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The G305 star-forming complex: Embedded massive star formation discovered by Herschel Hi-GAL

Faimali, A., Thompson, M.A., Hindson, L., Urquhart, J.S., Pestalozzi, M., Carey, S., Shenoy, S., Veneziani, M., Molinari, S., Clark, J.S. and others. (2012) The G305 star-forming complex: Embedded massive star formation discovered by Herschel Hi-GAL. Monthly Notices of the Royal Astronomical Society, 426 (1). pp. 402-415. ISSN 0035-8711. (doi:10.1111/j.1365-2966.2012.21765.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)

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.1365-2966.2012.21765.x

Abstract

We present a Herschel far-infrared study towards the rich massive star-forming complex G305, utilizing PACS 70, 160?m and SPIRE 250, 350, and 500?m observations from the Hi-GAL survey of the Galactic plane. The focus of this study is to identify the embedded massive star-forming population within G305, by combining far-infrared data with radio continuum, H 2O maser, methanol maser, MIPS and Red MSX Source survey data available from previous studies. By applying a frequentist technique we are able to identify a sample of the most likely associations within our multiwavelength data set, which can then be identified from the derived properties obtained from fitted spectral energy distributions (SEDs). By SED modelling using both a simple modified blackbody and fitting to a comprehensive grid of model SEDs, some 16 candidate associations are identified as embedded massive star-forming regions. We derive a two-selection colour criterion from this sample of log(F 70/F 500)?1 and log(F 160/F 350)?1.6 to identify an additional 31 embedded massive star candidates with no associated star formation tracers. Using this result we can build a picture of the present-day star formation of the complex, and by extrapolating an initial mass function, suggest a current population of ?2×10 4 young stellar objects (YSOs) present, corresponding to a star formation rate (SFR) of 0.01-0.02M ?yr -1. Comparing this resolved SFR, to extragalactic SFR tracers (based on the Kennicutt-Schmidt relation), we find that the star formation activity is underestimated by a factor of ?2 in comparison to the SFR derived from the YSO population.

Item Type: Article
DOI/Identification number: 10.1111/j.1365-2966.2012.21765.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, Hatfield AL10 9AB, United Kingdom [Field not mapped to EPrints] AD - ATNF, 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, Bonn, 53121, Germany [Field not mapped to EPrints] AD - Instituto di Fisica dello Spazio Interplanetario, CNR, Via Fosso del Cavaliere, Roma, I-00133, Italy [Field not mapped to EPrints] AD - Spitzer Science Center, California Institute of Technology, M/S 220-6, 1200 E. California Blvd., Pasadena, CA, 91125, United States [Field not mapped to EPrints] AD - Space Science Division, NASA Ames Research Center, M/S 245-6, Moffett Field, CA, 94035, United States [Field not mapped to EPrints] AD - Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Formation, Hii regions, Infrared, ISM, Methods, Stars, Statistical
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 15:00 UTC
Last Modified: 29 May 2019 16:28 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52208 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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