Universität zu Köln

Cox, N. L. J., Arzoumanian, D., Andre, Ph., Rygl, K. L. J., Prusti, T., Men'shchikov, A., Royer, P., Kospal, A., Palmeirim, P., Ribas, A., Konyves, V., Bernard, J. -Ph., Schneider, N., Bontemps, S., Merin, B., Vavrek, R., de Oliveira, C. Alves, Didelon, P., Pilbratt, G. L. and Waelkens, C. (2016). Filamentary structure and magnetic field orientation in Musca. Astron. Astrophys., 590. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Herschel has shown that filamentary structures are ubiquitous in star-forming regions, in particular in nearby molecular clouds associated with Gould's Belt. High dynamic range far-infrared imaging of the Musca cloud with SPIRE and PACS reveals at least two types of filamentary structures: (1) the main similar to 10-pc scale high column-density linear filament; and (2) low column-density striations in close proximity to the main filament. In addition, we find features with intermediate column densities (hair-like strands) that appear physically connected to the main filament. We present an analysis of this filamentary network traced by Herschel and explore its connection with the local magnetic field. We find that both the faint dust emission striations and the plane-of-the-sky (POS) magnetic field are locally oriented close to perpendicular to the high-density main filament (position angle similar to 25-35 degrees). The low-density striations and strands are oriented parallel to the POS magnetic field lines, which are derived previously from optical polarization measurements of background stars and more recently from Planck observations of dust polarized emission. The position angles are 97 +/- 25 degrees, 105 +/- 7 degrees, and 105 +/- 5 degrees. From these observations, we propose a scenario in which local interstellar material in this cloud has condensed into a gravitationally-unstable filament (with supercritical mass per unit length) that is accreting background matter along field lines through the striations. We also compare the filamentary structure in Musca with what is seen in similar Herschel observations of the Taurus B211/3 filament system and find that there is significantly less substructure in the Musca main filament than in the B211/3 filament. We suggest that the Musca cloud may represent an earlier evolutionary stage in which the main filament has not yet accreted sufficient mass and energy to develop a multiple system of intertwined filamentary components.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Cox, N. L. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Arzoumanian, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Andre, Ph. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rygl, K. L. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Prusti, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Men'shchikov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Royer, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kospal, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palmeirim, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ribas, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Konyves, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bernard, J. -Ph. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bontemps, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Merin, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vavrek, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED de Oliveira, C. Alves UNSPECIFIED UNSPECIFIED UNSPECIFIED Didelon, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pilbratt, G. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Waelkens, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-273334
DOI:	10.1051/0004-6361/201527068
Journal or Publication Title:	Astron. Astrophys.
Volume:	590
Date:	2016
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ACCRETION-DRIVEN TURBULENCE; LARGE-SCALE STRUCTURE; MOLECULAR CLOUDS; PRESTELLAR CORES; DENSE CORES; GRAVITATIONAL INFALL; STAR-FORMATION; HERSCHEL VIEW; DARK-CLOUDS; CHAMELEON Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27333