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Star formation scales and efficiency in Galactic spiral arms

Eden, D.J., Moore, T.J.T., Urquhart, J.S., Elia, D., Plume, R., Rigby, A.J., Thompson, M.A. (2015) Star formation scales and efficiency in Galactic spiral arms. Monthly Notices of the Royal Astronomical Society, 452 (1). pp. 289-300. ISSN 0035-8711. (doi:10.1093/mnras/stv1323) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://www.dx.doi.org/10.1093/mnras/stv1323

Abstract

We positionally match a sample of infrared-selected young stellar objects, identified by combining the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire, Wide-field Infrared Survey Explorer and Herschel Space Observatory Herschel infrared Galactic Plane Survey, to the dense clumps identified in the millimetre continuum by the Bolocam Galactic Plane Survey in two Galactic lines of sight centred towards l = 30° and 40°. We calculate the ratio of infrared luminosity, L<inf>IR</inf>, to the mass of the clump, M<inf>clump</inf>, in a variety of Galactic environments and find it to be somewhat enhanced in spiral arms compared to the interarm regions when averaged over kiloparsec scales. We find no compelling evidence that these changes are due to the mechanical influence of the spiral arm on the star formation efficiency rather than, e.g. different gradients in the star formation rate due to patchy or intermittent star formation, or local variations that are not averaged out due to small source samples. The largest variation in L<inf>IR</inf>/M<inf>clump</inf> is found in individual clump values, which follow a lognormal distribution and have a range of over three orders of magnitude. This spread is intrinsic as no dependence of L<inf>IR</inf>/M<inf>clump</inf> with M<inf>clump</inf> was found. No difference was found in the luminosity distribution of sources in the arm and interarm samples and a strong linear correlation was found between L<inf>IR</inf> and M<inf>clump</inf>. © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stv1323
Uncontrolled keywords: Galaxy: structure, Infrared: ISM, Radio continuum: ISM, Stars: formation
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 23 Nov 2015 17:13 UTC
Last Modified: 29 May 2019 16:27 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52184 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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