SIMBAD references

2012MNRAS.421.3418H - Mon. Not. R. Astron. Soc., 421, 3418-3430 (2012/April-3)

The G305 star-forming complex: a wide-area radio survey of ultracompact H II regions.


Abstract (from CDS):

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 {x} 1.4 arcsec and sensitivity of ∼ 0.07 mJy/beam. 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 {x} 10–6 pc/cm6 and electron densities of 0.34–1.03 {x} 104/cm3. 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/yr.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: formation - ISM: clouds - H {sc ii} regions - radio continuum: galaxies - radio continuum: ISM

Nomenclature: Table 2: [HTU2012] NN (Nos 0-70).

Simbad objects: 83

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