Impacts of neutral collisions and finite electron inertia on longitudinal thermal instability of two-component radiative plasma for star formation in interstellar medium (ISM)

Abstract

The impact of neutral friction, finite electron inertia and radiative heat-loss function on the thermal instability of viscous two-component plasma has been explored, integrating the impacts of thermal conductivity. A general dispersion relation is gained by means of the normal mode analysis scheme with the assist of appropriate linearized perturbation equations of the problem, and an amended circumstance of thermal instability is acquired. For the case of longitudinal propagation, it is obvious that the circumstance of thermal instability is independent of the finite electron inertia, magnetic field strength and viscosity of two components but relies on the radiative heat-loss function, thermal conductivity and neutral particle. From the curves, it is clear that the temperature-dependent heat-loss function, thermal conductivity and viscosity of two components represent stabilizing impact, while finite electron inertia and neutral collision depict destabilizing impact. Results discussed in this problem are helpful for star formation in ISM.