SiO Maser Survey of Southern IRAS Sources
Abstract
We have surveyed 163 southern IRAS sources in the SiO J = 2 - 1 v = 1 maser line at 86 GHz, obtaining 38 (22 new and 16 previously known) detections. These detections include 6 stars not previously detected in OH 1612 MHz surveys, and 4 sources assigned incorrect OH radial velocities. The distance reachable in this survey turned out to be about 4 kpc. The local velocity dispersion near the Sun were found to be approximately 30 km s-1 for these IRAS/SiO sources. A relatively high concentration of the SiO detected sources were found at the area 320° < l < 340° (toward ``Norma tangent''). The estimated distances for these sources suggest that this concentration is spread between 2 and 6 kpc from the Sun, peaking on the Scutum-Crux arm.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- April 2001
- DOI:
- 10.1093/pasj/53.2.305
- Bibcode:
- 2001PASJ...53..305D
- Keywords:
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- GALAXY: KINEMATICS AND DYNAMICS;
- GALAXY: STRUCTURE;
- RADIO LINES: STARS;
- STARS: LATE-TYPE