Universität zu Köln

Walch, Stefanie and Naab, Thorsten ORCID: 0000-0002-7314-2558 (2015). The energy and momentum input of supernova explosions in structured and ionized molecular clouds. Mon. Not. Roy. Astron. Soc., 451 (3). S. 2757 - 2772. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We investigate the early impact of single and binary supernova (SN) explosions on dense gas clouds with three-dimensional, high-resolution, hydrodynamic simulations. The effect of cloud structure, radiative cooling and ionizing radiation from the progenitor stars on the net input of kinetic energy, f(kin) = E-kin/E-SN, thermal energy, f(therm) = E-therm/E-SN, and gas momentum, f(P) = P/P-SN, to the interstellar medium (ISM) is tested. For clouds with (n) over bar = 100 cm(-3), the momentum generating Sedov and pressure-driven snowplough phases are terminated early (proportional to 0.01 Myr) and radiative cooling limits the coupling to f(therm) similar to 0.01, f(kin) similar to 0.05, and f(P) similar to 9, significantly lower than for the case without cooling. For pre-ionized clouds, these numbers are only increased by similar to 50 per cent, independent of the cloud structure. This only suffices to accelerate similar to 5 per cent of the cloud to radial velocities greater than or similar to 30 km s(-1). A second SN might enhance the coupling efficiencies if delayed past the Sedov phase of the first explosion. Such very low coupling efficiencies cast doubts on many subresolution models for SN feedback, which are, in general, validated a posteriori. Ionizing radiation appears not to significantly enhance the coupling of SNe to the surrounding gas as it drives the ISM into inert dense shells and cold clumps, a process which is unresolved in galaxy-scale simulations. Our results indicate that the momentum input of SNe in ionized, structured clouds is larger (more than a factor of 10) than the corresponding momentum yield of the progenitor's stellar winds.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Walch, Stefanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-396515
DOI:	10.1093/mnras/stv1155
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	451
Number:	3
Page Range:	S. 2757 - 2772
Date:	2015
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STAR-FORMATION; INTERSTELLAR-MEDIUM; STELLAR FEEDBACK; GALAXY FORMATION; MASSIVE STARS; EVOLUTION; SIMULATIONS; ORIGIN; WINDS; STARBURST99 Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39651