SiO Maser Survey of the Galactic Disk IRAS Sources. III. −10o< l <15o and | b |≤3o, a Central Part of the Galaxy

A survey has been made in the SiO J = 1-0, v = 1 and 2 transitions (∼43 GHz) for the color-selected IRAS sources in the central region of the Galaxy, -10° < l < 15° (except | l | ≤ 3°) and | b | ≤ 3°, with the Nobeyama 45 m telescope. We have detected 124 out of 200 observed sources in SiO masers. Distances to the sources range approximately from 2 to 11 kpc, if estimated from the IRAS 12 and 25 μm flux densities. Radial velocities of the detected sources spread between ±260 km s -1 . The distribution of SiO sources in the longitude-velocity diagram is compared with the H I contours. A number of sources are out of the H I limiting velocities; a group of negative-velocity (∼-200 to -80 km s -1 ) sources is found at l = 3°-12° region. The subsamples of sources exhibit negative and positive shifts of the average radial velocity depending on distance, suggesting evidence of a streaming motion of stars in the bulge bar.