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SHI97 - SiO Maser Sources toward the Sagittarius B2 Molecular Cloud

Short title: Shiki & Deguchi (1997)
Authors: Shiki, Shigetomo Deguchi, Shuji
Journal: The Astrophysical Journal, Volume 478, Issue 1, pp. 206-210.
Bibcode:

Abstract
We have detected six new SiO maser sources toward the Sagittarius B2 molecular cloud. One is identified with an OH 1612 MHz maser source that was previously found by the VLA, and another associated with an IRAS source. The other four sources are not associated with any known OH/IR or IRAS sources. The spatial density and the kinematic property for these sources are found to be similar to those of the OH/IR sources near the Galactic center. This fact suggests that they are mostly stellar SiO maser sources in front of (or behind) the Sgr B2 molecular cloud. A possibility of association with young stellar objects, however, cannot be completely ruled out for the one SiO source (17450-2808) that is associated with an IRAS source exhibiting infrared colors of young objects.

Abstract

We have detected six new SiO maser sources toward the Sagittarius B2 molecular cloud. One is identified with an OH 1612 MHz maser source that was previously found by the VLA, and another associated with an IRAS source. The other four sources are not associated with any known OH/IR or IRAS sources. The spatial density and the kinematic property for these sources are found to be similar to those of the OH/IR sources near the Galactic center. This fact suggests that they are mostly stellar SiO maser sources in front of (or behind) the Sgr B2 molecular cloud. A possibility of association with young stellar objects, however, cannot be completely ruled out for the one SiO source (17450-2808) that is associated with an IRAS source exhibiting infrared colors of young objects.

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Detection table from Shiki & Deguchi (1997)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Spectra	Line	V_range	V_peak	F_peak	∫F dv	Telescope	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(deg.)	(deg.)				SiO	(km/s)	(km/s)	(Jy)	(Jy*km/s)		Yes/No		(kpc)
1	17 46 56.3	-28 31 09	0.5065	-0.0301	G0.5065-0.0301	1	Spectra	SiO J=1-0 v=1;	7.8*	56.5	1.4	-1.29*	NRO	+SiO	SFR_MIXED
2	17 46 56.3	-28 31 09	0.5065	-0.0301	G0.5065-0.0301	1	Spectra	SiO J=1-0 v=2;	4.9*	56.6	2.1	-0.89*	NRO	+SiO	SFR_MIXED
3	17 47 8.5	-28 29 48.1	0.5488	-0.0566	G0.5488-0.0566	2	Spectra	SiO J=1-0 v=1;	11.1*	-25.7	36.6	-22.58*	NRO	+H₂O +OH +SiO	SFR_MIXED
4	17 47 8.5	-28 29 48.1	0.5488	-0.0566	G0.5488-0.0566	2	Spectra	SiO J=1-0 v=2;	14.0*	-25.7	34.3	-29.02*	NRO	+H₂O +OH +SiO	SFR_MIXED
5	17 47 20.4	-28 23 7.3	0.6667	-0.0363	G0.6667-0.0344	3	Spectra	SiO J=1-0 v=1;	13.6*	-23.2	6.2	-6.63*	NRO	+H₂O +CH₃OH I +CH₃OH II -OH	SFR
	17 47 20.4	-28 23 7.3	0.6667	-0.0363	G0.6667-0.0344	3		SiO J=1-0 v=1;		82.3	3.5		NRO	+H₂O +CH₃OH I +CH₃OH II -OH	SFR
	17 47 20.4	-28 23 7.3	0.6667	-0.0363	G0.6667-0.0344	3		SiO J=1-0 v=1;		86.5	4.55		NRO	+H₂O +CH₃OH I +CH₃OH II -OH	SFR
	17 47 20.4	-28 23 7.3	0.6667	-0.0363	G0.6667-0.0344	3		SiO J=1-0 v=1;		93	2.6		NRO	+H₂O +CH₃OH I +CH₃OH II -OH	SFR
9	17 47 20.4	-28 23 7.3	0.6667	-0.0363	G0.6667-0.0344	3	Spectra	SiO J=1-0 v=2;		-23.1	11.6		NRO	+H₂O +CH₃OH I +CH₃OH II -OH	SFR
10	17 48 11.8	-28 18 23.5	0.8316	-0.1568	G0.8316-0.1568	4	Spectra	SiO J=1-0 v=1;	211.2*	80.9	2.4	-0.63*	NRO	+SiO	SFR
11	17 48 11.8	-28 18 23.5	0.8316	-0.1568	G0.8316-0.1568	4	Spectra	SiO J=1-0 v=2;	1.1*	78.9	2.2	-0.61*	NRO	+SiO	SFR
12	17 48 23.9	-28 20 2.6	0.8310	-0.2092	G0.831-0.209	5	Spectra	SiO J=1-0 v=1;	1.0*	81	2.3	-0.56*	NRO	-CH₃OH I -CH₃OH II +SiO	SFR
13	17 48 23.9	-28 20 2.6	0.8310	-0.2092	G0.831-0.209	5	Spectra	SiO J=1-0 v=2;	1.4*	80.7	1.8	-0.78*	NRO	-CH₃OH I -CH₃OH II +SiO	SFR
14	17 48 14.5	-28 09 3.3	0.9699	-0.0848	G0.9699-0.0848	6	Spectra	SiO J=1-0 v=1;	0.6*	101.2	3.5	-0.26*	NRO	+SiO	SFR_MIXED
15	17 48 14.5	-28 09 3.3	0.9699	-0.0848	G0.9699-0.0848	6	Spectra	SiO J=1-0 v=2;	1.5*	101.2	2	-0.73*	NRO	+SiO	SFR_MIXED
16	17 48 12.7	-28 19 43.4	0.8144	-0.1712	G0.8144-0.1712	7	Spectra	SiO J=1-0 v=1;	3.4*	-38.7	1.2	-1.01*	NRO	+SiO	EVOLVED
	17 48 12.7	-28 19 43.4	0.8144	-0.1712	G0.8144-0.1712	7		SiO J=1-0 v=1;		-36.2	2.1		NRO	+SiO	EVOLVED

Non-detection table from Shiki & Deguchi (1997)