita Satyapal, Barry Rothberg   +8 more
doaj   +1 more source

Active Galactic Nuclei and Host Galaxies in COSMOS-Web. II. First Look At the Kiloparsec-scale Dual and Offset AGN Population

The Astrophysical Journal
Kiloparsec-scale dual and offset active galactic nuclei (AGNs) are signposts of accreting supermassive black holes (SMBHs) triggered during late-stage galaxy mergers, offering crucial insights into the coevolution of SMBHs and galaxies. However, robustly
Junyao Li, Ming-Yang Zhuang, Yue Shen, Marta Volonteri, Nianyi Chen, Tiziana Di Matteo   +5 more
doaj   +1 more source

The Gamma-Ray Luminosity Function of Flat-spectrum Radio Quasars

The Astrophysical Journal
We have utilized the largest sample of gamma-ray-selected Fermi flat-spectrum radio quasars (FSRQs) ever used (519 sources) to construct the luminosity function and its evolution through cosmic history. In addition to spanning large redshift (0 
Garima Rajguru, L. Marcotulli, M. Ajello, M. Di Mauro, M. Urry   +4 more
doaj   +1 more source

Coherence of Supermassive Black Hole Binary Demographics with the nHz Stochastic Gravitational-wave Background

The Astrophysical Journal
We present a refined estimation of the stochastic gravitational-wave background (SGWB) based on observed dual active galactic nuclei (AGNs) together with AGN X-ray luminosity functions, in light of recent Pulsar Timing Array (PTA) detections of an nHz ...
Katsunori Kusakabe, Yoshiyuki Inoue, Daisuke Toyouchi   +2 more
doaj   +1 more source

VODKA-JWST: A 3.8 kpc Dual Quasar at Cosmic Noon in a Powerful Starburst Galaxy with JWST/MIRI Integral Field Unit

The Astrophysical Journal
Dual quasars—two active supermassive black holes at galactic scales—represent crucial objects for studying the impact of galaxy mergers and quasar activity on the star formation rate (SFR) within their host galaxies, particularly at cosmic noon when SFR ...
Yu-Ching Chen, Yuzo Ishikawa, Nadia L. Zakamska, Xin Liu, Yue Shen, Hsiang-Chih Hwang, David Rupke, Andrey Vayner, Arran C. Gross, Weizhe Liu, Dominika Wylezalek, Sylvain Veilleux, Caroline Bertemes, Nadiia Diachenko, Swetha Sankar   +14 more
doaj   +1 more source

The Final SDSS High-Redshift Quasar Sample of 52 Quasars at z>5.7

, 2016
We present the discovery of nine quasars at $z\sim6$ identified in the Sloan Digital Sky Survey (SDSS) imaging data. This completes our survey of $z\sim6$ quasars in the SDSS footprint.
Banados, Eduardo, Becker, Robert H., Bian, Fuyan, Fan, Xiaohui, Farnsworth, Kara, Jiang, Linhua, McGreer, Ian D., Shen, Yue, Strauss, Michael A., Wang, Feige, Wang, Ran, Wang, Shu, White, Richard L., Wu, Jin, Wu, Xue-Bing, Yang, Jinyi, Yang, Qian   +16 more
core   +1 more source