Submillimeter Continuum Variability in Planck Galactic Cold Clumps

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Park , G , Kim , K-T , Johnstone , D , Kang , S , Liu , T , Mairs , S , Choi , M , Lee , J-E , Sanhueza , P , Juvela , M , Kang , M , Eden , D , Soam , A , Montillaud , J , Fuller , G A , Koch , P M , Lee , C W , Stamatellos , D , Rawlings , J , Kim , G , Zhang , C-P , Kwon , W & Yoo , H 2019 , ' Submillimeter Continuum Variability in Planck Galactic Cold Clumps ' , Astrophysical Journal Supplement Series , vol. 242 , no. 2 , 27 .

Title: Submillimeter Continuum Variability in Planck Galactic Cold Clumps
Author: Park, Geumsook; Kim, Kee-Tae; Johnstone, Doug; Kang, Sung-ju; Liu, Tie; Mairs, Steve; Choi, Minho; Lee, Jeong-Eun; Sanhueza, Patricio; Juvela, Mika; Kang, Miju; Eden, David; Soam, Archana; Montillaud, Julien; Fuller, Gary A.; Koch, Patrick M.; Lee, Chang Won; Stamatellos, Dimitris; Rawlings, Jonathan; Kim, Gwanjeong; Zhang, Chuan-Peng; Kwon, Woojin; Yoo, Hyunju
Contributor organization: Department of Physics
Date: 2019-06
Language: eng
Number of pages: 12
Belongs to series: Astrophysical Journal Supplement Series
ISSN: 0067-0049
Abstract: In the early stages of star formation, a protostar is deeply embedded in an optically thick envelope such that it is not directly observable. Variations in the protostellar accretion rate, however, will cause luminosity changes that are reprocessed by the surrounding envelope and are observable at submillimeter wavelengths. We searched for submillimeter flux variability toward 12 Planck Galactic Cold Clumps detected by the James Clerk Maxwell Telescope (JCMT)-SCUBA-2 Continuum Observations of Pre-protostellar Evolution (SCOPE) survey. These observations were conducted at 850 mu m using the JCMT/SCUBA-2. Each field was observed three times over about 14 months between 2016 April and 2017 June. We applied a relative flux calibration and achieved a calibration uncertainty of similar to 3.6% on average. We identified 136 clumps across 12 fields and detected four sources with flux variations of similar to 30%. For three of these sources, the variations appear to be primarily due to large-scale contamination, leaving one plausible candidate. The flux change of the candidate may be associated with low- or intermediate-mass star formation assuming a distance of 1.5 kpc, although we cannot completely rule out the possibility that it is a random deviation. Further studies with dedicated monitoring would provide a better understanding of the detailed relationship between submillimeter flux and accretion rate variabilities while enhancing the search for variability in star-forming clumps farther away than the Gould Belt.
Subject: stars: formation
submillimeter: general
submillimeter: ISM
115 Astronomy, Space science
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: publishedVersion

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