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The statistics of triggered star formation: An overdensity of massive young stellar objects around Spitzer bubbles

Thompson, M.A., Urquhart, J.S., Moore, T.J.T., Morgan, L.K. (2012) The statistics of triggered star formation: An overdensity of massive young stellar objects around Spitzer bubbles. Monthly Notices of the Royal Astronomical Society, 421 (1). pp. 408-418. ISSN 0035-8711. (doi:10.1111/j.1365-2966.2011.20315.x) (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) (KAR id:52213)

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://dx.doi.org/10.1111/j.1365-2966.2011.20315.x

Abstract

We present a detailed statistical study of massive star formation in the environment of 322 Spitzer mid-infrared bubbles by using the Red MSX Source (RMS) survey for massive young stellar objects (YSOs). Using a combination of simple surface density plots and a more sophisticated angular cross-correlation function analysis, we show that there is a statistically significant overdensity of RMS YSOs towards the bubbles. There is a clear peak in the surface density and angular cross-correlation function of YSOs projected against the rim of the bubbles. By investigating the autocorrelation function of the RMS YSOs, we show that this is not due to intrinsic clustering of the RMS YSO sample. RMS YSOs and Spitzer bubbles are essentially uncorrelated with each other beyond a normalized angular distance of two bubble radii. The bubbles associated with RMS YSOs tend to be both smaller and thinner than those that are not associated with YSOs. We interpret this tendency to be due to an age effect, with YSOs being preferentially found around smaller and younger bubbles. We find no evidence to suggest that the YSOs associated with the bubbles are any more luminous than the rest of the RMS YSO population, which suggests that the triggering process does not produce a top-heavy luminosity function or initial mass function. We suggest that it is likely that the YSOs were triggered by the expansion of the bubbles and estimate that the fraction of massive stars in the Milky Way formed by this process could be between 14 and 30per cent.

Item Type: Article
DOI/Identification number: 10.1111/j.1365-2966.2011.20315.x
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Mon. Not. R. Astron. Soc. [Field not mapped to EPrints] AD - Centre for Astrophysics Research Science and Technology Research Institute, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, United Kingdom [Field not mapped to EPrints] AD - Australia Telescope National Facility, CSIRO Astronomy and Space Science, Po Box 76, Epping NSW 1710, Australia [Field not mapped to EPrints] AD - Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany [Field not mapped to EPrints] AD - Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Hii regions, Infrared: ISM, ISM: bubbles, 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: 30 Nov 2015 15:45 UTC
Last Modified: 29 May 2019 16:28 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52213 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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