The RMS Survey: Radio observations of candidate massive YSOs in the southern hemisphere

Abstract

The Red MSX Source (RMS) survey is a multi-wavelength program of follow-up observations designed to distinguish between genuine massive young stellar objects (MYSOs) and other embedded or dusty objects, such as ultra compact (UC) HII regions, evolved stars and planetary nebulae (PNe). We have identified nearly 2000 massive YSOs candidates by comparing the colours of MSX and 2MASS point sources to those of known MYSOs. Unfortunately, there are several other types of embedded or dust enshrouded objects that have similar colours as MYSOs and contaminate our sample. Two sources of contamination are from UCHII regions and PNe, both of which can be identified from the radio emission emitted by their ionised nebulae. In order to identify UCHII regions and PNe that contaminate our sample we have conducted high resolution radio continuum observations at 3.6 and 6 cm of all southern MYSOs candidates ($235<l<350$) using the Australia Telescope Compact Array (ATCA). These observations have a spatial resolution of $\sim$1--2\arcsec and typical image rms noise values of $\sim$0.3 mJy -- sensitive enough to detect a B0.5 star at the far side of the Galaxy. Of the 826 RMS sources observed we found 199 to be associated with radio emission, $\sim$25% of the sample. More significant than those sources associated with radio emission are the 627 RMS sources for which no radio emission was detected as these sources are still potential MYSOs. The Galactic distribution, morphologies and spectral indices of the radio sources associated with the RMS sources are consistent with these sources being UCHII regions. In addition to the 826 RMS sources observed we present observations of a further 190 fields. These observations were made towards MSX sources that passed cuts in earlier versions of the survey, but were later excluded.

arXiv comment19 pages. full versions of figs. 3, 7 and 8 and tables 3 and 6 are available at http://www.ast.leeds.ac.uk/~jsu/. Accepted to A&A

References in corpus (11)

• High-Mass Proto-Stellar Candidates - I : The Sample and Initial Results
• First GLIMPSE Results on the Stellar Structure of the Galaxy
• A study of high velocity molecular outflows with an up-to-date sample
• The Population of the Galactic Plane as Seen by MSX
• A SCUBA imaging survey of ultracompact HII regions: The environments of massive star formation
• A New Catalog of Radio Compact HII Regions in the Milky Way
• Resolving the Kinematic Distance Ambiguity of Southern Massive Young Stellar Object Candidates
• Morphologies of Ultracompact HII Regions in W49A and Sgr B2: Prevalence of Shells and a Modified Classification Scheme
• Extended emission associated with young HII regions
• A New Radio Catalog of Compact HII Regions in the Milky Way II. The 1.4 GHz Data
• Mid-Infrared Detection of a Hot Molecular Core in G29.96-0.02

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