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Self-regulating supernovae heating in interstellar medium simulations

Lookup NU author(s): Dr Graeme Sarson, Professor Anvar Shukurov, Professor Axel Brandenburg

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Abstract

Numerical simulations of the multi-phase interstellar medium have been carried out, using a 3D, nonlinear, magnetohydrodynamic, shearing-box model, with random motions driven by supernova explosions. These calculations incorporate the effects of magnetic fields and rotation in 3D; these play important dynamical roles in the galaxy, but are neglected in many other simulations. The supernovae driving the motions are not arbitrarily imposed, but occur where gas accumulates into cold, dense clouds; their implementation uses a physically motivated model for the evolution of such clouds. The process is self-regulating, and produces mean supernova rates as part of the solution. Simulations with differing mean density show a power law relation between the supernova rate and density, with exponent 1.7; this value is within the range suggested from observations (taking star formation rate as a proxy for supernova rate). The global structure of the supernova driven medium is strongly affected by the presence of magnetic fields; e.g. for one solution the filling factor of hot gas is found to vary from 0.19 (with no field) to 0.12 (with initial mid-plane field B 0= 6 muG).


Publication metadata

Author(s): Sarson GR, Nordlund A, Gudiksen B, Shukurov A, Brandenburg A

Publication type: Article

Publication status: Published

Journal: Astrophysics and Space Science

Year: 2004

Volume: 292

Issue: 1-4

Pages: 267-272

ISSN (print): 0004-640X

ISSN (electronic): 1572-946X

Publisher: Springer

URL: http://dx.doi.org/10.1023/B:ASTR.0000045026.24564.bc

DOI: 10.1023/B:ASTR.0000045026.24564.bc


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