SiO maser survey of the galactic disk IRAS sources.: I.: 15° < l < 25°, near end of the Galactic bar

A survey has been made in the SiO J = 1-0, nu = 1 and 2 transitions (similar to 43 GHz) for the color-selected IRAS sources in the Galactic disk area of 15 degrees < l < 25 degrees and \b\ < 3 degrees with the Nobeyama 45 m telescope. We have detected 67 out of 119 observed sources in SiO masers. Distances to the sources are deduced by the IRAS 12 and 25 mu m flux densities and range approximately from 2 to 12 kpc. The lines of sight of this region cross the location of the near end of the bar in the Galaxy. Radial velocities of the detected sources spread between -100 and 200 km s(-1). This range slightly exceeds the possible limits expected from Galactic rotation. A comparison of the SiO with the CO and H I velocity-longitude (nu-l) diagrams reveals that the overall distribution of the SiO maser sources on the v-l diagram resembles the molecular ring feature. Observational data are compared with the theoretical results of the bar models.