Results 171 to 180 of about 261,296 (275)

Testing The Lamp-Post and Wind Reverberation Models with XMM-Newton Observations of NGC 5506. [PDF]

Astrophys J, 2020
Zoghbi A, Kalli S, Miller JM, Mizumoto M.   +3 more
europepmc   +1 more source

XMM-NEWTONOBSERVATIONS OF A COMPLETE SAMPLE OF OPTICALLY SELECTED TYPE 2 SEYFERT GALAXIES [PDF]

, 2009
Stephanie LaMassa, Timothy M. Heckman, A. Ptak, A. E. Hornschemeier, Lucimara P. Martins, Paule Sonnentrucker, Christy Tremonti   +6 more
openalex   +1 more source

The NuSTAR Local AGN N H Distribution Survey (NuLANDS). I. Toward a Truly Representative Column Density Distribution in the Local Universe

The Astrophysical Journal
Hard X-ray-selected samples of active galactic nuclei (AGN) provide one of the cleanest views of supermassive black hole accretion but are biased against objects obscured by Compton-thick gas column densities of N _H > 10 ^24 cm ^−2 .
Peter G. Boorman, Poshak Gandhi, Johannes Buchner, Daniel Stern, Claudio Ricci, Mislav Baloković, Daniel Asmus, Fiona A. Harrison, Jiří Svoboda, Claire Greenwell, Michael J. Koss, David M. Alexander, Adlyka Annuar, Franz E. Bauer, William N. Brandt, Murray Brightman, Francesca Civano, Chien-Ting J. Chen, Duncan Farrah, Karl Forster, Brian Grefenstette, Sebastian F. Hönig, Adam B. Hill, Elias Kammoun, George Lansbury, Lauranne Lanz, Stephanie LaMassa, Kristin Madsen, Stefano Marchesi, Matthew Middleton, Beatriz Mingo, Michael L. Parker, Ezequiel Treister, Yoshihiro Ueda, C. Megan Urry, Luca Zappacosta   +35 more
doaj   +1 more source

Variable Nature of Magnetically-Driven Ultra-Fast Outflows. [PDF]

Astrophys J Lett, 2018
Fukumura K, Kazanas D, Shrader C, Behar E, Tombesi F, Contopoulos I.   +5 more
europepmc   +1 more source

AGN STORM 2. VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations

The Astrophysical Journal
We observed the Seyfert 1 galaxy Mrk 817 during an intensive multiwavelength reverberation mapping campaign for 16 months. Here, we examine the behavior of narrow UV absorption lines seen in the Hubble Space Telescope/Cosmic Origins Spectrograph spectra,
Maryam Dehghanian, Nahum Arav, Gerard A. Kriss, Missagh Mehdipour, Doyee Byun, Gwen Walker, Mayank Sharma, Aaron J. Barth, Misty C. Bentz, Benjamin D. Boizelle, Michael S. Brotherton, Edward M. Cackett, Elena Dalla Bontà, Gisella De Rosa, Gary J. Ferland, Carina Fian, Alexei V. Filippenko, Jonathan Gelbord, Michael R. Goad, Keith Horne, Yasaman Homayouni, Dragana Ilić, Michael D. Joner, Erin A. Kara, Shai Kaspi, Christopher S. Kochanek, Kirk T. Korista, Peter Kosec, Andjelka B. Kovačević, Hermine Landt, Collin Lewin, Ethan R. Partington, Luka Č. Popović, Daniel Proga, Daniele Rogantini, Matthew R. Siebert, Thaisa Storchi-Bergmann, Marianne Vestergaard, Timothy. Waters, Jian-Min Wang, Fatima Zaidouni, Ying Zu   +41 more
doaj   +1 more source

Extragalactic radio surveys in the pre-Square Kilometre Array era. [PDF]

R Soc Open Sci, 2017
Simpson C.
europepmc   +1 more source

Balmer decrements in Seyfert 2 galaxies [PDF]

, 1990
L. Binette, A. C. Raga, Nuria Calvet, J. Cantó   +3 more
openalex   +1 more source

Discovery of a very Lyman-α-luminous quasar at z = 6.62. [PDF]

Sci Rep, 2017
Koptelova E, Hwang CY, Yu PC, Chen WP, Guo JK.   +4 more
europepmc   +1 more source

The black hole masses of Seyfert galaxies and quasars [PDF]

, 2001
R. J. McLure, J. S. Dunlop
openalex   +1 more source

GINGA observations of the X-ray spectra of Seyfert galaxies.

, 1994
K. Nandra, K. Pounds
semanticscholar   +1 more source