Universität zu Köln

Haid, S., Walch, S., Naab, T., Seifried, D., Mackey, J. and Gatto, A. (2016). Supernova blast waves in wind-blown bubbles, turbulent, and power-law ambient media. Mon. Not. Roy. Astron. Soc., 460 (3). S. 2962 - 2979. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

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 a parts per thousand yen n(0) [cm(- 3)] a parts per thousand yen 100) with uniform (and with stellar wind blown bubbles), power-law, and turbulent (Mach numbers 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) similar to r(-2) (for n(r) > n(floor)) the amount of momentum injection is solely regulated by the background density n(floor) and compares to n(uni) = n(floor). 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 p(turb)/p(0) = 23.07 (n(0,turb)/1 cm(-3))(-0.12) + 0.82( ln(1 + b(2) M-2))(1.49) (n(0,turb)/1 cm(-3))(-1.6). T. 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Haid, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Naab, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Seifried, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mackey, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gatto, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-266614
DOI:	10.1093/mnras/stw1082
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	460
Number:	3
Page Range:	S. 2962 - 2979
Date:	2016
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DENSITY PROBABILITY-DISTRIBUTION; MULTIPHASE GALACTIC DISKS; SELF-SIMILAR SOLUTIONS; INITIAL MASS FUNCTION; STAR-FORMATION RATES; THIN SHELL FORMATION; INTERSTELLAR-MEDIUM; MOLECULAR CLOUDS; SUPERSONIC TURBULENCE; STELLAR FEEDBACK Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26661