Universität zu Köln

Girichidis, Philipp ORCID: 0000-0002-9300-9914, Walch, Stefanie, Naab, Thorsten ORCID: 0000-0002-7314-2558, Gatto, Andrea, Wuensch, Richard, Glover, Simon C. O., Klessen, Ralf S., Clark, Paul C., Peters, Thomas, Derigs, Dominik ORCID: 0000-0002-9687-2035 and Baczynski, Christian (2016). The SILCC (SImulating the LifeCycle of molecular Clouds) project - II. Dynamical evolution of the supernova-driven ISM and the launching of outflows. Mon. Not. Roy. Astron. Soc., 456 (4). S. 3432 - 3456. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

The SILCC project (SImulating the Life-Cycle of molecular Clouds) aims at a more self-consistent understanding of the interstellar medium (ISM) on small scales and its link to galaxy evolution. We present three-dimensional (magneto) hydrodynamic simulations of the ISM in a vertically stratified box including self-gravity, an external potential due to the stellar component of the galactic disc, and stellar feedback in the form of an interstellar radiation field and supernovae (SNe). The cooling of the gas is based on a chemical network that follows the abundances of H+, H, H-2, C+, and CO and takes shielding into account consistently. We vary the SN feedback by comparing different SN rates, clustering and different positioning, in particular SNe in density peaks and at random positions, which has a major impact on the dynamics. Only for random SN positions the energy is injected in sufficiently low-density environments to reduce energy losses and enhance the effective kinetic coupling of the SNe with the gas. This leads to more realistic velocity dispersions (sigma(HI) approximate to 0.8 sigma(300-8000) (K) similar to 10-20 km s(-1), sigma(H alpha) approximate to 0.6(8000-3x105 K) similar to 20-30 km s(-1)), and strong outflows with mass loading factors (ratio of outflow to star formation rate) of up to 10 even for solar neighbourhood conditions. Clustered SNe abet the onset of outflows compared to individual SNe but do not influence the net outflow rate. The outflows do not contain any molecular gas and are mainly composed of atomic hydrogen. The bulk of the outflowing mass is dense (rho similar to 10(-25)-10(-24) g cm(-3)) and slow (v similar to 20-40 km s(-1)) but there is a high-velocity tail of up to v similar to 500 km s(-1) with rho similar to 10(-28)-10(-27) g cm(-3).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Girichidis, Philipp UNSPECIFIED orcid.org/0000-0002-9300-9914 UNSPECIFIED Walch, Stefanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 UNSPECIFIED Gatto, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Wuensch, Richard UNSPECIFIED UNSPECIFIED UNSPECIFIED Glover, Simon C. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klessen, Ralf S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, Paul C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peters, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Derigs, Dominik UNSPECIFIED orcid.org/0000-0002-9687-2035 UNSPECIFIED Baczynski, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-281571
DOI:	10.1093/mnras/stv2742
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	456
Number:	4
Page Range:	S. 3432 - 3456
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 STAR-FORMING GALAXIES; MULTIPHASE INTERSTELLAR-MEDIUM; KENNICUTT-SCHMIDT RELATIONSHIP; LARGE-MAGELLANIC-CLOUD; O-TYPE STARS; NEARBY GALAXIES; MAGNETIC-FIELDS; GALACTIC DISC; IONIZING-RADIATION; RUNAWAY STARS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28157