Results 141 to 150 of about 55,785 (258)
The role of cold flows in the assembly of galaxy disks [PDF]
, 2009 We use high-resolution cosmological hydrodynamical simulations to demonstrate that cold flow gas accretion, particularly along filaments, modifies the standard picture of gas accretion and cooling onto galaxy disks.
Brooks, A. M. +4 more
core
Can supermassive black hole seeds form in galaxy mergers [PDF]
, 2013 It has been recently suggested that supermassive black holes at z ≈ 5 −6 mightform from super-fast (M˙ >∼ 10 4 M ⊙ yr −1 ) accretion occurring in unstable, massive nu-clear gas disks produced by mergers of Milky–Way size galaxies.
A. Ferrara, F. Haardt, R. Salvaterra
semanticscholar +1 more source
Ultraluminous X-ray sources as super-Eddington accretion disks
, 2020 Copyright © 2018 by the Editors.All rights reserved. The origin of Ultraluminous X-ray sources (ULXs) in external galaxies whose X-ray luminosities exceed those of the brightest black holes in our Galaxy by hundreds and thousands of times is mysterious ...
core
Starving Accretion Disks in the Center of Galaxies: the Examples of Sgr A* and M31
, 1994 The low accretion rate inferred for the GC source Sgr A* requires a distinct type of accretion disk -- a starving disk. We investigate the structure of this type of disk within the framework of thin Keplerian disk models taking into account relativistic effects, detailed opacitiy tables and turbulent heat transport.
Falcke, H., Heinrich, O. M.
openaire +2 more sources
Radiative Cooling and Viscous Dissipation in Molecular Accretion Disks at the Nuclei of Galaxies
The Astrophysical Journal, 1998 Key processes are examined in the heating and cooling of molecular gas with emphasis on environments for water masers at the nuclei of galaxies. The exchange of infrared radiation between the gas and dust grains is evaluated in determining the cooling of the gas and in determining the thermal coupling between the gas and the dust grains.
S. J. Desch, B. K. Wallin, W. D. Watson
openaire +1 more source
Formation and evolution of galaxy disks
, 2008 These are the proceedings of the international conference “Formation and Evolution of Galaxy Disks” organized by the Specola Vaticana (the Vatican Observatory). The meeting hosted 198 participants from 26 countries.
Funes, J. G., Corsini, ENRICO MARIA
core
The Astrophysical JournalMagnetically arrested disks (MADs) have attracted much attention in recent years. The formation of MADs is usually attributed to the accumulation of a sufficient amount of dynamically significant poloidal magnetic flux.
Jia-Wen Li, Xinwu Cao
doaj +1 more source
Insights from Analytical Theory of Eccentric Circumbinary Disks
The Astrophysical JournalEccentric cavities in circumbinary disks precess on timescales much longer than the binary orbital period. These long-lived steady states can be understood as trapped modes in an effective potential primarily determined by the binary quadrupole and the ...
Marcela Grcić +2 more
doaj +1 more source
Gas Evolution in Disk Galaxies : Disk Stability, Gas Accretion & The Impacts of Spiral Density Waves [PDF]
, 2010 Diese Arbeit untersucht viele Aspekte der zeitlichen Entwicklung von Gas in Scheibengalaxien. Eine einfache und effektive Methode zur Initialisierung einer dreidimensionalen Gasscheibe in detailliertem Gleichgewicht wurde entwickelt. Mithilfe dieser Methode untersuchen wir theoretische Vorhersagen über Stabilität und 'Swing' Verstärkung ...
openaire +1 more source
COLD DARK MATTER SUBSTRUCTURE AND GALACTIC DISKS. II. DYNAMICAL EFFECTS OF HIERARCHICAL SATELLITE ACCRETION [PDF]
, 2009 We perform a set of fully self-consistent, dissipationless N-body simulations to elucidate the dynamical response of thin galactic disks to bombardment by cold dark matter (CDM) substructure.
Kazantzidis, Stelios +4 more
core +1 more source