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

A survey has been made in the SiO J = 1-0, nu = 1 and 2 transitions (simila r 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 t elescope. We have detected 67 out of 119 observed sources in SiO masers. Di stances to the sources are deduced by the IRAS 12 and 25 mu m flux densitie s and range approximately from 2 to 12 kpc. The lines of sight of this regi on cross the location of the near end of the bar in the Galaxy. Radial velo cities of the detected sources spread between -100 and 200 km s(-1). This r ange slightly exceeds the possible limits expected from Galactic rotation. A comparison of the SiO with the CO and H I velocity-longitude (nu-l) diagr ams reveals that the overall distribution of the SiO maser sources on the v -l diagram resembles the molecular ring feature. Observational data are com pared with the theoretical results of the bar models.