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NAK03B - SiO Maser Survey of Cold IRAS Sources

Short title: Nakashima & Deguchi (2003B)
Authors: Nakashima, Jun-Ichi Deguchi, Shuji
Journal: Publications of the Astronomical Society of Japan, Vol.55, No.1, pp.229-246
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Target type: star

Abstract
We present the results of observations of cold IRAS sources in the Galactic disk area, -10 < l < 100 and b < 5, in the SiO J = 1 -- 0, v = 1 and 2 maser lines. SiO masers were detected in 51 out of 143 observed sources 45 were new detections in SiO masers. The selected IRAS sources were objects with dust temperatures of between 160 and 280K. According to a confirmation using 2MASS near-infrared images, a majority of the sample are AGB or post-AGB stars, although dense cores in the star-forming regions (or dusty H II regions) are involved in part of the sample. Among new detections, two were candidates for post-AGB stars: IRAS 18450 - 0148 (W43A), and 19312 + 1950. We found that the intensity ratios of the SiO J = 1 -- 0, v = 2 to the v = 1 line of the objects clearly correlate with those IRAS colors. The detection rates of SiO masers tend to increase toward the Galactic center as we ll as the cases of previous SiO maser surveys of typical AGB stars. No strong associations of the objects to the spiral arms were found. The radial-velocity dispersion of the present sample is comparable with the dispersion of the SiO maser sample of typical AGB stars. These facts suggest that the present sample of cold IRAS sources with SiO masers has a kinematic property very similar to that of typical AGB stars. eprintid: arXiv:astro-ph/0301372

Abstract

We present the results of observations of cold IRAS sources in the Galactic disk area, -10 < l < 100 and b < 5, in the SiO J = 1 -- 0, v = 1 and 2 maser lines. SiO masers were detected in 51 out of 143 observed sources 45 were new detections in SiO masers. The selected IRAS sources were objects with dust temperatures of between 160 and 280K. According to a confirmation using 2MASS near-infrared images, a majority of the sample are AGB or post-AGB stars, although dense cores in the star-forming regions (or dusty H II regions) are involved in part of the sample. Among new detections, two were candidates for post-AGB stars: IRAS 18450 - 0148 (W43A), and 19312 + 1950. We found that the intensity ratios of the SiO J = 1 -- 0, v = 2 to the v = 1 line of the objects clearly correlate with those IRAS colors. The detection rates of SiO masers tend to increase toward the Galactic center as we ll as the cases of previous SiO maser surveys of typical AGB stars. No strong associations of the objects to the spiral arms were found. The radial-velocity dispersion of the present sample is comparable with the dispersion of the SiO maser sample of typical AGB stars. These facts suggest that the present sample of cold IRAS sources with SiO masers has a kinematic property very similar to that of typical AGB stars. eprintid: arXiv:astro-ph/0301372

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Detection table from Nakashima & Deguchi (2003B)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	F_peak	∫F dv	RMS	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			H₂O	(km/s)	(Jy)	(Jy*km/s)	(Jy)		Yes/No		(kpc)
1	19 09 19	+09 21 09	43.2840	0.3246	G43.285+0.324	19069+0916	22 GHz;	10.7	7.217	808.564	0.152	ENG_H2O	+H₂O +OH +SiO	GALAXY		NAK03B
2	19 09 7.2	+08 16 31	42.3057	-0.1291	G42.308-0.132	19067+0811	22 GHz;	76.7	3.853	195.023	0.164	ENG_H2O	+H₂O +OH +SiO	EVOLVED		NAK03B
3	19 33 24.2	+19 56 55	55.3705	0.1856	G55.371+0.185	19312+1950	22 GHz;	17.4	7.251	171.407	0.192	ENG_H2O	+H₂O +CH₃OH I -CH₃OH II +OH +SiO	SFR_MIXED		NAK03B

Non-detection table from Nakashima & Deguchi (2003B)