On the Level of Equilibrium Noises in a Gravitating Disk

Details On the Level of Equilibrium Noises in a Gravitating Disk On the Level of Equilibrium Noises in a Gravitating Disk

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983azh....60..466m&link_type=abstract

Astronomicheskii Zhurnal, Vol. 60, P. 466, 1983

Astronomy and Astrophysics

Astronomy

3

Scientific paper

A theory for determining the level of equilibrium fluctuations in flat gravitating systems is constructed. The thermodynamic noises have a scale of order of free pathlength of the disk's "macroparticles" l and an intensity α = (>δσ2/σ02<)1/2 ≈ (m/σ0)1/2/l, where m is the mass of "macroparticles " and σ0 is the surface density of the disk. The "gravitating-rotating" noises have an intensity smaller by a factor of (ρ/l)1/2 than the thermodynamic ones (ρ is the epicyclic radius), but their scale is of order of the Jeans wavelength. The intensities and scales of the noises are estimated for the gaseous subsystem of the Galaxy at solar vicinity and for Saturn's rings.

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