SDC13 infrared dark clouds: longitudinally collapsing filaments?

By Nicolas Peretto, G. Fuller, P. Andr'e, D. Arzoumanian, V. Rivilla, S. Bardeau, S. Puertas, J. P. G. Fernandez, C. Lenfestey, Guangxing Li and 4 more. 2013

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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.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/2689c8bd50a2a17e3cc56f520afb23dcce55a4cb

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Citations in the corpus

An ALMA study of the Orion Integral Filament: I. Evidence for narrow fibers in a massive cloud (2018, background): “Current observational evidence indicates increasing levels of substructure at sub-parsec scales in massive IRDCs (e.g., Peretto et al. 2014; Beuther et al. 2015; Henshaw et al. 2016).”
Global hierarchical collapse in molecular clouds. Towards a comprehensive scenario (2019, background): “…along the filaments, which feed the central clumps (e.g., Sugitani et al. 2011; Kirk et al. 2013; Fernández-López et al. 2014; Motte et al. 2014; Peretto et al. 2014; Tackenberg et al. 2014; Jiménez-Serra et al. 2014; Hajigholi et al. 2016; Wyrowski et al. 2016; Juárez et al. 2017; Rayner…”