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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., Mottram, J.C., Veneziani, M., Traficante, A., Schisano, E., Giardino, G., Falgarone, E., Urquhart, J.S., Harrison, D. L., Joncas, G., and others. (2021) The Planck Submillimeter Properties of Galactic High-mass Star-forming Regions: Dust Temperatures, Luminosities, Masses, and Star Formation Efficiency. Astrophysical Journal, 911 (1). Article Number 69. ISSN 0004-637X. E-ISSN 1538-4357. (doi:10.3847/1538-4357/abe711) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:86670)

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Abstract

Massive star formation occurs in the interior of giant molecular clouds (GMC) and proceeds through many stages. In this work, we focus on massive young stellar objects (MYSOs) and Ultra-Compact HII regions (UCH II), where the former are enshrouded in dense envelopes of dust and gas, which the latter have begun dispersing. By selecting a complete sample of MYSOs and UCH II from the Red MSX Source (RMS) survey data base, we combine Planck and IRAS data and build their Spectral Energy Distributions (SEDs). 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 investigating the instantaneous Star Formation Efficiency (SFE) as a function of Galactocentric radius. We find that the SFE increase between 2 and 4.5 kpc, where it reaches a peak, likely in correspondence of 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 RG > 8 kpc. Finally we present diagnostic colors that can be used to identify sites of massive star formation.

Item Type: Article
DOI/Identification number: 10.3847/1538-4357/abe711
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: James Urquhart
Date Deposited: 19 Feb 2021 15:23 UTC
Last Modified: 01 Jun 2021 15:59 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/86670 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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