Results 41 to 50 of about 122,679 (291)

ON THE UNIFICATION OF ACTIVE GALACTIC NUCLEI [PDF]

The Astrophysical Journal, 2012
ApJ Letters, to be published.
openaire   +3 more sources

JETTED ACTIVE GALACTIC NUCLEI [PDF]

International Journal of Modern Physics: Conference Series, 2012
Most of the electromagnetic output of blazars (BL Lac objects and Flat Spectrum Radio Quasars) comes out in the γ–ray band, making the Large Area Telescope [0.1–100 GeV] onboard the Fermi satellite and the Cherenkov telescopes crucial for gather crucial data and thus to understand their physics.
openaire   +3 more sources

Active Galactic Nuclei

, 2013
Apresentação realizada como parte da avaliação da disciplina "Introdução a Astrofísica Extragaláctica" (2013)
  +6 more sources

Supermassive Black Holes in Active Galactic Nuclei [PDF]

, 2000
This article gives a brief overview of the direct and indirect evidence in support of the standard paradigm that active galactic nuclei are powered by supermassive black holes.Comment: A review to appear in The Encyclopedia of Astronomy and Astrophysics
Ho, Luis C., Kormendy, John
core   +3 more sources

The Messy Nature of Fiber Spectra: Star–Quasar Pairs Masquerading as Dual Type 1 AGNs

The Astrophysical Journal, 2023
Theoretical studies predict that the most significant growth of supermassive black holes (SMBHs) occurs in late-stage mergers, coinciding with the manifestation of dual active galactic nuclei (AGNs), and both major and minor mergers are expected to be ...
Ryan W. Pfeifle, Barry Rothberg, Kimberly A. Weaver, Remington O. Sexton, Jenna M. Cann, Nathan J. Secrest, Michael A. Reefe, Thomas Bohn   +7 more
doaj   +1 more source

Radiation-Driven Outflows in Active Galactic Nuclei [PDF]

, 2009
We review the results from multi-dimensional, time-dependent simulations of gas dynamics in AGN. We will focus on two types of outflows powered by radiation emitted from the AGN central engine: (i) outflows driven from the innermost part of an accretion ...
Daniel Proga, Ivan Hubeny, James M. Stone, Keith MacGregor, Klaus Werner, Ryuichi Kurosawa   +5 more
core   +2 more sources

Active galactic nuclei at gamma-ray energies [PDF]

, 2016
Active Galactic Nuclei can be copious extragalactic emitters of MeV-GeV-TeV gamma rays, a phenomenon linked to the presence of relativistic jets powered by a super-massive black hole in the center of the host galaxy.
Dermer, Charles Dennison, Giebels, Berrie   +1 more
core   +3 more sources

New Spectral Model for Constraining Torus Covering Factors from Broadband X-Ray Spectra of Active Galactic Nuclei [PDF]

, 2018
The basic unified model of active galactic nuclei (AGNs) invokes an anisotropic obscuring structure, usually referred to as a torus, to explain AGN obscuration as an angle-dependent effect.
M. Baloković, M. Baloković, M. Brightman, F. Harrison, A. Comastri, C. Ricci, C. Ricci, C. Ricci, J. Buchner, J. Buchner, P. Gandhi, D. Farrah, D. Stern   +12 more
semanticscholar   +1 more source

Little Red Dots: An Abundant Population of Faint Active Galactic Nuclei at z ∼ 5 Revealed by the EIGER and FRESCO JWST Surveys

Astrophysical Journal
Characterizing the prevalence and properties of faint active galactic nuclei (AGNs) in the early Universe is key for understanding the formation of supermassive black holes (SMBHs) and determining their role in cosmic reionization.
J. Matthee, R. Naidu, G. Brammer, J. Chisholm, A. Eilers, A. Goulding, J. Greene, D. Kashino, I. Labbé, S. Lilly, R. Mackenzie, P. Oesch, A. Weibel, S. Wuyts, M. Xiao, R. Bordoloi, R. Bouwens, P. V. van Dokkum, G. Illingworth, I. Kramarenko, M. Maseda, C. Mason, R. Meyer, E. Nelson, N. Reddy, I. Shivaei, R. Simcoe, M. Yue   +27 more
semanticscholar   +1 more source

Broad iron lines in Active Galactic Nuclei [PDF]

, 2000
An intrinsically narrow line emitted by an accretion disk around a black hole appears broadened and skewed as a result of the Doppler effect and gravitational redshift.
A. J. Young, Antonucci R., C. S. Reynolds, Dabrowski Y., Fabian A. C., Fabian A. C., Fanton C., George I. M., Ghisellini G., Gierlinski M., Grandi P., Guainazzi M., Guainazzi M., Guilbert P. W., Iwasawa K., Iwasawa K., K. Iwasawa, Kormendy J., Makishima K., Martocchia A., Matt G., Matt G., Matt G., Matt G., Mushotzky R. F., Nandra K., Nandra K., Nishiura S., Otani C., Revnivtsev M., Reynolds C. S., Reynolds C. S., Reynolds C. S., Ross R. R., Ross R. R., Shakura N. L., Vainshtein L. A., Zdziarski A. A.,  A. C. Fabian   +38 more
core   +3 more sources