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Star formation in IRDC G31.97+0.07

Zhou, C, Zhu, M, Yuan, J, Wu, Y, Yuan, L, Moore, TJT and Eden, DJ (2019) Star formation in IRDC G31.97+0.07. Monthly Notices of the Royal Astronomical Society, 485 (3). pp. 3334-3351. ISSN 0035-8711

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Abstract

We utilize multiple-waveband continuum and molecular-line data of CO isotopes to study the dynamical structure and physical properties of the IRDC G31.97+0.07. We derive the dust temperature and H2 column density maps of the whole structure by spectral energy distribution fitting. The total mass is about 2.5×105M⊙ for the whole filamentary structure and about 7.8×104M⊙ for the infrared dark cloud (IRDC). Column density probability distribution functions (PDFs) produced from the column density map are generally in the power-law form, suggesting that this part is mainly gravity dominant. The flatter slope of the PDF of the IRDC implies that it might be compressed by an adjacent, larger H II region. There are 27 clumps identified from the 850 μm continuum located in this filamentary structure. Based on the average spacing of the fragments in the IRDC, we estimate the age of the IRDC. The age is about 6.4 Myr, assuming inclination angle i = 30°. For 18 clumps with relatively strong CO and 13CO (3–2) emission, we study their line profiles and stabilities. We find five clumps with blue profiles that indicate gas infall motion and two clumps with red profiles that indicate outflows or expansion. Only one clump has αvir > 2, suggesting that most clumps are gravitationally bound and tend to collapse. In the mass–Req diagram, 23 of 27 clumps are above the threshold for high-mass star formation, suggesting that this region can be a good place for studying high-mass star forming.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 09 Oct 2019 08:56
Last Modified: 09 Oct 2019 09:00
DOI or Identification number: 10.1093/mnras/stz603
URI: http://researchonline.ljmu.ac.uk/id/eprint/11499

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