Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..565g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 10, 1991, p. 565-575.
Astronomy and Astrophysics
Astrophysics
32
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
Scientific paper
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.
Gammie Charles F.
Jog Chanda J.
Ostriker Jeremiah P.
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