Results 11 to 20 of about 74,488 (217)
Fuelling Active Galactic Nuclei [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2007 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.
King, A. R., Pringle, J. E.
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On the Unification of Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2012 The inevitable spread in properties of the toroidal obscuration of active galactic nuclei (AGNs) invalidates the widespread notion that type 1 and 2 AGNs are intrinsically the same objects, drawn randomly from the distribution of torus covering factors ...
Alonso-Herrero +19 more
core +5 more sources
, 2010 This work represents the final year project for BSc Physics with Astrophysics degree and it mainly focuses on empirical investigation of the photometry of quasars in the Sloan Digital Sky Survey (SDSS) and the UK Infrared Telescope (UKIRT) Infrared Sky ...
Khassen, Yerbol Farkhatuly
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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
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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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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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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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.
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The Astrophysical Journal Supplement Series, 2022 We present the BAT AGN Spectroscopic Survey (BASS) Near-infrared Data Release 2 (DR2), a study of 168 nearby ( $\bar{z}=0.04$ , z < 0.6) active galactic nuclei (AGN) from the all-sky Swift Burst Array Telescope X-ray survey observed with the Very Large ...
Jakob S. den Brok +22 more
doaj +1 more source
The parsec scale region of Active Galactic Nuclei in the IR [PDF]
, 2004 First results from the AGN-Heidelberg program aimed at spatially resolving the central pc region of the closest Active Galactic Nuclei are presented. The core region of prototype active nuclei are clearly unveiled at IR waves and at distances from the ...
Meisenheimer, Klaus, Prieto, M. Almudena
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