Results 11 to 20 of about 321 (187)
The Reliability of Accretion Disk Inclination Derived from X-Ray Spectroscopy of Active Galaxies
The Astrophysical JournalThe inclination angle of substructures in active galaxies gives insights into physical components from scales of the vicinity of the central black hole to the entire host galaxy. We use the self-consistent reflection spectral model RELXILL to measure the
Rong Du +3 more
doaj +4 more sources
SHRINKING GALAXY DISKS WITH FOUNTAIN-DRIVEN ACCRETION FROM THE HALO [PDF]
The Astrophysical Journal, 2014 Star formation in most galaxies requires cosmic gas accretion because the gas consumption time is short compared to the Hubble time. This accretion presumably comes from a combination of infalling satellite debris, cold flows, and condensation of hot halo gas at the cool disk interface, perhaps aided by a galactic fountain.
Elmegreen, Bruce G. +2 more
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Turbulent viscosity in clumpy accretion disks [PDF]
Astronomy & Astrophysics, 2002 The equilibrium state of a turbulent clumpy gas disk is analytically investigated. The disk consists of distinct self-gravitating clouds. Gravitational cloud-cloud interactions transfer energy over spatial scales and produce a viscosity, which allows mass accretion in the gas disk.
Vollmer, B., Beckert, T.
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Accretion disk versus jet orientation in H2O megamaser galaxies [PDF]
Astronomy & Astrophysics, 2019 Context. An essential part of the paradigm describing active galactic nuclei is the alignment between the radio jet and the associated rotation axis of the sub-pc accretion disks. Because of the small linear and angular scales involved, this alignment has not yet been checked in a sufficient number of low luminosity active galactic nuclei (LLAGNs ...
Kamali, F. +12 more
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Gas accretion from the cosmic web feeding disk galaxies [PDF]
Proceedings of the International Astronomical Union, 2016 AbstractDisk galaxies in cosmological numerical simulations grow by accreting gas from the cosmic web. This gas reaches the external disk, and then spirals in dragged along by tidal forces and/or disk instabilities. The importance of gas infall is as clear from numerical simulations as it is obscure to observations.
J. Sánchez Almeida +7 more
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Star formation and accretion in the circumnuclear disks of active galaxies [PDF]
Astronomy & Astrophysics, 2013 13 pages, 15 figures, 6 tables, accepted at A& ...
Wutschik, S. +2 more
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The Relative Orientation of Nuclear Accretion and Galaxy Stellar Disks in Seyfert Galaxies [PDF]
The Astrophysical Journal, 1999 We use the difference (delta) between the position angles of the nuclear radio emission and the host galaxy major axis to investigate the distribution of the angle (beta) between the axes of the nuclear accretion disk and the host galaxy disk in Seyfert galaxies. We provide a critical appraisal of the quality of all measurements, and find that the data
Nagar, Neil M., Wilson, Andrew S.
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NGC 5084: A Massive Disk Galaxy Accreting its Satellites?
The Astronomical Journal, 1997 The spectra of 34 galaxies within 20 arcmins (\sim 100 kpc) of the lenticular galaxy NGC 5084 have been obtained using the FOCAP system on the Anglo-Australian 3.9m telescope. Nine objects are found with projected separations \lesssim 80 kpc and with radial velocities within \pm 630 km/s of the parent galaxy redshift.
Carignan, Claude +3 more
openaire +2 more sources
Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies [PDF]
The Astrophysical Journal, 2018 Abstract We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four months, with median cadences of 1.0 and 0.6 days for MCG+08-11-011 and NGC 2617, respectively, combined with ...
M. M. Fausnaugh +71 more
openaire +6 more sources
CONNECTION BETWEEN THE ACCRETION DISK AND JET IN THE RADIO GALAXY 3C 111 [PDF]
The Astrophysical Journal, 2011 We present the results of extensive multi-frequency monitoring of the radio galaxy 3C 111 between 2004 and 2010 at X-ray (2.4--10 keV), optical (R band), and radio (14.5, 37, and 230 GHz) wave bands, as well as multi-epoch imaging with the Very Long Baseline Array (VLBA) at 43 GHz.
Chatterjee, Ritaban +15 more
openaire +5 more sources