An Extensive, Sensitive Search for SiO Masers in High- and Intermediate-Mass Star-Forming Regions

Details An Extensive, Sensitive Search for SiO Masers in High- and Intermediate-Mass Star-Forming Regions An Extensive, Sensitive Search for SiO Masers in High- and Intermediate-Mass Star-Forming Regions

2008-08-23

arxiv.org/abs/0808.3190v1

Astronomy and Astrophysics

Astrophysics

Accepted by The Astronomical Journal Supplement Series

Scientific paper

10.1088/0004-637X/691/1/332

We present sensitive Very Large Array observations with an angular resolution of a few arcseconds of the $J= 1 - 0$ line of SiO in the $v$=1 and 2 vibrationally excited states toward a sample of 60 Galactic regions in which stars of high or intermediate mass are currently forming and/or have recently formed. We report the detection of SiO maser emission in \textit{both} vibrationally excited transitions toward only three very luminous regions: Orion-KL, W51N and Sgr B2(M). Toward all three, SiO maser emission had previously been reported, in Orion-KL in both lines, in W51N only in the $v=2$ line and in Sgr B2(M) only in the $v=1$ line. Our work confirms that SiO maser emission in star-forming regions is a rare phenomenon, indeed, that requires special, probably extreme, physical and chemical conditions not commonly found. In addition to this SiO maser survey, we also present images of the simultaneously observed 7 mm continuum emission from a subset of our sample of star-forming regions where such emission was detected. This is in most cases likely to be free-free emission from compact- and ultracompact-HII regions.

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