Results 1 to 10 of about 3,194 (153)
Proc Natl Acad Sci U S A, 1999 Active galactic nuclei are the most powerful, long-lived objects in the Universe. Recent data confirm the theoretical idea that the power source is accretion into a massive black hole. The common occurrence of obscuration and outflows probably means that the contribution of active galactic nuclei to the power density of the Universe has been ...
Fabian AC.
europepmc +6 more sources
Fuelling active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2007 Abstract We suggest that most nearby active galactic nuclei are fed by a series of small-scale, randomly oriented accretion events. Outside a certain radius these events promote rapid star formation, while within it they fuel the supermassive black hole. We show that the events have a characteristic time-evolution.
King, A. R., Pringle, J. E.
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Elusive active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 accepted for publication in MNRAS Letters, 6 pages, 3 figures, typos and references ...
R. Maiolino +10 more
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Evolution of Active Galactic Nuclei [PDF]
, 2013 [Abriged] Supermassive black holes (SMBH) lurk in the nuclei of most massive galaxies, perhaps in all of them. The tight observed scaling relations between SMBH masses and structural properties of their host spheroids likely indicate that the processes fostering the growth of both components are physically linked, despite the many orders of magnitude ...
Merloni, A., Heinz, S.
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Episodic Activity in Active Galactic Nuclei [PDF]
Proceedings of 25th Texas Symposium on Relativistic Astrophysics — PoS(Texas 2010), 2011 7 pages, 2 figues, 25th Texas Symposium, Heidelberg, Germany; http://pos.sissa.it/archive/conferences/123/014/Texas%202010_014 ...
Nandi, S. +3 more
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The Astrophysical Journal, 2023 “Changing-look active galactic nuclei” (CLAGNs) are known to change their apparent types between types 1 and 2, usually accompanied by a drastic change in their luminosity on timescales of years.
Hirofumi Noda +13 more
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Active galactic nuclei: what’s in a name? [PDF]
The Astronomy and Astrophysics Review, 2017 Accepted for publication in Astronomy & Astrophysics Review, 56 pages, 25 ...
P. Padovani +10 more
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THE EVOLUTION OF ACTIVE GALACTIC NUCLEI AND THEIR SPINS [PDF]
The Astrophysical Journal, 2013 ApJ, in ...
Volonteri, M. +3 more
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The Astrophysical Journal, 2023 We report on the 2019 XMM-Newton+NuSTAR monitoring campaign of the Seyfert galaxy NGC 2992, observed at one of its highest flux levels in the X-rays.
Alfredo Luminari +10 more
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Atoms, 2017 We present the first results of medium-band photometric observations on the 1m Schmidt Telescope of Byurakan Astrophysical Observatory (Armenia). The object sample was created in the SA68 field.
Sergey Kotov, Sergey Dodonov
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