Results 101 to 110 of about 80,128 (249)

A NEW NETWORK FOR HIGHER-TEMPERATURE GAS-PHASE CHEMISTRY. I. A PRELIMINARY STUDY OF ACCRETION DISKS IN ACTIVE GALACTIC NUCLEI [PDF]

, 2010
Nanase Harada, Eric Herbst, Valentine Wakelam   +2 more
openalex   +1 more source

VARIABILITY OF ACTIVE GALACTIC NUCLEI [PDF]

, 2001
Continuum and emission-line variability of active galactic nuclei provides a powerful probe of microarcsecond scale structures in the central regions of these sources. In this contribution, we review basic concepts and methodologies used in analyzing AGN variability.
openaire   +2 more sources

Gamma rays from active galactic nuclei [PDF]

The general properties of Active Galactic Nuclei (AGN) and quasars are reviewed with emphasis on their continuum spectral emission. Two general classes of models for the continuum are outlined and critically reviewed in view of the impending GRO (Gamma ...
Kazanas, Demosthenes
core   +1 more source

SPECTRAL ENERGY DISTRIBUTIONS OF TYPE 1 ACTIVE GALACTIC NUCLEI IN THE COSMOS SURVEY. I. THEXMM-COSMOS SAMPLE [PDF]

, 2012
M. Elvis, Heng Hao, F. Civano, M. Brusa, M. Salvato, A. Bongiorno, P. Capak, G. Zamorani, A. Comastri, K. Jahnkę, Elisabeta Lusso, V. Mainieri, Jonathan R. Trump, Luis C. Ho, I Tereno, N. Cappelluti, Mauricio Cisternas, D. Frayer, R. Gilli, G. Hasinger, J. P. Huchra, C. D. Impey, Anton M. Koekemoer, G. Lanzuisi, E. Le Floc’h, S. J. Lilly, Yang Liu, P. J. McCarthy, H. J. McCracken, A. Merloni, H. J. Roeser, D. B. Sanders, M. Sargent, N. Z. Scoville, Eva Schinnerer, David Schiminovich, J. Silverman, Y. Taniguchi, C. Vignali, C. M. Urry, Michel Zamojski, M. Zatloukal   +41 more
openalex   +1 more source

On the Properties of X-Ray Corona in Seyfert 1 Galaxies

The Astrophysical Journal
We carried out a uniform and systematic analysis of a sample of 112 nearby bright Seyfert 1 type active galactic nuclei, the observations of which were carried out by the Nuclear Spectroscopic Telescope Array between 2013 August and 2022 May.
Indrani Pal, Anju A., H. Sreehari, Gitika Rameshan, C. S. Stalin, Claudio Ricci, S. Marchesi   +6 more
doaj   +1 more source

A PHYSICAL LINK BETWEEN JET FORMATION AND HOT PLASMA IN ACTIVE GALACTIC NUCLEI [PDF]

, 2013
Qingwen Wu, Xinwu Cao, Luis C. Ho, Ding-Xiong Wang   +3 more
openalex   +1 more source

The Active Galactic Nuclei in the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). II. Luminosity Function [PDF]

, 2022
Chenxu Liu, Karl Gebhardt, Erin Mentuch Cooper, Yechi Zhang, Donald P. Schneider, Robin Ciardullo, Dustin Davis, Daniel J. Farrow, Steven L. Finkelstein, C. Gronwall, Gary J. Hill, Lindsay R. House, Donghui Jeong, W. Kollatschny, Maja Lujan Niemeyer, Sarah Tuttle   +15 more
openalex   +1 more source

The environments of active galactic nuclei at 3.6 μm [PDF]

, 2010
J. T. Falder, J. A. Stevens, M. J. Jarvis, M. J. Hardcastle, Mark Lacy, R. J. McLure, E. Hatziminaoglou, M. J. Page, Gordon T. Richards   +8 more
openalex   +1 more source

X-Ray Polarization Variability of High Spectral Peak BL Lacertaes: Cases of 1ES 1959+650 and PKS 2155–304

The Astrophysical Journal Letters
The high-energy-peaked BL Lacertae objects (HBLs) are the main targets of the Imaging X-ray Polarimetry Explorer (IXPE) for investigating the mechanisms of radiation and particle acceleration in jets. In this Letter, we report the first IXPE observations
Xin-Ke Hu, Yu-Wei Yu, Jin Zhang, Tan-Zheng Wu, Ji-Shun Lian, Xiang-Gao Wang, Hai-Ming Zhang, En-Wei Liang   +7 more
doaj   +1 more source

On the two states of CYG X-1 and related sources [PDF]

A model for active galactic nuclei (AGN), employing quasi-spherical accretion onto a black hole, when scaled down to solar mass objects, provides a straightforward account of the bimodal spectral behavior of Cyg X-1 and the other galactic black hole ...
Kazanas, D.
core   +1 more source