Universität zu Köln

Pardi, A., Girichidis, P., Naab, T., Walch, S., Peters, T., Heitsch, F., Glover, S. C. O., Klessen, R. S., Wuensch, R. and Gatto, A. (2017). The impact of magnetic fields on the chemical evolution of the supernova-driven ISM. Mon. Not. Roy. Astron. Soc., 465 (4). S. 4611 - 4634. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We present three-dimensional magneto-hydrodynamical simulations of the self-gravitating interstellarmedium (ISM) in a periodic (256 pc)(3) box with a mean number density of 0.5 cm(-3). At a fixed supernova rate we investigate the multi-phase ISM structure, H2 molecule formation and density-magnetic field scaling for varying initial magnetic field strengths (0, 6 x 10(-3), 0.3, 3 mu G). All magnetic runs saturate at mass-weighted field strengths of similar to 1-3 mu G but the ISM structure is notably different. With increasing initial field strengths (from 6 x 10(-3) to 3 mu G) the simulations develop an ISM with a more homogeneous density and temperature structure, with increasing mass (from 5 to 85 per cent) and volume filling fractions (VFFs; from 4 to 85 per cent) of warm (300 < T < 8000 K) gas, with decreasing VFFs from similar to 35 to similar to 12 per cent of hot gas (T > 10(5) K) and with a decreasing H2 mass fraction (from 70 to < 1 per cent). Meanwhile, the mass fraction of gas in which the magnetic pressure dominates over the thermal pressure increases by a factor of 10, from 0.07 for an initial field of 6 x 10(-3) mu G to 0.7 for a 3 mu G initial field. In all but the simulations with the highest initial field strength self-gravity promotes the formation of dense gas and H2, but does not change any other trends. We conclude that magnetic fields have a significant impact on the multi-phase, chemical and thermal structure of the ISM and discuss potential implications and limitations of the model.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Pardi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Girichidis, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Naab, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Peters, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heitsch, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Glover, S. C. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klessen, R. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wuensch, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gatto, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-238617
DOI:	10.1093/mnras/stw3071
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	465
Number:	4
Page Range:	S. 4611 - 4634
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 TURBULENT INTERSTELLAR-MEDIUM; MOLECULAR CLOUD FORMATION; LARGE-MAGELLANIC-CLOUD; STAR CLUSTER FORMATION; OH ZEEMAN OBSERVATIONS; GRAVITATIONAL COLLAPSE; SUPERSONIC TURBULENCE; NUMERICAL SIMULATIONS; DYNAMICAL EVOLUTION; PHYSICAL PROCESSES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23861