Formation of Small-Scale Condensations in the Molecular Clouds via Thermal Instability |
| |
| Authors: | Mohsen Nejad-Asghar Jamshid Ghanbari |
| |
| Institution: | (1) School of Physics, Damghan University of Basic Sciences, Damghan, Iran;(2) Department of Physics, Ferdowsi University, Mashhad, Iran |
| |
| Abstract: | A systematic study of the linear thermal instability of a self-gravitating magnetic molecular cloud is carried out for the
case when the unperturbed background is subject to local expansion or contraction. We consider the ambipolar diffusion, or
ion-neutral friction on the perturbed states. In this way, we obtain a non-dimensional characteristic equation that reduces
to the prior characteristic equation in the non-gravitating stationary background. By parametric manipulation of this characteristic
equation, we conclude that there are, not only oblate condensation forming solutions, but also prolate solutions according
to local expansion or contraction of the background. We obtain the conditions for existence of the Field lengths that thermal
instability in the molecular clouds can occur. If these conditions establish, small-scale condensations in the form of spherical,
oblate, or prolate shape may be produced via thermal instability. |
| |
| Keywords: | ISM: clouds ISM: molecules ISM: structure Instabilities Star: formation |
| 本文献已被 SpringerLink 等数据库收录！ |
|
