Universität zu Köln

Gatto, Andrea, Walch, Stefanie, Naab, Thorsten ORCID: 0000-0002-7314-2558, Girichidis, Philipp ORCID: 0000-0002-9300-9914, Wuensch, Richard, Glover, Simon C. O., Klessen, Ralf S., Clark, Paul C., Peters, Thomas, Derigs, Dominik ORCID: 0000-0002-9687-2035, Baczynski, Christian and Puls, Joachim (2017). The SILCC project - III. Regulation of star formation and outflows by stellar winds and supernovae. Mon. Not. Roy. Astron. Soc., 466 (2). S. 1903 - 1925. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We study the impact of stellar winds and supernovae on the multiphase interstellar medium using three-dimensional hydrodynamical simulations carried out with FLASH. The selected galactic disc region has a size of (500 pc)(2) x +/- 5 kpc and a gas surface density of 10M(circle dot) pc(-2). The simulations include an external stellar potential and gas self-gravity, radiative cooling and diffuse heating, sink particles representing star clusters, stellar winds from these clusters that combine the winds from individual massive stars by following their evolution tracks, and subsequent supernova explosions. Dust and gas (self-) shielding is followed to compute the chemical state of the gas with a chemical network. We find that stellar winds can regulate star (cluster) formation. Since the winds suppress the accretion of fresh gas soon after the cluster has formed, they lead to clusters that have lower average masses (10(2)-10(4.3)M(circle dot)) and form on shorter time-scales (10(-3)-10 Myr). In particular, we find an anticorrelation of cluster mass and accretion time-scale. Without winds, the star clusters easily grow to larger masses for similar to 5 Myr until the first supernova explodes. Overall, the most massive stars provide the most wind energy input, while objects beginning their evolution as B-type stars contribute most of the supernova energy input. A significant outflow from the disc (mass loading greater than or similar to 1 at 1 kpc) can be launched by thermal gas pressure if more than 50 per cent of the volume near the disc mid-plane can be heated to T > 3 x 10(5) K. Stellar winds alone cannot create a hot volume-filling phase. The models that are in best agreement with observed star formation rates drive either no outflows or weak outflows.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gatto, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, Stefanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 UNSPECIFIED Girichidis, Philipp UNSPECIFIED orcid.org/0000-0002-9300-9914 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 Puls, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-235759
DOI:	10.1093/mnras/stw3209
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	466
Number:	2
Page Range:	S. 1903 - 1925
Date:	2017
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GIANT MOLECULAR CLOUDS; INITIAL MASS FUNCTION; MAGNETIZED INTERSTELLAR-MEDIUM; MULTIPHASE GALACTIC DISKS; SINK PARTICLE ALGORITHM; LARGE-MAGELLANIC-CLOUD; HOT LUMINOUS STARS; VELOCITY DISPERSION; RADIATION-PRESSURE; FORMING GALAXIES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23575