The velocity dispersion of giant molecular clouds. II - Mathematical and numerical refinements

Gammie, Charles F and Ostriker, Jeremiah P and Jog, Chanda J (1991) The velocity dispersion of giant molecular clouds. II - Mathematical and numerical refinements. In: Astrophysical Journal, 378 (2). pp. 565-575.

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Abstract

The energy input to giant molecular clouds is recalculated, using the proper linearized equations of motion, including the Coriolis force and allowing for changes in the guiding center. Perturbation theory yields a result in the limit of distant encounters and small initial epicyclic amplitudes. Direct integration of the motion equations allows the strong encounter regime to be studied. The present perturbation theory result differs by a factor of order unity from that of Jog and Ostriker (1988). The result of present numerical integrations for the 2D (planar) velocity dispersion is presented. The accretion rate for a molecular cloud in the Galactic disk is calculated.

Item Type:	Journal Article
Publication:	Astrophysical Journal
Publisher:	University of Chicago Press
Additional Information:	Copyright of this article belongs to University of Chicago Press.
Keywords:	Gravitational Effects;Milky Way Galaxy;Molecular Clouds; Nebulae;Perturbation Theory;Velocity Distribution;Angular Momentum;Coriolis Effect;Equations Of Motion;Interstellar Gas;Momentum Transfer;Numerical Integration.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Dec 2010 07:20
Last Modified:	07 Dec 2010 07:20
URI:	http://eprints.iisc.ac.in/id/eprint/34282

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