Effect of radiative cooling on molecular cloud collapse

被引:20
作者
Pandey, BP [1 ]
Krishan, V
机构
[1] Katholieke Univ Leuven, Ctr Plasma Astrophys, B-3001 Heverlee, Belgium
[2] Indian Inst Astrophys, Bangalore 560034, Karnataka, India
关键词
Jeans instability; molecular clouds; radiative cooling;
D O I
10.1109/27.923714
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The effect of the radiative cooling of electrons on the gravitational collapse of molecular clouds consisting of neutral particles along with electrons, ions, and electrically charged dust grains with fluctuating charge is investigated. We include the effect of radiation on the gravitational collapse of the neutrals only through the ion-neutral and grain-neutral collisions. In the absence of thermal conduction, the radiative condensational instability may couple with the Jeans mode in the long-wavelength regime. However, when the thermal conduction is switched on, gravitational collapse Is not altered in any significant way by the radiative mode. The charge fluctuations on the grains may slightly reduce the Jeans growth rate as the collision induced plasma electric field, which is in phase with the gravitational field, is slightly reduced by the charge variation on the grains.
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页码:307 / 312
页数:6
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