Results 21 to 30 of about 321 (187)
Accretion-driven turbulence as universal process: galaxies, molecular clouds, and protostellar disks [PDF]
Astronomy and Astrophysics, 2010 accepted version, 22 pages, 10 figures, Astronomy and Astrophysics in ...
Klessen, Ralf S., Hennebelle, Patrick
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Turbulent viscosity in clumpy accretion disks [PDF]
Astronomy & Astrophysics, 2003 15 pages with 10 figures.
Vollmer, B., Beckert, T.
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An accretion disk laboratory in the Seyfert 1.9 galaxy NGC 2992 [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractOver twenty five years of X-ray observations of the Seyfert 1.9 galaxy NGC 2992 show that it is a promising test-bed for severely constraining accretion disk models. The previous interpretation of the historical activity of NGC 2992 in terms of the accretion disk slowly becoming dormant over many years and then ‘re-building’ itself is not ...
Tahir Yaqoob +2 more
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New evidence for halo gas accretion onto disk galaxies [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractStudies of the halo gas in the Milky Way and in nearby spiral galaxies show the presence of gas complexes that cannot be reconciled with an internal (galactic fountain) origin and are direct evidence of gas accretion. Estimating gas accretion rates from these features consistently gives values, which are one order of magnitude lower than what ...
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How surface density of galaxy disks affects metallicity? Outflow and Accretion [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractIn this study, we examine the effect of surface density of disks on chemical evolution of galaxies. We find that, higher surface brightness galaxies on average possess higher gas-phase metallicity compared to lower surface brightness galaxies with the same stellar and gas mass.
Po-Feng Wu +3 more
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Universe, 2021 Double-spiral galaxies are common in the Universe. It is known that the logarithmic double spiral is a Maximum Entropy geometry in hyperbolic (flat) spacetime that well represents an idealised spiral galaxy, with its central supermassive black hole (SMBH)
Michael C. Parker, Chris Jeynes
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ACCRETION-DRIVEN TURBULENCE AND THE TRANSITION TO GLOBAL INSTABILITY IN YOUNG GALAXY DISKS [PDF]
The Astrophysical Journal, 2010 ApJ vol.
Elmegreen, Bruce G., Burkert, Andreas
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Influence of Black Hole Spin on the Shape of the Fe Kα Spectral Line: The Case of 3C 405
Open Astronomy, 2011 Here we analyze how the angular momenta (spins) of black holes in the centers of Active Galactic Nuclei (AGN) affect the shape of the FeK line emitted from their accretion disks.
Jovanović P. +2 more
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The Astrophysical Journal, 2023 We perform 3D radiation hydrodynamic local shearing-box simulations to study the outcome of gravitational instability (GI) in optically thick active galactic nuclei (AGNs) accretion disks.
Yi-Xian Chen +3 more
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UNSTABLE DISKS AT HIGH REDSHIFT: EVIDENCE FOR SMOOTH ACCRETION IN GALAXY FORMATION
The Astrophysical Journal, 2009 ApJ Letters ...
Bournaud, Frederic, Elmegreen, Bruce G.
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