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

Abstract

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.

Accepted by The Astronomical Journal Supplement Series

References in corpus (3)

• Imaging the Ionized Disk of the High-Mass Protostar Orion-I
• An equatorial wind from the massive young stellar object S140 IRS 1
• A rotating disk around the very young massive star AFGL 490

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• ALMA Imaging of Millimeter/Submillimeter Continuum Emission in Orion KL
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• From dusty filaments to massive stars: The case of NGC 7538 S
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• ALMA Observation of the 658 GHz Vibrationally Excited H${}_2$O Maser in Orion KL Source I
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