Two-dimensional hydrodynamic simulations of convection in radiation-dominated accretion disks

Eric Agol, Julian Krolik, Neal J. Turner, James M. Stone

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The standard equilibrium for radiation-dominated accretion disks has long been known to be viscously, thermally, and convectively unstable, but the nonlinear development of these instabilities - and hence the actual state of such disks - has not yet been identified. By performing local two-dimensional hydrodynamic simulations of disks, we demonstrate that convective motions can release heat sufficiently rapidly as to substantially alter the vertical structure of the disks. If the dissipation rate within a vertical column is proportional to its mass, the disk settles into a new configuration that is thinner than the standard radiation-supported equilibrium by a factor of 2. If, on the other hand, the vertically integrated dissipation rate is proportional to the vertically integrated total pressure, the disk is subject to the well-known thermal instability. Convection, however, biases the development of this instability toward collapse. The end result of such a collapse is a gas-pressure-dominated equilibrium at the original column density.

Original languageEnglish (US)
Pages (from-to)543-552
Number of pages10
JournalAstrophysical Journal
Volume558
Issue number2 PART 1
DOIs
StatePublished - Sep 10 2001

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Accretion, accretion disks
  • Convection
  • Hydrodynamics

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