Virial theorem for radiating accretion discs

Details Virial theorem for radiating accretion discs Virial theorem for radiating accretion discs

2011-11-21

arxiv.org/abs/1111.4891v2

Mon. Not. R. Astron. Soc., 422, 772 (2012)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Corrections according to the version published in MNRAS

Scientific paper

10.1111/j.1365-2966.2012.20658.x

A continuum version of the virial theorem is derived for a radiating self-gravitating accretion disc around a compact object. The central object is point-like, but we can avoid the regularization of its gravitational potential. This is achieved by applying a modified Pohozaev-Rellich identity to the gravitational potential of the disk only. The theorem holds for general stationary configurations, including discontinuous flows (shock waves, contact discontinuities). It is used to test numerical solutions of a model of self-gravitating radiative accretion discs. The presented virial theorem should be useful in the analysis of those (possibly radiating) hydrodynamical systems in astrophysics where the central mass and the mass of the fluid are comparable and none of them can be neglected.

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