Skip to main content

The G305 star-forming complex: A wide-area radio survey of ultracompact Hii regions

Hindson, L., Thompson, M.A., Urquhart, J.S., Faimali, A., Clark, J.S., Davies, B. (2012) The G305 star-forming complex: A wide-area radio survey of ultracompact Hii regions. Monthly Notices of the Royal Astronomical Society, 421 (4). pp. 3418-3430. ISSN 0035-8711. (doi:10.1111/j.1365-2966.2012.20567.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.1365-2966.2012.20567.x

Abstract

We present wide-area radio continuum 5.5 and 8.8GHz (5.5 and 3.4cm) Australia Telescope Compact Array observations of the complex and rich massive star-forming region G305. The aim of this study is to perform an un-targeted survey of the region in search of the compact radio emission associated with ultracompact (UC) Hii regions. Observations presented here encompass the entire complex and have a maximum resolution of ? 1.5 × 1.4 arcsec and sensitivity of ?0.07mJybeam -1. By applying a data reduction method that emphasizes small-scale structure, we are able to detect 71 compact radio sources distributed throughout the observed field. To explore the nature of these compact radio sources we compare to mid-infrared data and in this way identify 56 background sources, eight stellar radio sources, a single bright-rimmed cloud and six candidate UCHii regions. The physical properties of these candidate UCHii regions are determined and reveal that five candidates have peak properties consistent with known UCHii regions with source radii ranging from 0.04 to 0.1pc, emission measures from 2.56 to 10.3×10 -6pc cm -6 and electron densities of 0.34-1.03 × 10 4cm -3. We comment on these sites of recent massive star formation within G305 and by comparing to other star formation tracers (masers, NH 3 and young stellar objects) build a picture of the star formation history of the region. Using these results we estimate a lower limit to the star formation rate for the region of ?0.003M ?yr -1.

Item Type: Article
DOI/Identification number: 10.1111/j.1365-2966.2012.20567.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 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, 53121 Bonn, Germany [Field not mapped to EPrints] AD - Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom [Field not mapped to EPrints] AD - Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom [Field not mapped to EPrints] AD - School of Physics and Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Hii regions, ISM: clouds, Radio continuum: galaxies, 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: 30 Nov 2015 15:14 UTC
Last Modified: 29 May 2019 16:28 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52211 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
  • Depositors only (login required):