Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-01-29
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
24 pages, 6 figures, accepted by MNRAS
Scientific paper
The low-mass condensations (LMCs) have been observed within the molecular cloud cores. In this research, we investigate the effect of isobaric thermal instability (TI) applied for forming these LMCs. For this purpose, at first we investigate the occurrence of TI in the molecular clouds. Then, for studying the significance of linear isobaric TI, we use a contracting axisymmetric cylindrical core with axial magnetic field. Consideration to cooling and heating mechanisms in the molecular clouds shows that including the heating due to ambipolar diffusion can lead to the occurrence of TI in a time-scale smaller than dynamical time-scale. Application of linear perturbation analysis shows that isobaric TI can take place in outer region of the molecular cloud cores. Furthermore, the results showthat perturbations with wavelengths greater than few astronomical units are protected from destabilization property of thermal conduction, so they can grow to form LMCs. Thus, the results show that the mechanism of TI can be used to explain the formation of LMCs as the progenitors of collapsing proto-stellar entities, brown dwarfs, or proto-planets.
No associations
LandOfFree
Formation of low-mass condensations in the molecular cloud cores via thermal instability does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Formation of low-mass condensations in the molecular cloud cores via thermal instability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formation of low-mass condensations in the molecular cloud cores via thermal instability will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-573194