The velocity dispersion of giant molecular clouds. II - Mathematical and numerical refinements
The velocity dispersion of giant molecular clouds. II - Mathematical and numerical refinements
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巨型分子云的速度色散。
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
C. Jog
中科院分区：
文献类型：
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作者：
C. Gammie;J. Ostriker;C. Jog
使用适当的线性化运动方程，包括科里奥利力，并考虑到引导中心的变化，重新计算了输入到巨型分子云的能量。微扰理论产生了远距离相遇的极限和较小的初始周转振幅。运动方程的直接积分允许研究强相遇区域。本文的微扰理论结果与JOG和Ostriker(1988)的结果相差一个数量级。给出了二维(平面)速度弥散的数值积分结果。计算了分子云在银盘中的吸积率。
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.