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

Hideyuki Izumiura, Shuji Deguchi, Takahiro Fujii, Osamu Kameya, Shigeru Matsumoto, Yoshikazu Nakada, Takafumi Ootsubo, Nobuharu Ukita

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30 Citations (Scopus)


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 languageEnglish
Pages (from-to)257-276
Number of pages20
JournalAstrophysical Journal, Supplement Series
Issue number1
Publication statusPublished - 1999 Nov


  • ISM: kinematics and dynamics
  • ISM: molecules
  • Masers
  • Radio continuum: ISM
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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