High Resolution Observations of H2O MASERs in BRCs

Details High Resolution Observations of H2O MASERs in BRCs High Resolution Observations of H2O MASERs in BRCs

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20718406m&link_type=abstract

American Astronomical Society Meeting 207, #184.06; Bulletin of the American Astronomical Society, Vol. 37, p.1472

Astronomy and Astrophysics

Astronomy

Scientific paper

Bright Rim Clouds (BRCs) are clouds that have been compressed by an external ionization-shock front which focuses the neutral gas into compact globules. The boundary layer between the neutral gas and the gas ionized by the incident photons is often called ``bright rim" but the clumps are sometimes classified also as speck globules or cometary globules depending on their appearance. Small globules with bright rims have been considered to be potential sites of low mass star formation and have been studied in several regions, as in Orion and M17. Some systematic surveys of bright-rimmed clouds associated with IRAS point sources have been made searching for new candidates of recent star formation. For some objects in the northern sky, evidence has been found for the presence of small clusters of embedded sources of intermediate and high-far-infrared luminosity (LFIR>102 L&sun;). We present the first VLA observations which have detected H2O maser emission towards 3 sources. The low detection rate seems to support the idea that BRCs produce mostly low-luminosity objects, for which maser emission is weak and episodic, and that the embedded sources are in a more advanced evolutionary phase.

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