Universität zu Köln

Seifried, Daniel ORCID: 0000-0002-0368-9160, Walch, Stefanie ORCID: 0000-0001-6941-7638, Haid, Sebastian, Girichidis, Philipp and Naab, Thorsten ORCID: 0000-0002-7314-2558 (2018). Is Molecular Cloud Turbulence Driven by External Supernova Explosions? Astrophys. J., 855 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

Full text not available from this repository.

Abstract

We present high-resolution (similar to 0.1 pc), hydrodynamical and magnetohydrodynamical simulations to investigate whether the observed level of molecular cloud (MC) turbulence can be generated and maintained by external supernova (SN) explosions. The MCs are formed self-consistently within their large-scale galactic environment following the non-equilibrium formation of H-2 and CO, including (self-) shielding and important heating and cooling processes. The MCs inherit their initial level of turbulence from the diffuse ISM, where turbulence is injected by SN explosions. However, by systematically exploring the effect of individual SNe going off outside the clouds, we show that at later stages the importance of SN-driven turbulence is decreased significantly. This holds for different MC masses as well as for MCs with and without magnetic fields. The SN impact also decreases rapidly with larger distances. Nearby SNe (d similar to 25 pc) boost the turbulent velocity dispersions of the MC by up to 70% (up to a few km s(-1)). For d > 50 pc, however, their impact decreases fast with increasing d and is almost negligible. For all probed distances the gain in velocity dispersion decays rapidly within a few 100 kyr. This is significantly shorter than the average timescale for an MC to be hit by a nearby SN under solar neighborhood conditions (similar to 2 Myr). Hence, at these conditions SNe are not able to sustain the observed level of MC turbulence. However, in environments with high gas surface densities and SN rates, like the Central Molecular Zone, observed elevated MC dispersions could be triggered by external SNe.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Seifried, Daniel UNSPECIFIED orcid.org/0000-0002-0368-9160 UNSPECIFIED Walch, Stefanie UNSPECIFIED orcid.org/0000-0001-6941-7638 UNSPECIFIED Haid, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Girichidis, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-192870
DOI:	10.3847/1538-4357/aaacff
Journal or Publication Title:	Astrophys. J.
Volume:	855
Number:	2
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STAR-FORMATION; GALACTIC-CENTER; MASS; REMNANTS; ENERGY; GALAXY; FLASH; CODE; SIMULATIONS; CHALLENGES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19287