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The JCMT Gould Belt Survey: Evidence For Dust Grain Evolution In Perseus Star-forming Clumps

Chen, MC-Y; Di Francesco, J; Johnstone, D; Sadavoy, S; Hatchell, J; Mottram, JC; Kirk, H; ... Zhu, M; + view all (2016) The JCMT Gould Belt Survey: Evidence For Dust Grain Evolution In Perseus Star-forming Clumps. Astrophysical Journal , 826 (1) , Article 95. 10.3847/0004-637X/826/1/95. Green open access

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Abstract

The dust emissivity spectral index, β, is a critical parameter for deriving the mass and temperature of star-forming structures and, consequently, their gravitational stability. The β value is dependent on various dust grain properties, such as size, porosity, and surface composition, and is expected to vary as dust grains evolve. Here we present β, dust temperature, and optical depth maps of the star-forming clumps in the Perseus Molecular Cloud determined from fitting spectral energy distributions to combined Herschel and JCMT observations in the 160, 250, 350, 500, and 850 μm bands. Most of the derived β and dust temperature values fall within the ranges of 1.0–2.7 and 8–20 K, respectively. In Perseus, we find the β distribution differs significantly from clump to clump, indicative of grain growth. Furthermore, we also see significant localized β variations within individual clumps and find low-β regions correlate with local temperature peaks, hinting at the possible origins of low-β grains. Throughout Perseus, we also see indications of heating from B stars and embedded protostars, as well evidence of outflows shaping the local landscape.

Type: Article
Title: The JCMT Gould Belt Survey: Evidence For Dust Grain Evolution In Perseus Star-forming Clumps
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/0004-637X/826/1/95
Publisher version: http://doi.org/10.3847/0004-637X/826/1/95
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Dust, extinction; ISM: clouds; stars: formation; stars: low-mass; stars: protostars
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1516265
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