Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Formation of low-mass condensations in the molecular cloud cores via
  thermal instability   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.

22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th