Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012mnras.421.3418h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 421, Issue 4, pp. 3418-3430.
Astronomy and Astrophysics
Astronomy
Stars: Formation, Ism: Clouds, H Ii Regions, Radio Continuum: Galaxies, Radio Continuum: Ism
Scientific paper
We present wide-area radio continuum 5.5 and 8.8 GHz (5.5 and 3.4 cm) 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) H II regions. Observations presented here encompass the entire complex and have a maximum resolution of ˜ 1.5 × 1.4 arcsec and sensitivity of ˜0.07 mJy beam-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 UC H II regions. The physical properties of these candidate UC H II regions are determined and reveal that five candidates have peak properties consistent with known UC H II regions with source radii ranging from 0.04 to 0.1 pc, emission measures from 2.56 to 10.3 × 10-6 pc cm-6 and electron densities of 0.34-1.03 × 104 cm-3. We comment on these sites of recent massive star formation within G305 and by comparing to other star formation tracers (masers, NH3 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 ˜0.003 M&sun; yr-1.
Clark Simon J.
Davies Ben
Faimali A.
Hindson Luke
Thompson Maggie A.
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