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• Abstract

  We present the Australia Telescope Compact Array observations of the SiO masers in the Galactic center (GC) in transitions of v = 1, J = 2-1 at 86 GHz and v = 1, J = 1-0 at 43 GHz. Two 86 GHz SiO masers were detected within the central parsec, and they are associated with IRS 10EE and IRS 15NE, respectively. We detected eighteen 43 GHz SiO masers within a projected separation of lsim2 pc from Sagittarius A*, among which seven masers are newly discovered from our observations. This raises the total number of 43 GHz SiO masers within the central 4 pc of the GC region to 22. Simultaneous observations at 86 and 43 GHz showed that the intensity of 43 GHz SiO maser is ~3 times higher than that of 86 GHz maser in IRS 10EE (an OH/IR star), while the integrated flux of the SiO maser emission at 43 GHz is comparable with that at 86 GHz in IRS 15NE (an ordinary Mira variable). These results are consistent with previous observations of massive late-type stars in the Galaxy in which the 86 GHz SiO maser is in general weaker than the 43 GHz SiO maser in OH/IR stars, while the two transitions are comparably strong in Mira stars.

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Vrange	Vpeak	Fpeak	∫F dv	RMS	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			(km/s)	(km/s)	(Jy)	(Jy*km/s)	(Jy)		Yes/No		(kpc)
1	17 45 38.3	-29 01 1.9	359.9329	-0.0456	G359.9320-0.0447	*SiO-16	0.00	7.7	0.055	5.666	0.005	ENG_SIO	+SiO	SFR_MIXED		LI10
	17 45 38.3	-29 01 1.9	359.9329	-0.0456	G359.9320-0.0447	*SiO-16	0.00	9.1	0.109	40.678	0.005	ENG_SIO	+SiO	SFR_MIXED		LI10
3	17 45 38.8	-28 59 44.6	359.9521	-0.0359	G359.9518-0.0355	SiO-12	0.00	80	0.043	1.676	0.005	ENG_SIO	-H2O -CH3OH I +SiO	SFR_MIXED		LI10
4	17 45 38.8	-28 59 44.6	359.9521	-0.0359	G359.9518-0.0355	*SiO-12	0.00	80	0.033	1.138	0.005	ENG_SIO	-H2O -CH3OH I +SiO	SFR_MIXED		LI10
5	17 45 38.8	-29 00 53.9	359.9357	-0.0460	G359.9357-0.0460	SiO-18	0.00	-77.6	0.04	1.043	0.005	ENG_SIO				LI10
6	17 45 38.8	-29 00 53.9	359.9357	-0.0460	G359.9357-0.0460	*SiO-18	0.00	-78	0.023	0.643	0.005	ENG_SIO				LI10
7	17 45 39.1	-29 00 7.2	359.9474	-0.0402	G359.9474-0.0402	SiO-20	0.00	-20.3	0.092	3.239	0.005	ENG_SIO	+SiO	SFR_MIXED		LI10
8	17 45 39.2	-29 00 38.5	359.9402	-0.0451	G359.9444-0.0464	SiO-15	0.00	-35.5	0.05	1.752	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
9	17 45 39.2	-29 00 38.5	359.9402	-0.0451	G359.9444-0.0464	*SiO-15	0.00	-36	0.019	0.663	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
10	17 45 39.8	-29 00 34.4	359.9423	-0.0464	G359.9444-0.0464	IRS 12N	0.00	-63.2	0.284	73.732	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
11	17 45 39.8	-29 00 34.4	359.9423	-0.0464	G359.9444-0.0464	*IRS 12N	0.00	-62.6	0.118	7.704	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
12	17 45 40.1	-29 00 36.1	359.9425	-0.0475	G359.9444-0.0464	IRS 14NE	0.00	-11.7	0.051	2.313	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
13	17 45 40.5	-29 00 23.3	359.9463	-0.0470	G359.9444-0.0464	*IRS 10EE	0.00	-26.3	0.573	33.917	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
	17 45 40.5	-29 00 23.3	359.9463	-0.0470	G359.9444-0.0464	*IRS 10EE	0.00	-26.6	0.473	28.512	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
15	17 45 40.1	-29 00 16.2	359.9472	-0.0447	G359.9444-0.0464	IRS 15NE	0.00	-11.5	0.081	4.294	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
16	17 45 40.1	-29 00 16.2	359.9472	-0.0447	G359.9444-0.0464	*IRS 15NE	0.00	-13	0.046	3.879	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
17	17 45 40.1	-28 59 47.4	359.9541	-0.0406	G359.9540-0.0405	*SiO-11	0.00	71.1	0.24	14.338	0.005	ENG_SIO				LI10
	17 45 40.1	-28 59 47.4	359.9541	-0.0406	G359.9540-0.0405	*SiO-11	0.00	71.5	0.501	25.417	0.005	ENG_SIO				LI10
19	17 45 40.6	-29 00 55.3	359.9388	-0.0517	G359.9390-0.0518	SiO-17	0.00	54.1	0.596	27.143	0.005	ENG_SIO	+CH3OH I +OH +SiO	SFR_MIXED		LI10
20	17 45 40.6	-29 00 55.3	359.9388	-0.0517	G359.9390-0.0518	*SiO-17	0.00	54	0.112	4.043	0.005	ENG_SIO	+CH3OH I +OH +SiO	SFR_MIXED		LI10
21	17 45 40.7	-29 00 33.5	359.9443	-0.0491	G359.9444-0.0464	IRS 28	0.00	-54.1	0.13	6.599	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
22	17 45 40.7	-29 00 33.5	359.9443	-0.0491	G359.9444-0.0464	*IRS 28	0.00	-53.7	0.085	7.028	0.005	ENG_SIO	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		LI10
23	17 45 41.1	-29 00 45.3	359.9421	-0.0518	G359.9390-0.0518	IRS 19NW	0.00	84.1	0.062	4	0.005	ENG_SIO	+CH3OH I +OH +SiO	SFR_MIXED		LI10
24	17 45 41.1	-29 00 45.3	359.9421	-0.0518	G359.9390-0.0518	*IRS 19NW	0.00	85.9	0.057	2.998	0.005	ENG_SIO	+CH3OH I +OH +SiO	SFR_MIXED		LI10
25	17 45 41.1	-29 00 49.5	359.9412	-0.0526	G359.9390-0.0518	SiO-19	0.00	-29.4	0.037	1.175	0.005	ENG_SIO	+CH3OH I +OH +SiO	SFR_MIXED		LI10
26	17 45 41.6	-29 00 7.8	359.9521	-0.0482	G359.9550-0.0459	SiO-23	0.00	80	0.027	0.946	0.005	ENG_SIO				LI10
27	17 45 42.4	-28 59 56.4	359.9562	-0.0488	G359.9568-0.0500	SiO-6	0.00	52.9	0.112	34.91	0.005	ENG_SIO	+H2O +OH +SiO	SFR_MIXED		LI10
28	17 45 42.4	-28 59 56.4	359.9562	-0.0488	G359.9568-0.0500	*SiO-6	0.00	52.5	0.056	4.249	0.005	ENG_SIO	+H2O +OH +SiO	SFR_MIXED		LI10
29	17 45 42.8	-29 00 49.9	359.9442	-0.0578	G359.9442-0.0578	SiO-21	0.00	13.8	0.05	1.971	0.005	ENG_SIO				LI10
30	17 45 42.8	-29 00 12.4	359.9532	-0.0524	G359.9536-0.0535	*SiO-22	0.00	33.4	0.109	4.857	0.005	ENG_SIO	+SiO	SFR_MIXED		LI10
	17 45 42.8	-29 00 12.4	359.9532	-0.0524	G359.9536-0.0535	*SiO-22	0.00	33.6	0.266	15.765	0.005	ENG_SIO	+SiO	SFR_MIXED		LI10

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