Radio Observations Of The HII Region Complex RCW 95

Details Radio Observations Of The HII Region Complex RCW 95 Radio Observations Of The HII Region Complex RCW 95

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..28b&link_type=abstract

Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech

Astronomy and Astrophysics

Astronomy

Scientific paper

In this work we studied the complex of compact HII regions RCW 95. The cloud was mapped on the radio continuum emission at 43 GHz; a survey of water lines was also conducted at 22 GHz. The observations were made with the 14-meter single-dish antennae of the Itapetinga radio observatory in Brazil, with 2' resolution at 43 GHz. For the continuum observations we made several scans in right ascension throughout the whole of the source spaced by 1' in declination, and with 45' extension in RA to allow for baseline correction. The study resulted on the identification of resolved radio continuum sources associated with all the three IRAS sources in the region: IRAS 15408-5356, 15411-5352 and 15412-5359, all with far-IR colours characteristics of CHII regions. The water line survey resulted on the positive identification of maser emission associated with the three IRAS sources, supporting the evidences for these regions to harbour massive young stars. Two other unresolved HII regions, not associated with far-IR sources, were also discovered through detailed analysis of the profiles of the radio continuum scans. Whilst the stellar content of the IRAS sources 15408-5356 and 15411-5352 have been previously studied in the near-IR (Roman-Lopes & Abraham 2004 and 2006), the stellar population associated to IRAS 15412-5359 was first studied in the near and middle-IR by us, motivated by the results obtained in radio. We used photometric data from 1 to 8 μm from 2MASS and SPITZER and identified a significant population of massive stars, including one O9V and some early-BV stars, that explain the ionization of the source.

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