Journal Article

Supernova blast waves in wind-blown bubbles, turbulent, and power-law ambient media

S. Haid, S. Walch, T. Naab, D. Seifried, J. Mackey and A. Gatto

in Monthly Notices of the Royal Astronomical Society

Volume 460, issue 3, pages 2962-2978
ISSN: 0035-8711
Published online May 2016 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1093/mnras/stw1082
Supernova blast waves in wind-blown bubbles, turbulent, and power-law ambient media

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Supernova (SN) blast waves inject energy and momentum into the interstellar medium (ISM), control its turbulent multiphase structure and the launching of galactic outflows. Accurate modelling of the blast wave evolution is therefore essential for ISM and galaxy formation simulations. We present an efficient method to compute the input of momentum, thermal energy, and the velocity distribution of the shock-accelerated gas for ambient media (densities of 0.1 ≥ n0 [cm− 3] ≥ 100) with uniform (and with stellar wind blown bubbles), power-law, and turbulent (Mach numbers [math] from 1to100) density distributions. Assuming solar metallicity cooling, the blast wave evolution is followed to the beginning of the momentum conserving snowplough phase. The model recovers previous results for uniform ambient media. The momentum injection in wind-blown bubbles depend on the swept-up mass and the efficiency of cooling, when the blast wave hits the wind shell. For power-law density distributions with n(r) ∼ r−2 (for n(r) > nfloor) the amount of momentum injection is solely regulated by the background density nfloor and compares to nuni = nfloor. However, in turbulent ambient media with lognormal density distributions the momentum input can increase by a factor of 2 (compared to the homogeneous case) for high Mach numbers. The average momentum boost can be approximated as [math]. The velocity distributions are broad as gas can be accelerated to high velocities in low-density channels. The model values agree with results from recent, computationally expensive, three-dimensional simulations of SN explosions in turbulent media.

Keywords: shock waves; turbulence; ISM: supernova remnants

Journal Article.  12722 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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