Universität zu Köln

Hu, Chia-Yu ORCID: 0000-0002-9235-3529, Naab, Thorsten ORCID: 0000-0002-7314-2558, Glover, Simon C. O., Walch, Stefanie and Clark, Paul C. (2017). Variable interstellar radiation fields in simulated dwarf galaxies: supernovae versus photoelectric heating. Mon. Not. Roy. Astron. Soc., 471 (2). S. 2151 - 2174. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We present high-resolution hydrodynamical simulations of isolated dwarf galaxies including self-gravity, non-equilibrium cooling and chemistry, interstellar radiation fields (ISRF) and shielding, star formation, and stellar feedback. This includes spatially and temporally varying photoelectric (PE) heating, photoionization, resolved supernova (SN) blast waves and metal enrichment. A new flexible method to sample the stellar initial mass function allows us to follow the contribution to the ISRF, the metal output and the SN delay times of individual massive stars. We find that SNe play the dominant role in regulating the global star formation rate, shaping the multiphase interstellar medium (ISM) and driving galactic outflows. Outflow rates (with mass-loading factors of a few) and hot gas fractions of the ISM increase with the number of SNe exploding in low-density environments where radiative energy losses are low. While PE heating alone can suppress star formation as efficiently as SNe alone can do, it is unable to drive outflows and reproduce the multiphase ISM that emerges naturally whenever SNe are included. We discuss the potential origins for the discrepancy between our results and another recent study that claimed that PE heating dominates over SNe. In the absence of SNe and photoionization (mechanisms to disperse dense clouds), the impact of PE heating is highly overestimated owing to the (unrealistic) proximity of dense gas to the radiation sources. This leads to a substantial boost of the infrared continuum emission from the UV-irradiated dust and a far-infrared line-to-continuum ratio too low compared to observations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hu, Chia-Yu UNSPECIFIED orcid.org/0000-0002-9235-3529 UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 UNSPECIFIED Glover, Simon C. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, Stefanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, Paul C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-217238
DOI:	10.1093/mnras/stx1773
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	471
Number:	2
Page Range:	S. 2151 - 2174
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 SMOOTHED PARTICLE HYDRODYNAMICS; STANDARD STELLAR LIBRARY; STAR-FORMATION; MOLECULAR CLOUDS; MASSIVE STARS; EVOLUTIONARY SYNTHESIS; SILCC PROJECT; DARK-MATTER; DRIVEN; GAS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21723