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• Target type: Galaxy_center,Blind
  Transitions: CH3OH_6(II)
  

• Abstract

  We have used the Australia Telescope Compact Array to survey the Galactic Centre for the 22-GHz transition of water. The survey provides an unbiased search for water masers within a 0.5 deg2 region about the Centre, and the small synthesized beam directly yields positions to arcsecond accuracy. The detected sources were re-observed 4 months later and showed considerable changes in their spectra, with two sources found in the follow-up that were not seen in the original survey, yielding a total of 27 maser detections. Comparison with methanol and OH surveys shows that, at current sensitivity levels, water masers greatly outnumber the other species. 12 of our maser detections had previously been reported, discovered during searches towards interesting targets in the survey area. The majority of our sources are quite weak, consistent with excitation by young massive stars mostly near the Galactic Centre. Our spectra reveal high-velocity outflows at one-quarter of the water maser sites, a statistic similar to sites in the remainder of the Galaxy.

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Other name	Image	Descr.	Line	Vrange	Vpeak	Fpeak	Telescope	Vstep	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)			Obs type			H2O	(km/s)	(km/s)	(Jy)		(km/s)	(Jy)	(arcsec)	Yes/No		(kpc)
1	17 46 27.3	-29 22 0.5	359.7270	-0.3796	G359.725-0.392	359.727-0.380	Follow-up	Image		22 GHz;	-7;-3	-5	80	ATCA	2	0.100	10 x 7.5	+H2O -CH3OH II	SFR_MIXED		2007 May 26-27
	17 46 27.3	-29 22 0.5	359.7270	-0.3796	G359.725-0.392	359.727-0.380	Survey			22 GHz;	-7;-3	-5	15	ATCA	2	0.100	25	+H2O -CH3OH II	SFR_MIXED		2007 October 9
3	17 46 28.7	-29 20 29.5	359.7513	-0.3710	G359.751-0.371	359.751-0.371	Follow-up	Image	Descr	22 GHz;	-65;69	-15	6	ATCA	2	0.100	10 x 7.5	+H2O +OH	SFR		2007 May 26-27
	17 46 28.7	-29 20 29.5	359.7513	-0.3710	G359.751-0.371	359.751-0.371	Survey			22 GHz;	-65;69	-58	9.6	ATCA	2	0.100	25	+H2O +OH	SFR		2007 October 9
5	17 45 36.3	-29 05 50	359.8609	-0.0813	G359.8613-0.0808	359.861-0.081	Follow-up	Image	Descr	22 GHz;	3;16	13	4.5	ATCA	2	0.100	10 x 7.5	+H2O +CH3OH I	SFR_MIXED		2007 May 26-27
	17 45 36.3	-29 05 50	359.8609	-0.0813	G359.8613-0.0808	359.861-0.081	Survey			22 GHz;	3;16	12	4.3	ATCA	2	0.100	25	+H2O +CH3OH I	SFR_MIXED		2007 October 9
7	17 45 37.9	-29 05 45	359.8651	-0.0855	G359.8654-0.0863	359.865-0.085	Follow-up	Image	Descr	22 GHz;	-36;32	-19	1.65	ATCA	2	0.100	10 x 7.5	+H2O +CH3OH I +CH3OH II	SFR_MIXED		2007 May 26-27
8	17 46 40.5	-29 12 54.7	359.8816	-0.3420	G359.882-0.342	359.882-0.342	Follow-up	Image	Descr	22 GHz;	87;100	97	0.25	ATCA	2	0.100	10 x 7.5	+H2O	SFR		2007 May 26-27
	17 46 40.5	-29 12 54.7	359.8816	-0.3420	G359.882-0.342	359.882-0.342	Survey			22 GHz;	87;100	97	0.82	ATCA	2	0.100	25	+H2O	SFR		2007 October 9
10	17 45 37.5	-29 03 50.1	359.8916	-0.0676	G359.8928-0.0671	359.892-0.068	Follow-up	Image	Descr	22 GHz;	18;39	28	1.6	ATCA	2	0.100	10 x 7.5	+H2O +CH3OH I +CH3OH II	SFR_MIXED		2007 May 26-27
	17 45 37.5	-29 03 50.1	359.8916	-0.0676	G359.8928-0.0671	359.892-0.068	Survey			22 GHz;	18;39	27	0.89	ATCA	2	0.100	25	+H2O +CH3OH I +CH3OH II	SFR_MIXED		2007 October 9
12	17 46 1.9	-29 03 58.7	359.9358	-0.1446	G359.9360-0.1446	359.936-0.145	Follow-up	Image	Descr	22 GHz;	-59;24	-19	12.7	ATCA	2	0.100	10 x 7.5	+H2O +OH	SFR_MIXED		2007 May 26-27
	17 46 1.9	-29 03 58.7	359.9358	-0.1446	G359.9360-0.1446	359.936-0.145	Survey			22 GHz;	-59;24	-18	5.2	ATCA	2	0.100	25	+H2O +OH	SFR_MIXED		2007 October 9
14	17 45 56.1	-28 55 51.4	0.0404	-0.0562	G0.0401-0.0560	0.040-0.056	Survey	Image		22 GHz;	52;58	55	1.28	ATCA	2	0.100	25	+H2O +OH +SiO	SFR_MIXED		2007 October 9
15	17 46 34.5	-28 59 58.4	0.0546	-0.2114	G0.055-0.211	0.055-0.211	Follow-up	Image	Descr	22 GHz;	0;22	14	9.3	ATCA	2	0.100	10 x 7.5	+H2O	SFR		2007 May 26-27
	17 46 34.5	-28 59 58.4	0.0546	-0.2114	G0.055-0.211	0.055-0.211	Survey	Image		22 GHz;	0;22	13	2.2	ATCA	2	0.100	25	+H2O	SFR		2007 October 9
17	17 46 29.9	-28 56 21.8	0.0973	-0.1659	G0.0977-0.1654	0.097-0.166	Follow-up	Image		22 GHz;	-6;3	0.001	1.2	ATCA	2	0.100	10 x 7.5	+H2O +OH	SFR		2007 May 26-27
	17 46 29.9	-28 56 21.8	0.0973	-0.1659	G0.0977-0.1654	0.097-0.166	Survey			22 GHz;	-6;3	0.001	0.95	ATCA	2	0.100	25	+H2O +OH	SFR		2007 October 9
19	17 46 15.2	-28 53 41	0.1076	-0.0969	G0.1076-0.0969	0.108-0.097	Follow-up	Image	Descr	22 GHz;	-34;-27	-31	0.25	ATCA	2	0.100	10 x 7.5	+H2O +SiO	SFR_MIXED		2007 May 26-27
	17 46 15.2	-28 53 41	0.1076	-0.0969	G0.1076-0.0969	0.108-0.097	Survey			22 GHz;	-34;-27	-31	0.89	ATCA	2	0.100	25	+H2O +SiO	SFR_MIXED		2007 October 9
21	17 46 10.7	-28 51 51.2	0.1250	-0.0668	G0.1250-0.0668	0.125-0.067	Follow-up	Image	Descr	22 GHz;	-27;-22	-25	2.3	ATCA	2	0.100	10 x 7.5	+H2O	SFR_MIXED		2007 May 26-27
	17 46 10.7	-28 51 51.2	0.1250	-0.0668	G0.1250-0.0668	0.125-0.067	Survey			22 GHz;	-27;-22	-26	0.74	ATCA	2	0.100	25	+H2O	SFR_MIXED		2007 October 9
23	17 46 27.9	-28 50 22.7	0.1787	-0.1079	G0.1788-0.1079	0.179-0.108	Follow-up	Image	Descr	22 GHz;	63;92	81	1.5	ATCA	2	0.100	10 x 7.5	+H2O +SiO	SFR_MIXED		2007 May 26-27
	17 46 27.9	-28 50 22.7	0.1787	-0.1079	G0.1788-0.1079	0.179-0.108	Survey			22 GHz;	63;92	81	1.7	ATCA	2	0.100	25	+H2O +SiO	SFR_MIXED		2007 October 9
25	17 46 7.3	-28 45 33.1	0.2083	-0.0016	G0.2118-0.0009	0.209-0.002	Follow-up	Image	Descr	22 GHz;	21;43	42	1.1	ATCA	2	0.100	10 x 7.5	+H2O +CH3OH I +CH3OH II	SFR_MIXED		2007 May 26-27
	17 46 7.3	-28 45 33.1	0.2083	-0.0016	G0.2118-0.0009	0.209-0.002	Survey			22 GHz;	21;43	30	0.9	ATCA	2	0.100	25	+H2O +CH3OH I +CH3OH II	SFR_MIXED		2007 October 9
27	17 46 7.6	-28 45 21.6	0.2116	-0.0009	G0.2118-0.0009	0.212-0.002	Follow-up	Image	Descr	22 GHz;	44;60	45	0.45	ATCA	2	0.100	10 x 7.5	+H2O +CH3OH I +CH3OH II	SFR_MIXED		2007 May 26-27
	17 46 7.6	-28 45 21.6	0.2116	-0.0009	G0.2118-0.0009	0.212-0.002	Survey			22 GHz;	44;60	45	0.16	ATCA	2	0.100	25	+H2O +CH3OH I +CH3OH II	SFR_MIXED		2007 October 9
29	17 46 10.1	-28 45 38.6	0.2123	-0.0111	G0.2123-0.0111	0.212-0.011	Follow-up	Image	Descr	22 GHz;	66;100	98	0.2	ATCA	2	0.100	10 x 7.5	+H2O	SFR_MIXED		2007 May 26-27
	17 46 10.1	-28 45 38.6	0.2123	-0.0111	G0.2123-0.0111	0.212-0.011	Survey	Image		22 GHz;	66;100	70	1	ATCA	2	0.100	25	+H2O	SFR_MIXED		2007 October 9
31	17 46 13	-28 45 50.9	0.2150	-0.0221	G0.2150-0.0221	0.216-0.023	Follow-up	Image	Descr	22 GHz;	-21;17	-13	1.6	ATCA	2	0.100	10 x 7.5	+H2O	SFR_MIXED		2007 May 26-27
	17 46 13	-28 45 50.9	0.2150	-0.0221	G0.2150-0.0221	0.216-0.023	Survey			22 GHz;	-21;17	-13	2.5	ATCA	2	0.100	25	+H2O	SFR_MIXED		2007 October 9
33	17 46 44.8	-28 49 50.9	0.2182	-0.1557	G0.2182-0.1557	0.218-0.156	Follow-up	Image	Descr	22 GHz;	42;81	45	4	ATCA	2	0.100	10 x 7.5	+H2O	SFR		2007 May 26-27
	17 46 44.8	-28 49 50.9	0.2182	-0.1557	G0.2182-0.1557	0.218-0.156	Survey			22 GHz;	42;81	46	7.5	ATCA	2	0.100	25	+H2O	SFR		2007 October 9
35	17 47 0.6	-28 45 45.4	0.3065	-0.1698	G0.3065-0.1698	0.306-0.170	Follow-up	Image	Descr	22 GHz;	1;13	11	15	ATCA	2	0.100	10 x 7.5	+H2O	SFR_MIXED		2007 May 26-27
	17 47 0.6	-28 45 45.4	0.3065	-0.1698	G0.3065-0.1698	0.306-0.170	Survey	Image		22 GHz;	1;13	7	95	ATCA	2	0.100	25	+H2O	SFR_MIXED		2007 October 9
37	17 47 2.2	-28 45 55.5	0.3070	-0.1761	G0.3070-0.1761	0.308-0.177	Follow-up	Image	Descr	22 GHz;	-30;-24	-28	3.6	ATCA	2	0.100	10 x 7.5	+H2O +OH	SFR_MIXED		2007 May 26-27
	17 47 2.2	-28 45 55.5	0.3070	-0.1761	G0.3070-0.1761	0.308-0.177	Survey			22 GHz;	-30;-24	-28	1.26	ATCA	2	0.100	25	+H2O +OH	SFR_MIXED		2007 October 9
39	17 47 9.2	-28 46 17	0.3152	-0.2012	G0.315-0.201	0.316-0.201	Follow-up	Image	Descr	22 GHz;	-14;24	21	2.9	ATCA	2	0.100	10 x 7.5	+H2O -CH3OH I +CH3OH II +OH	SFR		2007 May 26-27
	17 47 9.2	-28 46 17	0.3152	-0.2012	G0.315-0.201	0.316-0.201	Survey			22 GHz;	-14;24	22	2.1	ATCA	2	0.100	25	+H2O -CH3OH I +CH3OH II +OH	SFR		2007 October 9
41	17 46 1.7	-28 35 53.6	0.3351	0.0996	G0.3351+0.0996	0.335+0.100	Follow-up	Image	Descr	22 GHz;	-15;7	-14	4.5	ATCA	2	0.100	10 x 7.5	+H2O	SFR_MIXED		2007 May 26-27
	17 46 1.7	-28 35 53.6	0.3351	0.0996	G0.3351+0.0996	0.335+0.100	Survey			22 GHz;	-15;7	3	1	ATCA	2	0.100	25	+H2O	SFR_MIXED		2007 October 9
43	17 46 36.8	-28 38 3.7	0.3710	-0.0289	G0.3710-0.0289	0.371-0.029	Follow-up	Image	Descr	22 GHz;	-1;12	4	0.35	ATCA	2	0.100	10 x 7.5	+H2O	SFR		2007 May 26-27
	17 46 36.8	-28 38 3.7	0.3710	-0.0289	G0.3710-0.0289	0.371-0.029	Survey			22 GHz;	-1;12	3	1.9	ATCA	2	0.100	25	+H2O	SFR		2007 October 9
45	17 47 09	-28 42 6.5	0.3744	-0.1645	G0.3744-0.1645	0.374-0.165	Follow-up	Image	Descr	22 GHz;	-22;-3	-6	3.2	ATCA	2	0.100	10 x 7.5	+H2O	SFR		2007 May 26-27
	17 47 09	-28 42 6.5	0.3744	-0.1645	G0.3744-0.1645	0.374-0.165	Survey			22 GHz;	-22;-3	-10	2.2	ATCA	2	0.100	25	+H2O	SFR		2007 October 9
47	17 46 21.4	-28 35 40.2	0.3757	0.0401	G0.3758+0.0401	0.376+0.040	Follow-up	Image	Descr	22 GHz;	7;81	39	10.8	ATCA	2	0.100	10 x 7.5	+H2O +OH	SFR		2007 May 26-27
	17 46 21.4	-28 35 40.2	0.3757	0.0401	G0.3758+0.0401	0.376+0.040	Survey			22 GHz;	7;81	41	21.4	ATCA	2	0.100	25	+H2O +OH	SFR		2007 October 9
49	17 46 21.8	-28 35 25.4	0.3800	0.0408	G0.3800+0.0408	0.380+0.041	Follow-up	Image	Descr	22 GHz;	22;50	40	3.3	ATCA	2	0.100	10 x 7.5	+H2O	SFR		2007 May 26-27
	17 46 21.8	-28 35 25.4	0.3800	0.0408	G0.3800+0.0408	0.380+0.041	Survey			22 GHz;	22;50	25	3.6	ATCA	2	0.100	25	+H2O	SFR		2007 October 9
51	17 46 18.5	-28 34 49.1	0.3825	0.0562	G0.3825+0.0562	0.382+0.056	Follow-up	Image	Descr	22 GHz;	10;14	12	2.8	ATCA	2	0.100	10 x 7.5	+H2O	SFR		2007 May 26-27

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Other name	Descr.	Line	Vrange	Fpeak	Telescope	Vstep	RMS	Beam	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)			Obs type		H2O	(km/s)	(Jy)		(km/s)	(Jy)	(arcsec)	Yes/No
1	17 45 37.9	-29 05 45	359.8651	-0.0855	G359.8654-0.0863	359.865-0.085	Survey		22 GHz;	-36;32	<0.3	ATCA	2	0.100	25	+H2O +CH3OH I +CH3OH II	SFR_MIXED	2007 October 9
2	17 45 56.1	-28 55 51.4	0.0404	-0.0562	G0.0401-0.0560	0.040-0.056	Follow-up	Descr	22 GHz;	52;58		ATCA	2	0.100	10 x 7.5	+H2O +OH +SiO	SFR_MIXED	2007 May 26-27
3	17 46 18.5	-28 34 49.1	0.3825	0.0562	G0.3825+0.0562	0.382+0.056	Survey		22 GHz;	10;14	<0.4	ATCA	2	0.100	25	+H2O	SFR	2007 October 9

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