Star formation through thermal instability of radiative plasma with finite electron inertia and finite Larmor radius corrections

Journal Article · Mon Aug 15 04:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4961991· OSTI ID:22611370

Kaothekar, Sachin ^[1]

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1. Department of Physics, Mahakal Institute of Technology, Ujjain-456664, Madhya Pradesh (India)

I have studied the effects of finite electron inertia, finite ion Larmor radius (FLR) corrections, and radiative heat-loss function on the thermal instability of an infinite homogeneous, viscous plasma incorporating the effect of thermal conductivity for star formation in interstellar medium (ISM). A general dispersion relation is derived using the normal mode analysis method with the help of relevant linearized perturbation equations of the problem. The wave propagation is discussed for longitudinal and transverse directions to the external magnetic field and the conditions of modified thermal instabilities and stabilities are discussed in different cases. We find that the thermal instability criterion is get modified into radiative instability criterion by inclusion of radiative heat-loss functions with thermal conductivity. The viscosity of medium removes the effect of FLR corrections from the condition of radiative instability. Numerical calculation shows stabilizing effect of heat-loss function, viscosity and FLR corrections, and destabilizing effect of finite electron inertia on the thermal instability. Results carried out in this paper shows that stars are formed in interstellar medium mainly due to thermal instability.

• OSTI ID: 22611370
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 8 Vol. 6; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CORRECTIONS
DISPERSION RELATIONS
DISPERSIONS
DISTURBANCES
ELECTRONS
HEAT LOSSES
INSTABILITY
INTERSTELLAR SPACE
LARMOR RADIUS
MAGNETIC FIELDS
MOMENT OF INERTIA
NORMAL-MODE ANALYSIS
PERTURBATION THEORY
PLASMA
STABILITY
STARS
THERMAL CONDUCTIVITY
VISCOSITY
WAVE PROPAGATION