Abstract
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 Galactic disk area of 15° < l < 25° and \b\ < 3° 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 μm 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 (v-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.
Original language | English |
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Pages (from-to) | 257-276 |
Number of pages | 20 |
Journal | Astrophysical Journal, Supplement Series |
Volume | 125 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1999 Nov |
Keywords
- ISM: kinematics and dynamics
- ISM: molecules
- Masers
- Radio continuum: ISM
- Surveys
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science