Universität zu Köln

Clarke, S. D., Williams, G. M. and Walch, S. (2020). The hierarchical fragmentation of filaments and the role of sub-filaments. Mon. Not. Roy. Astron. Soc., 497 (4). S. 4390 - 4407. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

Recent observations have revealed the presence of small fibres or sub-filaments within larger filaments. We present a numerical fragmentation study of fibrous filaments investigating the link between cores and sub-filaments using hydrodynamical simulations performed with the moving-mesh code AREPO. Our study suggests that cores form in two environments: (i) as isolated cores, or small chains of cores, on a single sub-filament, or (ii) as an ensemble of cores located at the junction of sub-filaments. We term these isolated and hub cores, respectively. We show that these core populations are statistically different from each other. Hub cores have a greater mean mass than isolated cores, and the mass distribution of hub cores is significantly wider than isolated cores. This fragmentation is reminiscent of parsec-scale hub-filament systems, showing that the combination of turbulence and gravity leads to similar fragmentation signatures on multiple scales, even within filaments. Moreover, the fact that fragmentation proceeds through sub-filaments suggests that there exists no characteristic fragmentation length-scale between cores. This is in opposition to earlier theoretical works studying fibre-less filaments which suggest a strong tendency towards the formation of quasi-periodically spaced cores, but in better agreement with observations. We also show tentative signs that global collapse of filaments preferentially form cores at both filament ends, which are more massive and dense than other cores.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Clarke, S. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Williams, G. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-316117
DOI:	10.1093/mnras/staa2298
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	497
Number:	4
Page Range:	S. 4390 - 4407
Date:	2020
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CLOUD; SIMULATIONS; EVOLUTION; COLLAPSE Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31611