SiO maser survey towards the stellar cluster at the Galactic center

Details SiO maser survey towards the stellar cluster at the Galactic center SiO maser survey towards the stellar cluster at the Galactic center

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..373i&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

Masers, Long Period Variables, Dynamics Of The Galaxy

Scientific paper

We report preliminary results of a long-term survey of SiO v=1 and v=2 J=1-0 masers towards 418 large-amplitude variables within 15' of the Galactic center with the Nobeyama 45-m telescope. We have detected 194 masers out of 338 surveyed fields during 2001-2002. The averaged detection rate of 57% is comparable with that obtained towards IRAS point sources in the Galactic bulge. The detection rate increases clearly with the stellar pulsation periods. The Galactic longtiude-radial velocity diagram of the SiO sources revealed is quite similar to that of OH masers. A hole in the diagram indicates the presence of the non-circular streaming motions of stars in the nuclear disk of the Galaxy.

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