Universität zu Köln

Seifried, D. and Walch, S. (2015). The impact of turbulence and magnetic field orientation on star-forming filaments. Mon. Not. Roy. Astron. Soc., 452 (3). S. 2410 - 2423. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We present simulations of collapsing filaments studying the impact of turbulence and magnetic field morphologies on their evolution and star formation properties. We vary the mass per unit length of the filaments as well as the orientation of the magnetic field with respect to the major axis. We find that the filaments, which have no or a perpendicular magnetic field, typically reveal a smaller width than the universal width of 0.1 pc proposed by e.g. Arzoumanian et al. We show that this also holds in the presence of supersonic turbulence and that accretion driven turbulence is too weak to stabilize the filaments along their radial direction. On the other hand, we find that a magnetic field that is parallel to the major axis can stabilize the filament against radial collapse resulting in widths of 0.1 pc. Furthermore, depending on the filament mass and magnetic field configuration, gravitational collapse and fragmentation in filaments occurs either in an edge-on way, uniformly distributed across the entire length, or in a mixed way. In the presence of initially moderate density perturbations, a centralized collapse towards a common gravitational centre occurs. Our simulations can thus reproduce different modes of fragmentation observed recently in star-forming filaments. Moreover, we find that turbulent motions influence the distance between individual fragments along the filament, which does not always match the results of a Jeans analysis.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Seifried, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-392817
DOI:	10.1093/mnras/stv1458
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	452
Number:	3
Page Range:	S. 2410 - 2423
Date:	2015
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INFRARED DARK CLOUDS; GOULD BELT SURVEY; FREE-FALL TIME; MOLECULAR CLOUDS; CYLINDRICAL CLOUDS; INTERSTELLAR FILAMENTS; FINITE SHEETS; PIPE NEBULA; FRAGMENTATION; COLLAPSE Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39281