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The Planck Submillimeter Properties of Galactic High-mass Star-forming Regions: Dust Temperatures, Luminosities, Masses, and Star Formation Efficiency

Paladini, R. and Mottram, J. C. and Veneziani, M. and Traficante, A. and Schisano, E. and Giardino, G. and Falgarone, E. and Urquhart, J. S. and Harrison, D. L. and Joncas, G. and Umana, G. and Molinari, S. (2021) The Planck Submillimeter Properties of Galactic High-mass Star-forming Regions: Dust Temperatures, Luminosities, Masses, and Star Formation Efficiency. Astrophysical Journal, 911 (1). p. 69. ISSN 0004-637X. doi:10.3847/1538-4357/abe711.

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Massive star formation occurs in the interior of giant molecular clouds and proceeds through many stages. In this work, we focus on massive young stellar objects (MYSOs) and ultracompact H ii regions (UCH ii), where the former are enshrouded in dense envelopes of dust and gas, the latter of which has begun dispersing. By selecting a complete sample of MYSOs and UCH ii from the Red MSX Source (RMS) survey database, we combine Planck and IRAS data and build their spectral energy distributions. With these, we estimate the physical properties (dust temperatures, mass, luminosity) of the sample. Because the RMS database provides unique solar distances, it also allows the instantaneous star formation efficiency (SFE) to be investigated as a function of Galactocentric radius. We find that the SFE increases between 2 and 4.5 kpc, where it reaches a peak, likely in correspondence with the accumulation of molecular material at the end of the Galactic bar. It then stays approximately constant up to 9 kpc, after which it linearly declines, in agreement with predictions from extragalactic studies. This behavior suggests the presence of a significant amount of undetected molecular gas at R_G > 8 kpc. Finally, we present diagnostic colors that can be used to identify sites of massive star formation.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Paladini, R.0000-0002-5158-243X
Traficante, A.0000-0003-1665-6402
Giardino, G.0000-0002-9262-7155
Falgarone, E.0000-0003-0693-2477
Urquhart, J. S.0000-0002-1605-8050
Harrison, D. L.0000-0001-8687-6588
Molinari, S.0000-0002-9826-7525
Additional Information:© 2021. The American Astronomical Society. Received 2020 September 25; revised 2021 February 11; accepted 2021 February 15; published 2021 April 16. This paper is based and made use of information from the Red MSX Source survey database at which was constructed with support from the Science and Technology Facilities Council of the UK. We thank the anonymous referee for the comments that have greatly improved our work.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:H II regions; Compact H II region; Young stellar objects; Protostars
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: H II regions (694); Compact H II region (286); Young stellar objects (1834); Protostars (1302)
Record Number:CaltechAUTHORS:20210423-164857573
Persistent URL:
Official Citation:R. Paladini et al 2021 ApJ 911 69
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108833
Deposited By: George Porter
Deposited On:27 Apr 2021 15:04
Last Modified:16 Nov 2021 19:32

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