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SDC13 infrared dark clouds: longitudinally collapsing filaments?

Peretto, N., Fuller, G. A., Andre, Ph., Arzoumanian, D., Rivilla, V. M., Bardeau, S., Duarte Puertas, S., Guzman Fernandez, J. P., Lenfestey, C., Li, G. -X., Olguin, F. A., Roeck, B. R., de Villiers, H. and Williams, J. 2014. SDC13 infrared dark clouds: longitudinally collapsing filaments? Astronomy and Astrophysics 561 , A83. 10.1051/0004-6361/201322172

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Formation of stars is now believed to be tightly linked to the dynamical evolution of interstellar filaments in which they form. In this paper we analyze the density structure and kinematics of a small network of infrared dark filaments, SDC13, observed in both dust continuum and molecular line emission with the IRAM 30 m telescope. These observations reveal the presence of 18 compact sources amongst which the two most massive, MM1 and MM2, are located at the intersection point of the parsec-long filaments. The dense gas velocity and velocity dispersion observed along these filaments show smooth, strongly correlated, gradients. We discuss the origin of the SDC13 velocity field in the context of filament longitudinal collapse. We show that the collapse timescale of the SDC13 filaments (from 1 Myr to 4 Myr depending on the model parameters) is consistent with the presence of Class I sources in them, and argue that, on top of bringing more material to the centre of the system, collapse could generate additional kinematic support against local fragmentation, helping the formation of starless super-Jeans cores.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 16 November 2016
Date of Acceptance: 31 October 2013
Last Modified: 06 May 2020 20:13

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  • SDC13 infrared dark clouds: longitudinally collapsing filaments? (deposited 16 Nov 2016 17:10) [Currently Displayed]

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