Detections of SiO masers from the large-amplitude variables in the Galactic Nuclear Disk

Hiroshi Imai; Shuji Deguchi; Takahiro Fujii; Ian S. Glass; Yoshifusa Ita; Hideyuki Izumiura; Osamu Kameya; Atsushi Miyazaki; Yoshikazu Nakada; Jun Ichi Nakashima

doi:10.1093/pasj/54.2.L19

Detections of SiO masers from the large-amplitude variables in the Galactic Nuclear Disk

Hiroshi Imai, Shuji Deguchi, Takahiro Fujii, Ian S. Glass, Yoshifusa Ita, Hideyuki Izumiura, Osamu Kameya, Atsushi Miyazaki, Yoshikazu Nakada, Jun Ichi Nakashima

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We have surveyed known large-amplitude variables within 15' of the Galactic center in the SiO J = 1-0 v = 1 and 2 maser lines at 43 GHz, resulting in 79 detections and 58 non-detections. The detection rate of 58 percent is comparable to that obtained in Bulge IRAS source surveys. SiO lines were also detected from four other sources near the program objects. The SiO detection rate increases steeply with the period, particularly for stars with P > 500d, where it exceeds 80%. We found at a given period that the SiO detection rate is approximately double that for OH. These facts suggest that the large-amplitude variables in the Nuclear Disk region are AGB stars similar in their overall properties to the inner and outer bulge IRAS/SiO sources.

Original language	English
Pages (from-to)	L19-L22
Journal	Publications of the Astronomical Society of Japan
Volume	54
Issue number	2
DOIs	https://doi.org/10.1093/pasj/54.2.L19
Publication status	Published - 2002

Keywords

Galaxy: center, kinematics and dynamics
Masers
Stars: AGB and post-AGB

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Detections of SiO masers from the large-amplitude variables in the Galactic Nuclear Disk. / Imai, Hiroshi; Deguchi, Shuji; Fujii, Takahiro; Glass, Ian S.; Ita, Yoshifusa; Izumiura, Hideyuki; Kameya, Osamu; Miyazaki, Atsushi; Nakada, Yoshikazu; Nakashima, Jun Ichi.

In: Publications of the Astronomical Society of Japan, Vol. 54, No. 2, 2002, p. L19-L22.

Research output: Contribution to journal › Article › peer-review

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abstract = "We have surveyed known large-amplitude variables within 15' of the Galactic center in the SiO J = 1-0 v = 1 and 2 maser lines at 43 GHz, resulting in 79 detections and 58 non-detections. The detection rate of 58 percent is comparable to that obtained in Bulge IRAS source surveys. SiO lines were also detected from four other sources near the program objects. The SiO detection rate increases steeply with the period, particularly for stars with P > 500d, where it exceeds 80%. We found at a given period that the SiO detection rate is approximately double that for OH. These facts suggest that the large-amplitude variables in the Nuclear Disk region are AGB stars similar in their overall properties to the inner and outer bulge IRAS/SiO sources.",

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AU - Imai, Hiroshi

AU - Deguchi, Shuji

AU - Fujii, Takahiro

AU - Glass, Ian S.

AU - Ita, Yoshifusa

AU - Izumiura, Hideyuki

AU - Kameya, Osamu

AU - Miyazaki, Atsushi

AU - Nakada, Yoshikazu

AU - Nakashima, Jun Ichi

PY - 2002

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N2 - We have surveyed known large-amplitude variables within 15' of the Galactic center in the SiO J = 1-0 v = 1 and 2 maser lines at 43 GHz, resulting in 79 detections and 58 non-detections. The detection rate of 58 percent is comparable to that obtained in Bulge IRAS source surveys. SiO lines were also detected from four other sources near the program objects. The SiO detection rate increases steeply with the period, particularly for stars with P > 500d, where it exceeds 80%. We found at a given period that the SiO detection rate is approximately double that for OH. These facts suggest that the large-amplitude variables in the Nuclear Disk region are AGB stars similar in their overall properties to the inner and outer bulge IRAS/SiO sources.

AB - We have surveyed known large-amplitude variables within 15' of the Galactic center in the SiO J = 1-0 v = 1 and 2 maser lines at 43 GHz, resulting in 79 detections and 58 non-detections. The detection rate of 58 percent is comparable to that obtained in Bulge IRAS source surveys. SiO lines were also detected from four other sources near the program objects. The SiO detection rate increases steeply with the period, particularly for stars with P > 500d, where it exceeds 80%. We found at a given period that the SiO detection rate is approximately double that for OH. These facts suggest that the large-amplitude variables in the Nuclear Disk region are AGB stars similar in their overall properties to the inner and outer bulge IRAS/SiO sources.

KW - Galaxy: center, kinematics and dynamics

KW - Masers

KW - Stars: AGB and post-AGB

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