Results 61 to 70 of about 1,904 (106)

BASS. XLVIII. [Ne V] λ3427 Emission in Powerful Nearby Active Galactic Nuclei

The Astrophysical Journal
We investigate the high-ionization, narrow [Ne V ] λ 3427 line emission in a sample of over 340 ultrahard X-ray (14–195 keV) selected active galactic nuclei (AGN) drawn from the BAT AGN Spectroscopic Survey project.
Tomer Reiss, Benny Trakhtenbrot, Claudio Ricci, Franz E. Bauer, Michael J. Koss, Kohei Ichikawa, Darshan Kakkad, Richard Mushotzky, Kyuseok Oh, Alessandro Peca, Rudolf Bär, Yaherlyn Diaz, Fiona Harrison, Meredith C. Powell, Eleonora Sani, Daniel Stern, C. Megan Urry   +16 more
doaj   +1 more source

Effects of superradiance in active galactic nuclei

Monthly Notices of the Royal Astronomical Society
ABSTRACT A supermassive black hole (SMBH) at the core of an active galactic nucleus (AGN) provides room for the elusive ultra-light scalar particles to be produced through a phenomenon called superradiance. This phenomenon produces a cloud of scalar particles around the black hole by draining its spin angular momentum.
Priyanka Sarmah, Himanshu Verma, Kingman Cheung, Joseph Silk   +3 more
openaire   +3 more sources

MATTER OUTFLOW FROM ACTIVE GALACTIC NUCLEI

Вестник. Серия физическая, 2008
Some problems of the theory of matter outflow from AGN in connection with the unification model of AGN are brifly discussed.
E.Y. Vilkoviskij
doaj  

BASS. LIII. The Eddington Ratio as the Primary Regulator of the Fraction of X-Ray Emission in Active Galactic Nuclei

The Astrophysical Journal
Active galactic nuclei (AGN) emit radiation via accretion across the entire energy spectrum. While the standard disk and corona model can somewhat describe this emission, it fails to predict specific features such as the soft X-ray excess, the short-term
Kriti Kamal Gupta, Claudio Ricci, Alessia Tortosa, Matthew J. Temple, Michael J. Koss, Benny Trakhtenbrot, Franz E. Bauer, Ezequiel Treister, Richard Mushotzky, Elias Kammoun, Iossif Papadakis, Kyuseok Oh, Alejandra Rojas, Chin-Shin Chang, Yaherlyn Diaz, Arghajit Jana, Darshan Kakkad, Ignacio del Moral-Castro, Alessandro Peca, Meredith C. Powell, Daniel Stern, C. Megan Urry, Fiona Harrison   +22 more
doaj   +1 more source

Optical Variability of Active Galactic Nuclei

Frontiers in Astronomy and Space Sciences, 2017
Szymon Kozłowski
doaj   +1 more source

Some of the next articles are maybe not open access.

Related searches:

Active Galactic Nuclei

2021
Almost all galaxies host in their center a supermassive black hole of mass between a million and tens of billions solar masses. Supermassive black holes grow in symbiosis with their host galaxies across the Hubble time, occasionally accreting surround matter, giving rise to an Active Galactic Nuclei (AGN).
openaire   +2 more sources

Active galactic nuclei

Reports on Progress in Physics, 1989
Recent observational and theoretical investigations of AGN are reviewed. The basic AGN characteristics (broad emission lines of abundant ions, X-ray emission, and a sharp starlike appearance) are summarized, and particular attention is given to the spectral classification of Seyfert galaxies, the AGN velocity fields and their measurement, low ...
openaire   +2 more sources

The Masses of Active Galactic Nuclei

Vistas in Astronomy, 1988
The study of the variability of the X-ray radiation in AGNs on time scales of 102 to 105sec is of fundamental importance for understanding the nature of their central source. Recently Wandel & Mushotzky [1] determined the masses of AGNs from their X-ray variability assuming the emitting region of X-rays to be five Schwarzschild radii.
openaire   +1 more source

Active Galactic Nuclei

2008
Fil: Cellone, Sergio Aldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas.
  +5 more sources

Active Galactic Nuclei

Astronomische Nachrichten, 2005
AbstractD01 Direct evidence of the receding ‘torus’ around active galactic nuclei of FRII radio galaxies and quasarsD02 Infrared emission from a clumpy and dusty torus around AGND03 Size and properties of AGN narrow–line regions from emission–line diagnosticsD04 Structural Variability of Intraday Variable SourcesD05 Stability of self‐gravitating ...
Martin Haas, Peter Biermann, Rolf Chini, Jochen Heidt, Wolfram Kollatschny, Helmut Meusinger, Ralf Siebenmorgen   +6 more
openaire   +1 more source