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Unveiling the Early-Stage Anatomy of a Protocluster Hub with ALMA

Henshaw, JD and Jimenez-Serra, I and Longmore, SN and Caselli, P and Pineda, JE and Avison, A and Barnes, AT and Tan, JC and Fontani, F (2016) Unveiling the Early-Stage Anatomy of a Protocluster Hub with ALMA. Monthly Notices of the Royal Astronomical Society Letters. ISSN 1745-3933

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Abstract

High-mass stars shape the interstellar medium in galaxies, and yet, largely because the initial conditions are poorly constrained, we do not know how they form. One possibility is that high-mass stars and star clusters form at the junction of filamentary networks, referred to as "hubs". In this letter we present the complex anatomy of a protocluster hub within an Infrared Dark Cloud (IRDC), G035.39-00.33, believed to be in an early phase of its evolution. We use high-angular resolution ($\{\theta_{\rm maj}, \theta_{\rm min}\}=\{1.''4, 0.''8\}\sim\{0.02\,{\rm pc}, 0.01\,{\rm pc}\}$) and high-sensitivity ($0.2$ mJy beam$^{-1}$; $\sim0.2$ M$_{\odot}$) 1.07 mm dust continuum observations from the Atacama Large Millimeter Array (ALMA) to identify a network of narrow, $0.028\,\pm\,0.005$ pc wide, filamentary structures. These are a factor of $\gtrsim3$ narrower than the proposed "quasi-universal" $\sim0.1$ pc width of interstellar filaments. Additionally, 28 compact objects are reported, spanning a mass range $0.3\,{\rm M_{\odot}}<M_{\rm c}<10.4\,{\rm M_{\odot}}$. This indicates that at least some low-mass objects are forming coevally with more massive counterparts. Comparing to the popular "bead-on-a-string" analogy, the protocluster hub is poorly represented by a monolithic clump embedded within a single filament. Instead, it comprises multiple intra-hub filaments, each of which retains its integrity as an independent structure and possesses its own embedded core population.

Item Type: Article
Additional Information: Author contacted for acceptance date. 5/8/16 MS This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Letters ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 05 Aug 2016 09:33
Last Modified: 05 Aug 2016 09:33
DOI or Identification number: 10.1093/mnrasl/slw154
URI: http://researchonline.ljmu.ac.uk/id/eprint/4002

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