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IMA02B - 3-D Kinematics of Water Masers in the W 51A Region

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Short title: Imai et al. (2002B)
Authors: Imai, HiroshiWatanabe, TeruhikoOmodaka, ToshihiroNishio, MasanoriKameya, OsamuMiyaji, TakeshiNakajima, Junichi
Journal: Publications of the Astronomical Society of Japan, Vol.54, No.5, pp.741-755
Bibcode:

Target type: High_mass_SFR
Transitions: H2O_22

Abstract
We report on proper-motion measurements of water masers in the massive-star forming region W51A and analyses of the 3-D kinematics of the masers in three maser clusters of W51A (W51 North, Main, and South). In W51 North, we found a clear expanding flow having an expansion velocity of ~ 70 km s^-1, which indicates deceleration. The originating point of the flow coincides within 0.1'' with a silicon-monoxide maser source near the H II region W51d. In W51 Main, no systematic motion was found over the whole velocity range (-58 km s^-1 <= V_LSR < 158 km s^-1), although a stream motion was previously reported in a limited range of the Doppler velocity (54 km s^-1 <= V_LSR < 68 km s^-1). Multiple driving sources of outflows are thought to explain the kinematics of W51 Main. In W51 South, an expansion motion like a bipolar flow was marginally visible. Analyses based on diagonalization of the variance-covariance matrix of maser velocity vectors demonstrate that the maser kinematics in W51 North and Main are significantly tri-axially asymmetric. We estimated the distance to W51 North to be 6.1 +/- 1.3 kpc based on a model-fitting method adopting a radially expanding flow.

Abstract

We report on proper-motion measurements of water masers in the massive-star forming region W51A and analyses of the 3-D kinematics of the masers in three maser clusters of W51A (W51 North, Main, and South). In W51 North, we found a clear expanding flow having an expansion velocity of ~ 70 km s^-1, which indicates deceleration. The originating point of the flow coincides within 0.1'' with a silicon-monoxide maser source near the H II region W51d. In W51 Main, no systematic motion was found over the whole velocity range (-58 km s^-1 <= V_LSR < 158 km s^-1), although a stream motion was previously reported in a limited range of the Doppler velocity (54 km s^-1 <= V_LSR < 68 km s^-1). Multiple driving sources of outflows are thought to explain the kinematics of W51 Main. In W51 South, an expansion motion like a bipolar flow was marginally visible. Analyses based on diagonalization of the variance-covariance matrix of maser velocity vectors demonstrate that the maser kinematics in W51 North and Main are significantly tri-axially asymmetric. We estimated the distance to W51 North to be 6.1 +/- 1.3 kpc based on a model-fitting method adopting a radially expanding flow.

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_range	V_peak	F_peak	Telescope	V_step	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(km/s)	(Jy/beam)		(km/s)	(Jy/beam)	(arcsec)	Yes/No		(kpc)
1	+19 23 40	+14 31 6.2			49.490057	-0.369429	G49.489-0.387		W 51N			22 GHz;	-58;158	-60.28 .. 69.41	3.01 .. 7974.74	J-Net	0.21	22.000	0.0088 x 0.003	+H₂O +OH	SFR		1999 Feb 21 - Oct 21
	+19 23 40.0054	+14 31 6.17799	79.47 mas	-22.41 mas	49.490062	-0.369451		1	W 51N					-60.28	46.68
	+19 23 40.006	+14 31 6.24792	88.94 mas	47.52 mas	49.490080	-0.369444		2	W 51N					-54.49	37.5
	+19 23 40.006	+14 31 6.2476	89.08 mas	47.2 mas	49.490080	-0.369444		3	W 51N					-52.22	892.23
	+19 23 40.0001	+14 31 6.2004	0 mas	0 mas	49.490058	-0.369429		4	W 51N					-47.71	144.14
	+19 23 40.0049	+14 31 6.1995	72.09 mas	-0.9 mas	49.490066	-0.369447		5	W 51N					-46.45	12.98
	+19 23 40.0049	+14 31 6.19917	72.39 mas	-1.23 mas	49.490066	-0.369447		6	W 51N					-44.81	100.2
	+19 23 40.008	+14 31 6.23167	119.36 mas	31.27 mas	49.490080	-0.369454		7	W 51N					-39.86	10.32
	+19 23 40.0087	+14 31 6.20832	129.2 mas	7.92 mas	49.490076	-0.369459		8	W 51N					-34.65	45.38
	+19 23 40.0084	+14 31 6.23154	125.34 mas	31.14 mas	49.490081	-0.369455		9	W 51N					-34.24	5
	+19 23 40.0084	+14 31 6.23882	124.67 mas	38.42 mas	49.490083	-0.369454		10	W 51N					-32.96	190.68
	+19 23 40.0085	+14 31 6.23897	125.62 mas	38.57 mas	49.490083	-0.369454		11	W 51N					-31.83	30.6
	+19 23 40.0084	+14 31 6.23064	125.45 mas	30.24 mas	49.490081	-0.369455		12	W 51N					-31.41	14.9
	+19 23 40.0087	+14 31 6.2087	129.33 mas	8.3 mas	49.490076	-0.369459		13	W 51N					-31.31	13.37
	+19 23 40.0085	+14 31 6.2387	125.69 mas	38.3 mas	49.490083	-0.369454		14	W 51N					-30.37	17.69
	+19 23 40.0001	+14 31 6.19332	0.63 mas	-7.08 mas	49.490056	-0.369431		15	W 51N					-28.94	89.45
	+19 23 40.0054	+14 31 6.22004	79.72 mas	19.64 mas	49.490072	-0.369446		16	W 51N					-28.66	9.01
	+19 23 40.0056	+14 31 6.17496	82.41 mas	-25.44 mas	49.490062	-0.369452		17	W 51N					-26.16	4.03
	+19 23 40.0088	+14 31 6.20668	130.33 mas	6.28 mas	49.490076	-0.369460		18	W 51N					-25.81	25.1
	+19 23 40.003	+14 31 6.18301	43.26 mas	-17.39 mas	49.490059	-0.369442		19	W 51N					-25.33	44.58
	+19 23 40.0085	+14 31 6.2044	126.16 mas	4 mas	49.490075	-0.369459		20	W 51N					-24.58	61.4
	+19 23 40.0045	+14 31 6.2792	66.7 mas	78.8 mas	49.490085	-0.369435		21	W 51N					-24.21	247.27
	+19 23 40.0045	+14 31 6.27929	66.88 mas	78.89 mas	49.490085	-0.369435		22	W 51N					-23.14	151.73
	+19 23 40.0074	+14 31 6.175	109.27 mas	-25.4 mas	49.490065	-0.369459		23	W 51N					-20.22	188.58
	+19 23 40.0085	+14 31 6.2011	125.98 mas	0.7 mas	49.490074	-0.369459		24	W 51N					-20.14	91.5
	+19 23 39.9988	+14 31 6.14661	-19.76 mas	-53.79 mas	49.490042	-0.369432		25	W 51N					-20.1	155.72
	+19 23 40.0074	+14 31 6.17485	109.32 mas	-25.55 mas	49.490065	-0.369459		26	W 51N					-16.36	649.1
	+19 23 40.0015	+14 31 6.13362	21.99 mas	-66.78 mas	49.490044	-0.369443		27	W 51N					-15.71	96.7
	+19 23 40.0086	+14 31 6.20017	128.27 mas	-0.23 mas	49.490074	-0.369460		28	W 51N					-14.45	139.1
	+19 23 40.0266	+14 31 5.57182	398.09 mas	-628.58 mas	49.489954	-0.369606		29	W 51N					-14.43	457.59
	+19 23 40.0074	+14 31 6.17455	109.33 mas	-25.85 mas	49.490065	-0.369459		30	W 51N					-14.34	427.39
	+19 23 40.0071	+14 31 6.17285	104.82 mas	-27.55 mas	49.490064	-0.369458		31	W 51N					-12.8	339
	+19 23 40.0266	+14 31 5.57232	397.93 mas	-628.08 mas	49.489954	-0.369606		32	W 51N					-12.46	9.9
	+19 23 39.9982	+14 31 6.09648	-28.11 mas	-103.92 mas	49.490029	-0.369436		33	W 51N					-11.59	24.9
	+19 23 40.0075	+14 31 6.17584	111.24 mas	-24.56 mas	49.490066	-0.369459		34	W 51N					-9.19	40.45
	+19 23 40.0074	+14 31 6.17487	110.37 mas	-25.53 mas	49.490065	-0.369459		35	W 51N					-8.04	27.12
	+19 23 40.0074	+14 31 6.17474	109.97 mas	-25.66 mas	49.490065	-0.369459		36	W 51N					-6.85	240.26
	+19 23 40.004	+14 31 6.1226	58.31 mas	-77.8 mas	49.490046	-0.369453		37	W 51N					-5.76	193.45
	+19 23 40.0257	+14 31 5.55201	384.15 mas	-648.39 mas	49.489948	-0.369606		38	W 51N					-4.68	190.35
	+19 23 39.9703	+14 31 6.42473	-446.62 mas	224.33 mas	49.490056	-0.369294		39	W 51N					-3.99	1100.97
	+19 23 39.97	+14 31 6.45179	-451.21 mas	251.39 mas	49.490062	-0.369290		40	W 51N					-2.81	1437.13
	+19 23 39.9728	+14 31 6.56924	-409 mas	368.84 mas	49.490096	-0.369284		41	W 51N					-1.34	52.66
	+19 23 40.0059	+14 31 6.16938	86.73 mas	-31.02 mas	49.490061	-0.369454		42	W 51N					-0.37	82.28
	+19 23 39.97	+14 31 6.41097	-451.77 mas	210.57 mas	49.490052	-0.369295		43	W 51N					-0.02	3118.9
	+19 23 40.0074	+14 31 6.17409	110.14 mas	-26.31 mas	49.490065	-0.369459		44	W 51N					0.51	40.85
	+19 23 40.0053	+14 31 6.16452	78.56 mas	-35.88 mas	49.490059	-0.369453		45	W 51N					0.77	152.09
	+19 23 40.001	+14 31 6.27114	14 mas	70.74 mas	49.490077	-0.369423		46	W 51N					1.45	43.04
	+19 23 39.9701	+14 31 6.41349	-450.39 mas	213.09 mas	49.490052	-0.369295		47	W 51N					1.66	11.76
	+19 23 39.9701	+14 31 6.40517	-449.59 mas	204.77 mas	49.490051	-0.369296		48	W 51N					2.18	15.28
	+19 23 40.0062	+14 31 6.17128	92.38 mas	-29.12 mas	49.490062	-0.369455		49	W 51N					2.35	63.23
	+19 23 40.0478	+14 31 6.58077	715.06 mas	380.37 mas	49.490242	-0.369549		50	W 51N					2.41	32.03
	+19 23 40.0078	+14 31 6.17681	115.64 mas	-23.59 mas	49.490066	-0.369460		51	W 51N					2.59	35.71
	+19 23 40.0056	+14 31 6.1718	82.42 mas	-28.6 mas	49.490061	-0.369453		52	W 51N					3.42	21.9
	+19 23 40.0422	+14 31 5.82763	632.26 mas	-372.77 mas	49.490047	-0.369628		53	W 51N					3.56	16.75
	+19 23 39.976	+14 31 6.64651	-361.44 mas	446.11 mas	49.490121	-0.369285		54	W 51N					4.23	72.44
	+19 23 40.0067	+14 31 6.28116	100.03 mas	80.76 mas	49.490090	-0.369443		55	W 51N					4.35	67.69
	+19 23 40.057	+14 31 6.87405	853.8 mas	673.65 mas	49.490331	-0.369543		56	W 51N					4.5	44.09
	+19 23 40.0068	+14 31 6.19797	100.48 mas	-2.43 mas	49.490070	-0.369454		57	W 51N					4.55	38.64
	+19 23 39.9725	+14 31 6.71094	-413.52 mas	510.54 mas	49.490130	-0.369264		58	W 51N					5.13	170.9
	+19 23 39.9732	+14 31 6.53664	-403.21 mas	336.24 mas	49.490089	-0.369290		59	W 51N					5.18	570.01
	+19 23 39.976	+14 31 6.6448	-360.93 mas	444.4 mas	49.490120	-0.369286		60	W 51N					5.74	812
	+19 23 39.976	+14 31 6.64563	-361.75 mas	445.23 mas	49.490121	-0.369285		61	W 51N					6.3	93.88
	+19 23 39.976	+14 31 6.64809	-361.34 mas	447.69 mas	49.490121	-0.369285		62	W 51N					6.36	7974.74
	+19 23 40.0394	+14 31 5.59038	589.86 mas	-610.02 mas	49.489983	-0.369649		63	W 51N					6.51	17.93
	+19 23 39.9776	+14 31 6.67526	-337.35 mas	474.86 mas	49.490131	-0.369287		64	W 51N					6.65	64.81
	+19 23 39.97	+14 31 6.5633	-450.98 mas	362.9 mas	49.490089	-0.369275		65	W 51N					7.1	115.27
	+19 23 39.9653	+14 31 5.52915	-521.11 mas	-671.25 mas	49.489827	-0.369394		66	W 51N					9.17	44.25
	+19 23 39.7734	+14 31 6.32442	-3400.86 mas	124.02 mas	49.489656	-0.368607		67	W 51N					9.46	37.96
	+19 23 39.7733	+14 31 6.32539	-3402.38 mas	124.99 mas	49.489656	-0.368607		68	W 51N					11.25	20.03
	+19 23 40.0048	+14 31 6.24129	71 mas	40.89 mas	49.490077	-0.369441		69	W 51N					11.39	29.73
	+19 23 40.0059	+14 31 6.26689	87.59 mas	66.49 mas	49.490085	-0.369441		70	W 51N					11.41	34.61
	+19 23 39.9707	+14 31 6.587	-440.58 mas	386.6 mas	49.490096	-0.369274		71	W 51N					11.56	3.49
	+19 23 40.0557	+14 31 6.88104	834.84 mas	680.64 mas	49.490330	-0.369538		72	W 51N					12.01	21.1
	+19 23 40.0077	+14 31 6.17635	114.77 mas	-24.05 mas	49.490066	-0.369460		73	W 51N					12.15	6.75
	+19 23 39.9725	+14 31 6.5562	-413.23 mas	355.8 mas	49.490092	-0.369285		74	W 51N					13.06	60.11
	+19 23 40.0553	+14 31 6.88446	828.79 mas	684.06 mas	49.490330	-0.369536		75	W 51N					13.82	75.3
	+19 23 39.9733	+14 31 6.52228	-401.66 mas	321.88 mas	49.490085	-0.369292		76	W 51N					14.12	37.37
	+19 23 40.0558	+14 31 6.88068	835.32 mas	680.28 mas	49.490330	-0.369538		77	W 51N					14.4	140.49
	+19 23 39.9716	+14 31 6.55889	-427.69 mas	358.49 mas	49.490091	-0.369281		78	W 51N					14.79	18.33
	+19 23 40.0573	+14 31 6.82006	857.86 mas	619.66 mas	49.490318	-0.369551		79	W 51N					14.9	7.51
	+19 23 39.9756	+14 31 6.57559	-367.68 mas	375.19 mas	49.490103	-0.369293		80	W 51N					15.21	26.7
	+19 23 39.9742	+14 31 6.58539	-388.12 mas	384.99 mas	49.490102	-0.369287		81	W 51N					15.27	37.7
	+19 23 39.9733	+14 31 6.60632	-401.82 mas	405.92 mas	49.490106	-0.369281		82	W 51N					15.66	33.46
	+19 23 39.9719	+14 31 6.52627	-423.16 mas	325.87 mas	49.490084	-0.369286		83	W 51N					16.14	88.1
	+19 23 39.9989	+14 31 6.33654	-17.07 mas	136.14 mas	49.490089	-0.369408		84	W 51N					16.43	141.38
	+19 23 39.9717	+14 31 6.54703	-426.36 mas	346.63 mas	49.490088	-0.369283		85	W 51N					17.57	37.96
	+19 23 39.9715	+14 31 6.56507	-428.42 mas	364.67 mas	49.490092	-0.369280		86	W 51N					19.87	18.83
	+19 23 39.9733	+14 31 6.52492	-402.29 mas	324.52 mas	49.490086	-0.369292		87	W 51N					19.93	189.65
	+19 23 39.9733	+14 31 6.52804	-401.42 mas	327.64 mas	49.490087	-0.369291		88	W 51N					20.02	8.74
	+19 23 39.9713	+14 31 6.56597	-431.38 mas	365.57 mas	49.490092	-0.369279		89	W 51N					20.07	62.64
	+19 23 39.9741	+14 31 6.58488	-389.02 mas	384.48 mas	49.490102	-0.369287		90	W 51N					20.72	44.34
	+19 23 39.9738	+14 31 6.58569	-394.69 mas	385.29 mas	49.490102	-0.369285		91	W 51N					21.83	29.47
	+19 23 39.9716	+14 31 6.56584	-427.22 mas	365.44 mas	49.490093	-0.369280		92	W 51N					22.12	39.54
	+19 23 39.9725	+14 31 6.47991	-413.7 mas	279.51 mas	49.490073	-0.369295		93	W 51N					22.13	7.02
	+19 23 39.9738	+14 31 6.58459	-393.76 mas	384.19 mas	49.490102	-0.369286		94	W 51N					22.99	75.53
	+19 23 39.9732	+14 31 6.52496	-402.97 mas	324.56 mas	49.490086	-0.369291		95	W 51N					23.91	61.21
	+19 23 39.971	+14 31 6.55866	-435.49 mas	358.26 mas	49.490090	-0.369279		96	W 51N					24.19	42.87
	+19 23 39.9732	+14 31 6.52342	-402.62 mas	323.02 mas	49.490085	-0.369292		97	W 51N					24.48	22.56
	+19 23 39.9719	+14 31 6.43219	-422.76 mas	231.79 mas	49.490061	-0.369299		98	W 51N					24.85	56.67
	+19 23 39.9722	+14 31 6.55934	-417.88 mas	358.94 mas	49.490092	-0.369283		99	W 51N					25.29	60.51
	+19 23 39.9725	+14 31 6.48086	-414.21 mas	280.46 mas	49.490074	-0.369294		100	W 51N					26.73	26.63
	+19 23 39.9719	+14 31 6.43209	-422.9 mas	231.69 mas	49.490060	-0.369299		101	W 51N					27.35	82.3
	+19 23 39.9725	+14 31 6.48211	-414.44 mas	281.71 mas	49.490074	-0.369294		102	W 51N					27.42	15.4
	+19 23 39.9718	+14 31 6.4264	-424.43 mas	226 mas	49.490059	-0.369299		103	W 51N					29.03	3.33
	+19 23 39.9719	+14 31 6.43143	-422.89 mas	231.03 mas	49.490060	-0.369299		104	W 51N					30.16	22.1
	+19 23 39.9718	+14 31 6.40426	-424.9 mas	203.86 mas	49.490053	-0.369302		105	W 51N					32.26	18.9
	+19 23 39.995	+14 31 6.1601	-76.82 mas	-40.3 mas	49.490038	-0.369417		106	W 51N					33.95	25.26
	+19 23 39.9721	+14 31 6.42537	-419.15 mas	224.97 mas	49.490059	-0.369301		107	W 51N					35.42	9.05
	+19 23 39.9717	+14 31 6.46401	-425.23 mas	263.61 mas	49.490068	-0.369294		108	W 51N					36.75	116.3
	+19 23 39.9715	+14 31 6.41455	-428.83 mas	214.15 mas	49.490055	-0.369300		109	W 51N					41.94	28
	+19 23 39.9715	+14 31 6.41608	-428.82 mas	215.68 mas	49.490056	-0.369300		110	W 51N					44.43	256.34
	+19 23 39.9754	+14 31 6.43015	-370.82 mas	229.75 mas	49.490067	-0.369311		111	W 51N					49.11	3.01
	+19 23 39.9728	+14 31 6.43081	-409.02 mas	230.41 mas	49.490062	-0.369302		112	W 51N					52.89	12.79
	+19 23 39.9718	+14 31 6.41527	-423.54 mas	214.87 mas	49.490056	-0.369301		113	W 51N					54.79	10.9
	+19 23 39.9752	+14 31 6.42891	-373.63 mas	228.51 mas	49.490066	-0.369311		114	W 51N					55.71	8.62
	+19 23 39.972	+14 31 6.42333	-421.19 mas	222.93 mas	49.490059	-0.369300		115	W 51N					55.79	36.98
	+19 23 39.9743	+14 31 6.43661	-386.01 mas	236.21 mas	49.490066	-0.369307		116	W 51N					57.96	59.33
	+19 23 39.972	+14 31 6.42246	-420.92 mas	222.06 mas	49.490058	-0.369301		117	W 51N					58.81	15.24
	+19 23 39.9745	+14 31 6.43264	-383.9 mas	232.24 mas	49.490066	-0.369308		118	W 51N					59.37	5.76
	+19 23 39.9751	+14 31 6.42761	-375.03 mas	227.21 mas	49.490065	-0.369311		119	W 51N					61.86	15.01
	+19 23 39.9717	+14 31 6.41543	-425.92 mas	215.03 mas	49.490056	-0.369300		120	W 51N					62.05	18.6
	+19 23 39.972	+14 31 6.42386	-420.55 mas	223.46 mas	49.490059	-0.369300		121	W 51N					64.05	1701.62
	+19 23 39.9719	+14 31 6.41721	-422.97 mas	216.81 mas	49.490057	-0.369301		122	W 51N					67.83	18.7
	+19 23 39.972	+14 31 6.41533	-421.18 mas	214.93 mas	49.490057	-0.369301		123	W 51N					69.41	124.73
2	+19 23 43.9	+14 30 37.4			49.490444	-0.387074	G49.489-0.387		W 51M	Image	Descr	22 GHz;	-58;158	-92.63 .. 101.63	8.56 .. 3592	J-Net	0.21	22.000	0.0088 x 0.003	+H₂O +OH	SFR		1999 Feb 21 - Oct 21
	+19 23 43.9861	+14 30 36.0498	1289.7 mas	-1350.62 mas	49.490278	-0.387557		1	W 51M					-92.63	38.07
	+19 23 43.8913	+14 30 37.5495	-131.31 mas	149.12 mas	49.490465	-0.387023		2	W 51M					-22.52	19.5
	+19 23 43.8973	+14 30 37.3227	-42.42 mas	-77.73 mas	49.490420	-0.387074		3	W 51M					1.13	696
	+19 23 43.8982	+14 30 37.3592	-28.8 mas	-41.18 mas	49.490431	-0.387072		4	W 51M					2.33	3592
	+19 23 43.8982	+14 30 37.3588	-28.79 mas	-41.63 mas	49.490431	-0.387073		5	W 51M					2.41	2312
	+19 23 43.9004	+14 30 37.4828	4.98 mas	82.41 mas	49.490466	-0.387064		6	W 51M					4.17	182
	+19 23 43.8996	+14 30 37.3896	-6.59 mas	-10.75 mas	49.490441	-0.387074		7	W 51M					4.26	271
	+19 23 43.8996	+14 30 37.3913	-7 mas	-9.13 mas	49.490442	-0.387073		8	W 51M					4.38	176
	+19 23 43.8999	+14 30 37.3885	-2.57 mas	-11.88 mas	49.490441	-0.387075		9	W 51M					5.29	62.38
	+19 23 43.9017	+14 30 37.5313	23.96 mas	130.94 mas	49.490480	-0.387062		10	W 51M					8.29	161.25
	+19 23 43.9	+14 30 37.3844	-1.02 mas	-16 mas	49.490441	-0.387076		11	W 51M					9.82	12.72
	+19 23 43.9017	+14 30 37.5315	24.13 mas	131.12 mas	49.490480	-0.387062		12	W 51M					10.91	74.66
	+19 23 43.9017	+14 30 37.5309	23.64 mas	130.53 mas	49.490480	-0.387062		13	W 51M					12.27	47.13
	+19 23 43.9	+14 30 37.3932	-1.1 mas	-7.21 mas	49.490443	-0.387075		14	W 51M					12.44	40.88
	+19 23 43.9001	+14 30 37.4004	0 mas	0 mas	49.490445	-0.387074		15	W 51M					14.65	562
	+19 23 43.9001	+14 30 37.4003	0.7 mas	-0.11 mas	49.490445	-0.387074		16	W 51M					17.2	110.75
	+19 23 43.9001	+14 30 37.4003	0.87 mas	-0.1 mas	49.490445	-0.387074		17	W 51M					17.45	161
	+19 23 43.9	+14 30 37.3999	-0.82 mas	-0.53 mas	49.490444	-0.387074		18	W 51M					18.59	654.25
	+19 23 43.8979	+14 30 37.245	-32.66 mas	-155.42 mas	49.490403	-0.387087		19	W 51M					18.77	47.69
	+19 23 43.9025	+14 30 37.3272	36.65 mas	-73.17 mas	49.490431	-0.387092		20	W 51M					21.05	171
	+19 23 43.8978	+14 30 37.2322	-34.35 mas	-168.2 mas	49.490399	-0.387088		21	W 51M					23.18	111.75
	+19 23 43.9022	+14 30 37.3007	32.53 mas	-99.7 mas	49.490424	-0.387095		22	W 51M					25.63	214.5
	+19 23 43.8993	+14 30 37.2568	-11.94 mas	-143.57 mas	49.490408	-0.387090		23	W 51M					25.94	99.75
	+19 23 43.9026	+14 30 37.3018	38.07 mas	-98.6 mas	49.490425	-0.387096		24	W 51M					27.24	71
	+19 23 43.8993	+14 30 37.2563	-11.78 mas	-144.06 mas	49.490408	-0.387090		25	W 51M					27.67	14.69
	+19 23 43.908	+14 30 37.232	118.35 mas	-168.44 mas	49.490419	-0.387124		26	W 51M					27.78	76.31
	+19 23 43.8995	+14 30 37.2587	-8.64 mas	-141.69 mas	49.490409	-0.387090		27	W 51M					27.95	236.5
	+19 23 43.8989	+14 30 37.2487	-18.3 mas	-151.66 mas	49.490405	-0.387089		28	W 51M					30.31	18
	+19 23 43.9021	+14 30 37.2962	30.92 mas	-104.23 mas	49.490423	-0.387095		29	W 51M					32.82	202
	+19 23 43.8991	+14 30 37.334	-15.07 mas	-66.38 mas	49.490427	-0.387079		30	W 51M					32.89	132.75
	+19 23 43.8985	+14 30 37.3343	-24.22 mas	-66.13 mas	49.490425	-0.387077		31	W 51M					33.65	35.75
	+19 23 43.9022	+14 30 37.294	32.54 mas	-106.43 mas	49.490423	-0.387096		32	W 51M					36.84	100
	+19 23 43.9024	+14 30 37.2941	34.57 mas	-106.32 mas	49.490423	-0.387096		33	W 51M					38.88	325
	+19 23 43.898	+14 30 37.2331	-30.99 mas	-167.34 mas	49.490400	-0.387089		34	W 51M					39.76	36.81
	+19 23 43.9026	+14 30 37.2924	38.09 mas	-107.99 mas	49.490423	-0.387097		35	W 51M					41.31	86.62
	+19 23 43.9026	+14 30 37.2918	37.25 mas	-108.55 mas	49.490423	-0.387097		36	W 51M					42.74	107.5
	+19 23 43.9026	+14 30 37.291	37.11 mas	-109.39 mas	49.490423	-0.387097		37	W 51M					43.63	1278
	+19 23 43.9028	+14 30 37.4875	40.77 mas	87.07 mas	49.490471	-0.387072		38	W 51M					46.48	37.12
	+19 23 43.902	+14 30 37.285	28.23 mas	-115.36 mas	49.490420	-0.387096		39	W 51M					50.73	25.25
	+19 23 43.8983	+14 30 37.2362	-26.72 mas	-164.19 mas	49.490401	-0.387089		40	W 51M					52.64	16.8
	+19 23 43.8983	+14 30 37.2381	-27.11 mas	-162.25 mas	49.490402	-0.387089		41	W 51M					56.36	69.5
	+19 23 43.9027	+14 30 37.4411	39.75 mas	40.68 mas	49.490460	-0.387078		42	W 51M					59.05	22.37
	+19 23 43.8982	+14 30 37.3186	-28.6 mas	-81.84 mas	49.490421	-0.387078		43	W 51M					61.16	106
	+19 23 43.8999	+14 30 37.2603	-2.27 mas	-140.11 mas	49.490410	-0.387092		44	W 51M					63.03	119
	+19 23 43.9023	+14 30 37.309	32.9 mas	-91.38 mas	49.490427	-0.387094		45	W 51M					65.62	209
	+19 23 43.9011	+14 30 37.2584	14.72 mas	-142.01 mas	49.490412	-0.387096		46	W 51M					67.79	111
	+19 23 43.9019	+14 30 37.0302	27.03 mas	-370.19 mas	49.490358	-0.387129		47	W 51M					80.99	52.75
	+19 23 43.9021	+14 30 37.0232	29.61 mas	-377.16 mas	49.490356	-0.387130		48	W 51M					101.63	8.56
3	+19 23 43.913	+14 30 29.49			49.488533	-0.388159	G49.489-0.387		W 51S			22 GHz;	-58;158	-106.14 .. 15	15.1 .. 1016	J-Net	0.21	22.000	0.0088 x 0.003	+H₂O +OH	SFR		1999 Feb 21 - Oct 21
	+19 23 43.9318	+14 30 29.2299	281.54 mas	-261.33 mas	49.488505	-0.388260		1	W 51S					-106.14	15.10
	+19 23 43.9303	+14 30 29.2357	259.42 mas	-255.53 mas	49.488504	-0.388254		2	W 51S					-91.88	39.82
	+19 23 43.8431	+14 30 29.3462	-1049.26 mas	-145 mas	49.488365	-0.387929		3	W 51S					-7.92	383.00
	+19 23 43.9111	+14 30 29.4849	-29.8 mas	-6.27 mas	49.488528	-0.388152		4	W 51S					-7.26	825.00
	+19 23 43.9128	+14 30 29.4929	-2.93 mas	1.73 mas	49.488533	-0.388158		5	W 51S					0.80	210.00
	+19 23 43.913	+14 30 29.4912	0 mas	0 mas	49.488533	-0.388159		6	W 51S					2.01	390.50
	+19 23 43.8915	+14 30 29.5283	-323.67 mas	37.11 mas	49.488501	-0.388077		7	W 51S					2.50	99.50
	+19 23 43.892	+14 30 29.528	-315.17 mas	36.83 mas	49.488502	-0.388079		8	W 51S					3.99	38.78
	+19 23 43.8951	+14 30 29.5091	-269.53 mas	17.89 mas	49.488504	-0.388092		9	W 51S					4.81	1016.00
	+19 23 43.8578	+14 30 30.0634	-828.27 mas	572.16 mas	49.488568	-0.387887		10	W 51S					15.00	38.56

DSS colored	2MASS colored	WISE colored
PACS color (70-160 um)	SPIRE color (250-500 um)	GLIMPSE 360
SDSS color	IRAC color I1,I2,I4	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM h2o_data_all  LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line"  WHERE ref ilike 'IMA02B' AND detected=true AND hide=false GROUP BY ref

select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all   LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line"  WHERE ref ilike 'IMA02B' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

IMA02B - 3-D Kinematics of Water Masers in the W 51A Region

Interferometry data

View as list of objects

Detection table from Imai et al. (2002B)