SiO maser survey of the Galactic disk IRAS sources.: III.: -10°<l<15° AND |b|≤3°, a central part of the Galaxy

被引:34
作者
Deguchi, S [1 ]
Fujii, T
Izumiura, H
Kameya, O
Nakada, Y
Nakashima, J
机构
[1] Natl Astron Observ, Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan
[2] Univ Tokyo, Fac Sci, Dept Astron, Bunkyo Ku, Tokyo 1130032, Japan
[3] Univ Tokyo, Fac Sci, Astron Inst, Kiso Observ, Tokyo 1818588, Japan
[4] Natl Astron Observ, Okayama Astrophys Observ, Okayama 7190232, Japan
[5] Natl Astron Observ, Mizusawa Astrogeodynam Observ, Mizusawa, Iwate 0230861, Japan
[6] Grad Univ Adv Studies, Dept Astron Sci, Nobeyama Radio Observ, Nagano 3841305, Japan
[7] Osaka Kyoiku Univ, Astron Inst, Osaka 5828582, Japan
关键词
circumstellar matter; Galaxy : kinematics and dynamics; masers; radio lines : stars; stars : late-type;
D O I
10.1086/317353
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A survey has been made in the SiO J = 1-0, nu = 1 and 2 transitions (similar to 43 GHz) for the color-selected IRAS sources in the central region of the Galaxy, -10 degrees < l < 15 degrees (except \l\ less than or equal to 3 degrees) and \b\ less than or equal to 3 degrees, with the Nobeyama 45 m telescope. We have detected 124 out of 200 observed sources in SiO masers. Distances to the sources range approximately from 2 to 11 kpc, if estimated from the IRAS 12 and 25 mum flux densities. Radial velocities of the detected sources spread between +/-260 km s(-1). The distribution of SiO sources in the longitude-velocity diagram is compared with the H I contours. A number of sources are out of the H I limiting velocities; a group of negative-velocity (similar to -200 to -80 km s(-1)) sources is found at l = 3 degrees -12 degrees region. The subsamples of sources exhibit negative and positive shifts of the average radial velocity depending on distance, suggesting evidence of a streaming motion of stars in the bulge bar.
引用
收藏
页码:351 / 379
页数:29
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