Results 181 to 190 of about 238,671 (290)

Dormancy and Reawakening over Years: Eight New Recurrent Changing-look AGNs

The Astrophysical Journal
We report the discovery of eight new recurrent changing-look (CL) active galactic nuclei (AGNs), consisting of seven rebrightening turn-off AGNs and one fading turn-on AGN.
Shu Wang, Jong-Hak Woo, Elena Gallo, Donghoon Son, Qian Yang, Junjie Jin, Hengxiao Guo, Minzhi Kong   +7 more
doaj   +1 more source

Low-ionization active galactic nuclei - X-ray or shock heated?

, 1983
J. P. Halpern, J. E. Steiner
openalex   +1 more source

Profiles of emission lines in active galactic nuclei - III. Observations of Ha, [N II] and [S II] profiles [PDF]

, 1990
I. Busko, J. E. Steiner
openalex   +1 more source

Galactic-scale Emission-line Outflow from the Radio-loud Quasar 3C 191

The Astrophysical Journal Supplement Series
Quasar feedback is routinely invoked as an indispensable ingredient in galaxy formation models. Galactic outflows are a crucial agent of quasar feedback that frequently manifest themselves in absorption and emission lines.
Qinyuan Zhao, Luming Sun, Lu Shen, Guilin Liu, Junfeng Wang, Mayank Sharma, Nahum Arav, Yulong Gao, Chris Benn   +8 more
doaj   +1 more source

Evolution of self-gravitating accretion disks in active galactic nuclei

, 1989
Isaac Shlosman, Mitchell C. Begelman
openalex   +1 more source

X-Ray Spectra and Time Variability of Active Galactic Nuclei [PDF]

, 1993
R. F Mushotzky
openalex   +1 more source

Reverberation Mapping of Lamppost and Wind Structures in Accretion Thin Disks

The Astrophysical Journal
To address the discrepancy where disk sizes exceed those predicted by standard models, we explore two extensions to disk size estimates within the UV/optical wavelength range: disk winds and color correction.
James Hung-Hsu Chan, Joshua Fagin, Henry Best, Matthew J. O’Dowd   +3 more
doaj   +1 more source

Hydrogen Column Density Variability in a Sample of Local Compton-thin AGN II

The Astrophysical Journal
We present the multiepoch analysis of 13 variable, nearby ( z ≲ 0.1), and Compton-thin (10 ^22 < N _H < 1.5 × 10 ^24 cm ^−2 ) active galactic nuclei (AGN) selected from the 105-month BAT catalog.
A. Pizzetti, N. Torres-Albà, S. Marchesi, J. Buchner, I. Cox, X. Zhao, S. Neal, D. Sengupta, R. Silver, M. Ajello   +9 more
doaj   +1 more source

The radiative deceleration of ultrarelativistic jets in active galactic nuclei

, 1989
Fulvio Melia, Arieh Königl
openalex   +1 more source

Stripe 82-XL: The ∼54.8 deg2 and ∼18.8 Ms Chandra and XMM-Newton Point-source Catalog and Number of Counts

The Astrophysical Journal
We present an enhanced version of the publicly available Stripe 82X catalog (S82-XL), featuring a comprehensive set of 22,737 unique X-ray point sources identified with a significance ≳4 σ .
Alessandro Peca, Nico Cappelluti, Stephanie LaMassa, C. Megan Urry, Massimo Moscetti, Stefano Marchesi, David Sanders, Connor Auge, Aritra Ghosh, Tonima Tasnim Ananna, Núria Torres-Albà, Ezequiel Treister   +11 more
doaj   +1 more source