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Magnetogravitational instability in strongly coupled rotating clumpy molecular clouds including heating and cooling functions
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Magnetogravitational instability in strongly coupled rotating clumpy molecular clouds including heating and cooling functions
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Journal Article
Magnetogravitational instability in strongly coupled rotating clumpy molecular clouds including heating and cooling functions
2023
Overview
Molecular cloud (MC) formation is caused by the gravitational collapse mechanism and is significantly affected by radiative heating and cooling processes. This paper analyzes the gravitational instability in strongly coupled clumpy molecular clouds (MCs), under the effects of uniform rotation, magnetic field, and heat-loss functions. The generalized hydrodynamic equations coupled with the modified energy equation (which incorporates the heating and cooling effects due to cloud-cloud collisions) are used to describe the mathematical model. Following Jeans stability analysis, it is found that the value of the critical Jeans wavenumber decreases due to the strong coupling between the plasma particles (coupling parameter) and clump stirring processes (heating rate), so both have a stabilizing influence on the onset of gravitational collapse in clumpy MCs. The influence of various parameters on the growth rate of the instability is discussed numerically, and it is found that the cooling rate parameter that describes cloud-cloud collisions shows a destabilizing effect. The region of instability is observed to be smaller in the strongly coupled clumps (kinetic limit) than in the weakly coupled (hydrodynamic limit) clumps. The results are helpful in understanding the role of heating and cooling mechanisms in the MC formation.
