Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...0031409d&link_type=abstract
Journal Article, Toward a New Millennium in Galaxy Morphology
Astronomy and Astrophysics
Astronomy
Radial Velocity, Galaxies, Galactic Structure, Star Distribution, Velocity Distribution, Kinematics, Least Squares Method, Infrared Astronomy Satellite, Silicon Oxides, Masers
Scientific paper
A survey has been made in the SiO J =1-0, v =1 and 2 transitions (approx. 43 GHz) for the color-selected IRAS (Infrared Astronomy Satellite) sources in the central part of the Galaxy, -10 deg. less than l less than 40 deg. and absolute value of b less than or equal to 3 deg. with the Nobeyama 45-m telescope. We have detected 338 out of 622 observed sources in SiO masers. Distances to the sources range approximately from 2 kpc to 13 kpc (estimated from the IRAS 12 and 25 micrometer flux densities). Radial velocities of the detected sources spread between -310 km per second and 300 km per second. The subsets of sources in -10 deg., less than l less than 15 deg, which are divided by distance exhibit a systematic velocity shift with distance, suggesting evidence of noncircular motions of stars along the bulge bar.
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