Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..815j&link_type=abstract
Publications of the Astronomical Society of Japan, v.47, p.815-827.
Astronomy and Astrophysics
Astronomy
19
Galaxy : Bulge, Galaxy : Structure, Iras Sources, Masers
Scientific paper
The statistical properties of SiO masers were studied based on observations of color-selected IRAS sources in the direction of the Galactic bulge. Among 313 observed late-type stellar objects in the region of |l| < 15(deg) and 3(deg) < |b| <10(deg) , 193 were detected in the SiO v=1, J=1--0 line and/or the v=2, J=1--0 line. We discuss the relation between the SiO detection rate and the infrared properties for these sources. The sources were divided into bulge and disk members in terms of the luminosity distance. The SiO detection rate was found to be appreciably higher for the bulge sources than for the disk sources, and the detection rate was found to be higher for variable IRAS sources (with IRAS variability index above 90) than for the nonvariable sources (with an index below 90). We also found that the center velocities of the v=1 and v=2, J=1--0 lines are almost equal to the average velocity of the OH 1612 MHz double peaks. This implies that the SiO velocity is a good indicator of the stellar radial velocity, suggesting that an analysis of bulge stellar kinematics using SiO radial velocities is reasonable. On the average, the line-intensity ratio of the v=1 to v=2 lines is approximately unity, and there seems to be no systematic difference in the ratio between disk and bulge sources. The SiO line intensities are very weakly correlated with the IRAS fluxes for bulge sources. No clear correlation has been found between the SiO line width and the stellar expansion velocity. This indicates that the SiO line width cannot be used as a measure of the luminosity of infrared sources.
Deguchi Shuji
Izumiura Hideyuki
Jiang Bi-Wei
Nakada Yoshikazu
Yamamura Issei
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