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DEG02 - Observations of SiO Maser Sources within a Few Parsec from the Galactic Center

Short title: Deguchi et al. (2002)
Authors: Deguchi, Shuji Fujii, Takahiro Miyoshi, Makoto Nakashima, Jun-Ichi
Journal: Publications of the Astronomical Society of Japan, Vol.54, No.1, pp.61-71
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Abstract
Mapping and monitoring observations of SiO maser sources near the Galactic center were made with the Nobeyama 45-m telescope at 43GHz. Rectangular mapping an area of approximately 200'' � 100'' in a 30'' grid, and triangular mapping in a 20'' grid toward the Galactic center, resulted in 15 detections of SiO sources the positions of the sources were obtained with errors of 5-10'', except for a few weak sources. Three-year monitoring observations found that the component at V_lsr = -27km s^-1 of IRS 10 EE flared to about 1.5Jy during 2000 March-May, which was a factor of more than 5 brighter than its normal intensity. Using the radial velocities and positions of the SiO sources, we identified 5 which are counterparts of previously observed OH 1612MHz sources. The other 10 SiO sources have no OH counterparts, but two were previously detected with VLA, and four are located close to the positions of large-amplitude variables observed at near-in frared wavelengths. A least-squares fit to a plot of velocities versus Galactic longitudes gives a rather high speed for the rotation of the star cluster around the Galactic center. The observed radial-velocity dispersion is roughly consistent with a value obtained before. It was found that all of the SiO sources with OH 1612MHz counterparts have periods of light variation longer than 450days, while SiO sources without OH masers often have periods shorter than 450days. This fact suggests that lower-mass AGB stars are more often detected in SiO masers than in the OH 1612MHz line. eprintid: arXiv:astro-ph/0201077

Abstract

Mapping and monitoring observations of SiO maser sources near the Galactic center were made with the Nobeyama 45-m telescope at 43GHz. Rectangular mapping an area of approximately 200'' � 100'' in a 30'' grid, and triangular mapping in a 20'' grid toward the Galactic center, resulted in 15 detections of SiO sources the positions of the sources were obtained with errors of 5-10'', except for a few weak sources. Three-year monitoring observations found that the component at V_lsr = -27km s^-1 of IRS 10 EE flared to about 1.5Jy during 2000 March-May, which was a factor of more than 5 brighter than its normal intensity. Using the radial velocities and positions of the SiO sources, we identified 5 which are counterparts of previously observed OH 1612MHz sources. The other 10 SiO sources have no OH counterparts, but two were previously detected with VLA, and four are located close to the positions of large-amplitude variables observed at near-in frared wavelengths. A least-squares fit to a plot of velocities versus Galactic longitudes gives a rather high speed for the rotation of the star cluster around the Galactic center. The observed radial-velocity dispersion is roughly consistent with a value obtained before. It was found that all of the SiO sources with OH 1612MHz counterparts have periods of light variation longer than 450days, while SiO sources without OH masers often have periods shorter than 450days. This fact suggests that lower-mass AGB stars are more often detected in SiO masers than in the OH 1612MHz line. eprintid: arXiv:astro-ph/0201077

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Detection table from Deguchi et al. (2002)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	T_a	∫T_a dv	Telescope	RMS	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			SiO	(km/s)	(K)	(K*km/s)		(Jy)		Yes/No		(kpc)
1	17 45 34.7	-29 01 48	359.9151	-0.0410	G359.9140-0.0420	SiO359.915-0.041	43.1 GHz;	-26	0.096	0.368	NRO	0.019	NRO	+SiO	SFR_MIXED		DEG02
2	17 45 34.7	-29 01 48	359.9151	-0.0410	G359.9140-0.0420	SiO359.915-0.041	42.8 GHz;	-27.4	0.084	0.496	NRO	0.021	NRO	+SiO	SFR_MIXED		DEG02
3	17 45 38.6	-29 02 2.7	359.9190	-0.0553	G359.9184-0.0551	SiO359.919-0.055	43.1 GHz;	-308	0.668	2.764	NRO	0.018	NRO	+OH +SiO	SFR_MIXED		DEG02
4	17 45 38.6	-29 02 2.7	359.9190	-0.0553	G359.9184-0.0551	SiO359.919-0.055	42.8 GHz;	-308.3	0.403	2.173	NRO	0.021	NRO	+OH +SiO	SFR_MIXED		DEG02
5	17 45 37	-29 01 40.8	359.9212	-0.0471	G359.9212-0.0471	SiO359.921-0.047	43.1 GHz;	-110.2	0.172	0.7	NRO	0.019	NRO				DEG02
6	17 45 37	-29 01 40.8	359.9212	-0.0471	G359.9212-0.0471	SiO359.921-0.047	42.8 GHz;	-110.1	0.144	0.775	NRO	0.023	NRO				DEG02
7	17 45 37.7	-29 01 9.8	359.9300	-0.0451	G359.9320-0.0447	SiO359.930-0.045	43.1 GHz;	6.3	0.109	0.436	NRO	0.018	NRO	+SiO	SFR_MIXED		DEG02
8	17 45 37.7	-29 01 9.8	359.9300	-0.0451	G359.9320-0.0447	SiO359.930-0.045	42.8 GHz;	7.4	0.087	0.296	NRO	0.014	NRO	+SiO	SFR_MIXED		DEG02
9	17 45 39.7	-29 00 26.6	359.9440	-0.0450	G359.9444-0.0465	SiO359.944-0.045	43.1 GHz;	-335.8	0.031	0.123	NRO	0.009	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
10	17 45 39.7	-29 00 26.6	359.9440	-0.0450	G359.9444-0.0465	SiO359.944-0.045	42.8 GHz;	-335.7	0.044	0.314	NRO	0.014	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
11	17 45 39.9	-29 00 23.6	359.9451	-0.0452	G359.9444-0.0465	SiO359.945-0.045	43.1 GHz;	-60.8	0.102	0.206	NRO	0.012	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
12	17 45 39.9	-29 00 23.6	359.9451	-0.0452	G359.9444-0.0465	SiO359.945-0.045	42.8 GHz;	-62	0.109	0.243	NRO	0.014	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
13	17 45 40.3	-29 00 27.6	359.9449	-0.0470	G359.9444-0.0465	SiO359.945-0.047	43.1 GHz;	-27.8	0.349	1.228	NRO	0.008	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
14	17 45 40.3	-29 00 27.6	359.9449	-0.0470	G359.9444-0.0465	SiO359.945-0.047	42.8 GHz;	-27.4	0.583	1.732	NRO	0.010	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
15	17 45 40	-29 00 20.6	359.9460	-0.0450	G359.9444-0.0465	SiO359.946-0.045	43.1 GHz;	-12.5	0.051	0.157	NRO	0.010	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
16	17 45 40	-29 00 20.6	359.9460	-0.0450	G359.9444-0.0465	SiO359.946-0.045	42.8 GHz;	-13.7	0.044	0.288	NRO	0.007	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
17	17 45 40.2	-29 00 22.6	359.9459	-0.0459	G359.9444-0.0465	SiO359.946-0.046	43.1 GHz;	85.2	0.073	0.265	NRO	0.008	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
18	17 45 40.2	-29 00 22.6	359.9459	-0.0459	G359.9444-0.0465	SiO359.946-0.046	42.8 GHz;	84.8	0.046	0.103	NRO	0.010	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
19	17 45 40.5	-29 00 24.6	359.9460	-0.0472	G359.9444-0.0465	SiO359.946-0.047	42.8 GHz;	-117.3	0.036	0.16	NRO	0.010	NRO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		DEG02
20	17 45 39.7	-28 59 52.6	359.9520	-0.0400	G359.9540-0.0406	SiO359.952-0.040	43.1 GHz;	71.7	0.302	1.027	NRO	0.022	NRO	+OH	SFR_MIXED		DEG02
21	17 45 39.7	-28 59 52.6	359.9520	-0.0400	G359.9540-0.0406	SiO359.952-0.040	42.8 GHz;	71.3	0.249	1.151	NRO	0.028	NRO	+OH	SFR_MIXED		DEG02
22	17 45 38	-28 59 34.7	359.9530	-0.0321	G359.9548-0.0303	SiO359.953-0.032	43.1 GHz;	37.7	0.092	0.161	NRO	0.014	NRO				DEG02
23	17 45 38	-28 59 34.7	359.9530	-0.0321	G359.9548-0.0303	SiO359.953-0.032	42.8 GHz;	37.7	0.078	0.26	NRO	0.014	NRO				DEG02
24	17 45 43	-28 59 58.4	359.9570	-0.0511	G359.9568-0.0500	SiO359.957-0.051	43.1 GHz;	51.1	0.202	0.951	NRO	0.022	NRO	+H₂O +OH +SiO	SFR_MIXED		DEG02
25	17 45 43	-28 59 58.4	359.9570	-0.0511	G359.9568-0.0500	SiO359.957-0.051	42.8 GHz;	54.4	0.16	0.852	NRO	0.025	NRO	+H₂O +OH +SiO	SFR_MIXED		DEG02
26	17 45 43	-28 59 3.4	359.9700	-0.0431	G359.9700-0.0430	SiO359.970-0.043	43.1 GHz;	23.3	0.311	1.037	NRO	0.021	NRO	+SiO	SFR_MIXED		DEG02
27	17 45 43	-28 59 3.4	359.9700	-0.0431	G359.9700-0.0430	SiO359.970-0.043	42.8 GHz;	23.2	0.416	1.69	NRO	0.026	NRO	+SiO	SFR_MIXED		DEG02
28	17 45 44.6	-28 59 3.3	359.9730	-0.0481	G359.9703-0.0482	SiO359.973-0.048	43.1 GHz;	86.9	0.161	0.686	NRO	0.021	NRO	+H₂O +OH +SiO	SFR_MIXED		DEG02
29	17 45 44.6	-28 59 3.3	359.9730	-0.0481	G359.9703-0.0482	SiO359.973-0.048	42.8 GHz;	86.5	0.152	0.915	NRO	0.026	NRO	+H₂O +OH +SiO	SFR_MIXED		DEG02

Non-detection table from Deguchi et al. (2002)