Detection of SiO and H2O masers in Galactic bulge sources

Details Detection of SiO and H2O masers in Galactic bulge sources Detection of SiO and H2O masers in Galactic bulge sources

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..179n&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 2, p. 179-189.

Astronomy and Astrophysics

Astronomy

24

Galactic Bulge, Infrared Astronomy Satellite, Silicon Oxides, Water Masers, Galactic Rotation, Line Spectra

Scientific paper

We present the results of the first survey of Galactic bulge objects by the SiO J = 1-0 and H2O 616 - 523 transitions. The sources were selected from the IRAS Point Source Catalog with 12 micron intensity less than 14 Jy and colors, between 0 and 0.2, extracting dust enshrouded objects at a distance of 8 kpc. Twenty three IRAS sources were observed; SiO masers were detected in fifteen objects, and H2O in six sources. The overall properties of maser emission for bulge IRAS sources indicate that they are low-mass stars as optical Mira variables. The high detection rate of SiO masers in bulge objects seems to be due to the high sensitivity of the telescope used. The radial velocities of the maser lines reveal the average rotation of the bulge with a rotation velocity of 10 km/s/deg.

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