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MIY01 - SiO Maser Survey in the Galactic Center Region with a Multi-Beam Receiver

Short title: Miyazaki et al. (2001)
Authors: Miyazaki, Atsushi Deguchi, Shuji Tsuboi, Masato Kasuga, Takashi Takano, Shuro
Journal: Publications of the Astronomical Society of Japan, vol.53, no. 3, p. 501-507
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Detection table: Show detection table (24 detection)

Abstract
We have made a wide-field survey of SiO masers in the 7' � 13' area around the Galactic center with the Nobeyama 45-m radio telescope using a 2 � 3 multi-beam SIS mixer receiver at 43 GHz. We detected 9 SiO maser sources (6 of them are new) newly detected 6 sources have been identified with Miras or OH 1612 MHz maser sources. The source surface number density, ~360 per square degree, found in this survey is slightly smaller than the number density of OH 1612 MHz sources in the same area. A least-squares analysis of the radial velocities of the detected sources has revealed a rapid rotation of the stars around the Galactic center. This implies that most of the objects detected in this survey belong to the nuclear disk near the Galactic center.

Abstract

We have made a wide-field survey of SiO masers in the 7' � 13' area around the Galactic center with the Nobeyama 45-m radio telescope using a 2 � 3 multi-beam SIS mixer receiver at 43 GHz. We detected 9 SiO maser sources (6 of them are new) newly detected 6 sources have been identified with Miras or OH 1612 MHz maser sources. The source surface number density, ~360 per square degree, found in this survey is slightly smaller than the number density of OH 1612 MHz sources in the same area. A least-squares analysis of the radial velocities of the detected sources has revealed a rapid rotation of the stars around the Galactic center. This implies that most of the objects detected in this survey belong to the nuclear disk near the Galactic center.

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Detection table from Miyazaki et al. (2001)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_range	V_peak	T_a	∫T_a dv	Telescope	RMS	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			SiO	(km/s)	(km/s)	(K)	(K*km/s)		(Jy)		Yes/No		(kpc)
1	17 45 30.8	-28 59 37.2	359.9388	-0.0101	G359.9380-0.0097	*IRAS 359.939-00.010		0.00	-73.7	1.56	47.899		0.252	ENG_SIO	+OH +SiO	SFR_MIXED		MIY01
2	17 45 31.9	-28 57 50.1	359.9662	0.0022	G359.9670+0.0022	*IRAS 359.966+00.002		0.00	-7.4	3.09	101.407		0.162	ENG_SIO	+SiO	SFR_MIXED		MIY01
3	17 45 38.5	-28 56 12.7	0.0019	-0.0044	G0.0030-0.0040	*IRAS 000.002-00.005		0.00	-6.6	0.93	48.762		0.171	ENG_SIO	+SiO	GALAXY		MIY01
4	17 45 40.1	-29 00 28.6	359.9443	-0.0465	G359.9444-0.0464	IRAS 359.944-00.047		0.00	-27.3	1.5	52.645		0.165	ENG_SIO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		MIY01
5	17 45 39.7	-28 59 51.6	359.9523	-0.0398	G359.9540-0.0405	*IRAS 359.953-00.040		0.00	71.5	1.74	54.803		0.153	ENG_SIO				MIY01
6	17 45 47.5	-28 53 10	0.0624	-0.0061	G0.0640-0.0061	*IRAS 000.062-00.006		0.00	21.8	1.17	46.604		0.147	ENG_SIO	+SiO	SFR_MIXED		MIY01
7	17 45 38.6	-28 56 12.7	0.0021	-0.0048	G0.0030-0.0040	SiO000.002-00.005	SiO J=1-0 v=1;		-6.6	0.31	1.13	NRO	0.057	NRO	+SiO	GALAXY		MIY01
8	17 45 38.6	-28 56 12.7	0.0021	-0.0048	G0.0030-0.0040	SiO000.002-00.005	SiO J=1-0 v=2;		-4.8	0.32	1.32	NRO	0.060	NRO	+SiO	GALAXY		MIY01
9	17 45 47.6	-28 53 10	0.0626	-0.0065	G0.0640-0.0061	SiO000.062-00.006	SiO J=1-0 v=1;		21.8	0.39	1.08	NRO	0.049	NRO	+SiO	SFR_MIXED		MIY01
10	17 45 47.6	-28 53 10	0.0626	-0.0065	G0.0640-0.0061	SiO000.062-00.006	SiO J=1-0 v=2;		21.8	0.3	0.79	NRO	0.052	NRO	+SiO	SFR_MIXED		MIY01
11	17 45 38.8	-29 02 27.7	359.9135	-0.0595	G359.9161-0.0667	SiO359.914-00.060	SiO J=1-0 v=1;		-309.1	0.51	1.33	NRO	0.062	NRO	+CH₃OH I +OH +SiO	SFR_MIXED		MIY01
12	17 45 38.8	-29 02 27.7	359.9135	-0.0595	G359.9161-0.0667	SiO359.914-00.060	SiO J=1-0 v=2;		-308.6	~ 0.35	0.77	NRO	0.073	NRO	+CH₃OH I +OH +SiO	SFR_MIXED		MIY01
13	17 45 41.6	-29 01 50.5	359.9276	-0.0628	G359.9276-0.0628	SiO359.928-00.063	SiO J=1-0 v=1;		-92.3	< 0.18	< 0.48	NRO	0.068	NRO	+SiO	SFR_MIXED		MIY01
14	17 45 41.6	-29 01 50.5	359.9276	-0.0628	G359.9276-0.0628	SiO359.928-00.063	SiO J=1-0 v=2;		-92.9	0.46	1.34	NRO	0.070	NRO	+SiO	SFR_MIXED		MIY01
15	17 45 30.9	-28 59 37.3	359.9390	-0.0104	G359.9380-0.0097	SiO359.939-00.010	SiO J=1-0 v=1;		-73.7	0.52	1.11	NRO	0.084	NRO	+OH +SiO	SFR_MIXED		MIY01
16	17 45 30.9	-28 59 37.3	359.9390	-0.0104	G359.9380-0.0097	SiO359.939-00.010	SiO J=1-0 v=2;		-73.5	0.52	1.11	NRO	0.082	NRO	+OH +SiO	SFR_MIXED		MIY01
17	17 45 40.2	-29 00 28.6	359.9445	-0.0468	G359.9444-0.0464	SiO359.944-00.047	SiO J=1-0 v=1;		-27.3	0.5	1.22	NRO	0.055	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		MIY01
18	17 45 40.2	-29 00 28.6	359.9445	-0.0468	G359.9444-0.0464	SiO359.944-00.047	SiO J=1-0 v=2;		-27.3	0.77	1.72	NRO	0.059	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		MIY01
19	17 45 39.8	-28 59 51.6	359.9525	-0.0402	G359.9540-0.0405	SiO359.953-00.040	SiO J=1-0 v=1;		71.5	0.58	1.27	NRO	0.051	NRO				MIY01
20	17 45 39.8	-28 59 51.6	359.9525	-0.0402	G359.9540-0.0405	SiO359.953-00.040	SiO J=1-0 v=2;		71.6	0.53	1.68	NRO	0.056	NRO				MIY01
21	17 45 41.7	-29 00 1.5	359.9538	-0.0475	G359.9550-0.0459	SiO359.954-00.048	SiO J=1-0 v=1;		52.1	~ 0.26	0.67	NRO	0.069	NRO				MIY01
22	17 45 41.7	-29 00 1.5	359.9538	-0.0475	G359.9550-0.0459	SiO359.954-00.048	SiO J=1-0 v=2;		52.7	~ 0.29	1.67	NRO	0.069	NRO				MIY01
23	17 45 32	-28 57 50.2	359.9664	0.0018	G359.9670+0.0022	SiO359.966+00.002	SiO J=1-0 v=1;		-7.4	1.03	2.35	NRO	0.054	NRO	+SiO	SFR_MIXED		MIY01
24	17 45 32	-28 57 50.2	359.9664	0.0018	G359.9670+0.0022	SiO359.966+00.002	SiO J=1-0 v=2;		-8.1	0.65	2.23	NRO	0.053	NRO	+SiO	SFR_MIXED		MIY01

Distribution of sources in all sky (l,b)

Distribution of sources in all sky using Aladin

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Distribution of sources in IRAS color-color diagram

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Original color diagram is taken form van der Veen & Habing (1987)

Type	Description
I	Oxygen-rich non-variable stars without circumstellar shells
II	Variable stars with "young" O-rich circumstellar shells
IIIa	Variable stars with more evolved O-rich circumstellar shells
IIIb	Variable stars with thick O-rich circumstellar shells
IV	Variable stars with very thick O-rich circumstellar shells
V	Planetary nebulae and non- variable stars with very cool circumstellar shells
VIa	Variable stars with relatively cold dust at large distances; a significant part of the stars is carbon-rich
VIb	Variable stars with relatively hot dust close to the star and relatively cold dust at large distances; Some of the objects have proven to be O-rich
VII	Variable stars with more evolved C-rich circumstellar shells
VIII	Different sort of objects

Distribution of the detection velocities versus galactic longitude from MIY01

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