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BAY21 - Search for Collisionally Pumped 1720 MHz OH Masers in Star-forming Regions: A VLA Survey of 18 cm OH Masers toward 80 Class I Methanol Masers

Interferometry data

Short title: Bayandina et al. (2021)
Authors: Bayandina, O. S.Val'tts, I. E.Kurtz, S. E.Shakhvorostova, N. N.
Journal: The Astrophysical Journal Supplement Series, Volume 256, Issue 1, id.7, 15 pp.
Bibcode:
PDF:

Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1612,OH_1665,OH_1667,OH_1720

Abstract
Class I methanol masers (cIMMs) and 1720 MHz OH masers are believed to arise from a common collisional pumping mechanism, and both trace shocked gas regions in supernova remnants (SNRs). However, their coexistence in star formation regions (SFRs) and their association with a front of bipolar outflow (a source of shock-stimulated collisional pumping) remain unclear. To search for collisionally pumped OH(1720) masers, we conducted a Very Large Array survey of the 18 cm OH masers and continuum emission toward a sample of 80 SFRs associated with 44 GHz cIMMs. Main-line OH maser emission was detected in 50% of the sample, and OH(1720) maser emission was detected in 20%. Continuum emission was detected in 28% of sources. A catalog of the detected OH masers is presented. Individual OH masers are found in close proximity, and the regions of masers of different transitions are often overlapping. A typical linear projected offset between the OH(1720) and OH(1665) masers is ~0.04 pc. A remarkable number of ~81% of the OH(1720) masers are associated with the continuum emission. The median separation between the targeted 44 GHz cIMMs and OH(1720) masers is ~0.2 pc, which is similar to reported distances between cIMMs and H II regions. The observed properties of the detected OH(1720) masers are different from those in SNRs and indicate that a nonlocal line overlap mechanism is responsible for their excitation. Thus, while both 44 GHz cIMMs and OH(1720) masers trace shocked gas in SNRs, physical conditions favorable for excitation of cIMMs, but not OH(1720) masers, are present in SFRs.

Abstract

Class I methanol masers (cIMMs) and 1720 MHz OH masers are believed to arise from a common collisional pumping mechanism, and both trace shocked gas regions in supernova remnants (SNRs). However, their coexistence in star formation regions (SFRs) and their association with a front of bipolar outflow (a source of shock-stimulated collisional pumping) remain unclear. To search for collisionally pumped OH(1720) masers, we conducted a Very Large Array survey of the 18 cm OH masers and continuum emission toward a sample of 80 SFRs associated with 44 GHz cIMMs. Main-line OH maser emission was detected in 50% of the sample, and OH(1720) maser emission was detected in 20%. Continuum emission was detected in 28% of sources. A catalog of the detected OH masers is presented. Individual OH masers are found in close proximity, and the regions of masers of different transitions are often overlapping. A typical linear projected offset between the OH(1720) and OH(1665) masers is ~0.04 pc. A remarkable number of ~81% of the OH(1720) masers are associated with the continuum emission. The median separation between the targeted 44 GHz cIMMs and OH(1720) masers is ~0.2 pc, which is similar to reported distances between cIMMs and H II regions. The observed properties of the detected OH(1720) masers are different from those in SNRs and indicate that a nonlocal line overlap mechanism is responsible for their excitation. Thus, while both 44 GHz cIMMs and OH(1720) masers trace shocked gas in SNRs, physical conditions favorable for excitation of cIMMs, but not OH(1720) masers, are present in SFRs.

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Detection table from Bayandina et al. (2021)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	grpv	#	Source name	Other name	Image	V_peak	F_peak	Telescope	Configuration	V_step	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					Alias		(km/s)	(Jy/beam)			(km/s)	(Jy/beam)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+17 50 14.6	-28 54 51			0.541756	-0.854653	G0.5418-0.8547	G0.5463-0.8516		G0.54-0.85	RCW142	Image	14.8	0.17 .. 11.98	NRAOVLA	C	0.34	20.000	36.31 x 13.9	21.5	+OH	SFR_MIXED		2013 July - August
	+17 50 14.57	-28 54 30.16	-448.8 mas	20841.2 mas	0.546670	-0.851591			1	G0.54-0.85			9.31	0.68
	+17 50 14.517	-28 54 31.25	-1243.8 mas	19751.2 mas	0.546311	-0.851580			2	G0.54-0.85			11.07	2.17
	+17 50 14.506	-28 54 31.11	-1408.8 mas	19891.2 mas	0.546324	-0.851526			3	G0.54-0.85			12.83	6.22
	+17 50 14.511	-28 54 31.08	-1333.8 mas	19921.2 mas	0.546340	-0.851537			4	G0.54-0.85			14.94	2.01
	+17 50 14.543	-28 54 31.31	-853.8 mas	19691.2 mas	0.546345	-0.851670			5	G0.54-0.85			17.05	1.75
	+17 50 14.553	-28 54 30.99	-703.8 mas	20011.2 mas	0.546440	-0.851656			6	G0.54-0.85			19.16	1.65
	+17 50 14.5	-28 54 31.35	-1498.8 mas	19651.2 mas	0.546255	-0.851541			7	G0.54-0.85			12.13	3.16
	+17 50 14.501	-28 54 31.63	-1483.8 mas	19371.2 mas	0.546190	-0.851584			8	G0.54-0.85			12.83	7.59
	+17 50 14.506	-28 54 32.16	-1408.8 mas	18841.2 mas	0.546073	-0.851676			9	G0.54-0.85			14.24	1.15
	+17 50 14.579	-28 54 30.75	-313.8 mas	20251.2 mas	0.546546	-0.851703			10	G0.54-0.85			17.05	0.75
	+17 50 14.523	-28 54 31.45	-1153.8 mas	19551.2 mas	0.546274	-0.851628			11	G0.54-0.85			18.46	8.54
	+17 50 14.456	-28 54 33.23	-2158.8 mas	17771.2 mas	0.545725	-0.851671			12	G0.54-0.85			19.51	0.95
	+17 50 14.505	-28 54 31.02	-1423.8 mas	19981.2 mas	0.546343	-0.851510			13	G0.54-0.85			4.67	0.57
	+17 50 14.541	-28 54 30.97	-883.8 mas	20031.2 mas	0.546423	-0.851616			14	G0.54-0.85			5.37	0.84
	+17 50 14.516	-28 54 31.25	-1258.8 mas	19751.2 mas	0.546309	-0.851577			15	G0.54-0.85			6.43	2.75
	+17 50 14.504	-28 54 31.45	-1438.8 mas	19551.2 mas	0.546239	-0.851568			16	G0.54-0.85			7.83	1.01
	+17 50 14.516	-28 54 30.18	-1258.8 mas	20821.2 mas	0.546564	-0.851425			17	G0.54-0.85			9.24	0.84
	+17 50 14.489	-28 54 30.15	-1663.8 mas	20851.2 mas	0.546521	-0.851336			18	G0.54-0.85			10.64	0.7
	+17 50 14.517	-28 54 31.19	-1243.8 mas	19811.2 mas	0.546325	-0.851572			19	G0.54-0.85			13.1	3.71
	+17 50 14.503	-28 54 30.92	-1453.8 mas	20081.2 mas	0.546363	-0.851490			20	G0.54-0.85			15.56	0.96
	+17 50 14.554	-28 54 30.4	-688.8 mas	20601.2 mas	0.546583	-0.851575			21	G0.54-0.85			6.08	1.34
	+17 50 14.416	-28 54 32.17	-2758.8 mas	18831.2 mas	0.545903	-0.851395			22	G0.54-0.85			7.48	0.97
	+17 50 14.473	-28 54 31.81	-1903.8 mas	19191.2 mas	0.546095	-0.851522			23	G0.54-0.85			8.18	0.77
	+17 50 14.447	-28 54 32.15	-2293.8 mas	18851.2 mas	0.545965	-0.851489			24	G0.54-0.85			9.24	0.41
	+17 50 14.462	-28 54 31.78	-2068.8 mas	19221.2 mas	0.546082	-0.851484			25	G0.54-0.85			10.29	1.3
	+17 50 14.529	-28 54 30.69	-1063.8 mas	20311.2 mas	0.546467	-0.851538			26	G0.54-0.85			10.99	1.04
	+17 50 14.509	-28 54 31.45	-1363.8 mas	19551.2 mas	0.546248	-0.851584			27	G0.54-0.85			13.1	7.38
	+17 50 14.5	-28 54 31.67	-1498.8 mas	19331.2 mas	0.546179	-0.851587			28	G0.54-0.85			13.8	11.98
	+17 50 14.546	-28 54 31.33	-808.8 mas	19671.2 mas	0.546346	-0.851683			29	G0.54-0.85			14.86	1.59
	+17 50 14.327	-28 54 22.42	-4093.8 mas	28581.2 mas	0.548062	-0.849728			30	G0.54-0.85			20.84	0.17
2	+18 00 30.3	-24 03 59			5.885575	-0.391659	G5.885-0.392	G5.8852-0.3924		G5.89-0.39	W28-A2	Image	8.8	0.35 .. 17.44	NRAOVLA	C	0.34	20.000	31.66 x 13.86	24.13	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2013 July - August
	+18 00 30.403	-24 04 1.51	1545 mas	-2509.6 mas	5.885165	-0.392345			1	G5.89-0.39			-21.56	12.39
	+18 00 30.388	-24 04 1.39	1320 mas	-2389.6 mas	5.885165	-0.392279			2	G5.89-0.39			-20.11	3.02
	+18 00 30.399	-24 04 1.17	1485 mas	-2169.6 mas	5.885239	-0.392285			3	G5.89-0.39			-19.38	2.48
	+18 00 30.442	-24 04 3.1	2130 mas	-4099.6 mas	5.884855	-0.392693			4	G5.89-0.39			6.77	1.74
	+18 00 30.36	-24 04 3.29	900 mas	-4289.6 mas	5.884654	-0.392449			5	G5.89-0.39			8.22	0.82
	+18 00 30.379	-24 04 3.55	1185 mas	-4549.6 mas	5.884627	-0.392547			6	G5.89-0.39			12.58	1.58
	+18 00 30.405	-24 04 1.54	1575 mas	-2539.6 mas	5.885161	-0.392356			7	G5.89-0.39			-21.56	12.51
	+18 00 30.395	-24 04 1.22	1425 mas	-2219.6 mas	5.885219	-0.392279			8	G5.89-0.39			-20.11	3.43
	+18 00 30.404	-24 04 0.92	1560 mas	-1919.6 mas	5.885309	-0.392267			9	G5.89-0.39			-19.38	2.38
	+18 00 30.403	-24 04 3.43	1545 mas	-4429.6 mas	5.884702	-0.392610			10	G5.89-0.39			6.77	0.91
	+18 00 30.424	-24 04 2.29	1860 mas	-3289.6 mas	5.885016	-0.392522			11	G5.89-0.39			8.22	0.53
	+18 00 30.492	-24 04 2.64	2880 mas	-3639.6 mas	5.885060	-0.392795			12	G5.89-0.39			10.04	0.46
	+18 00 30.401	-24 04 3.48	1515 mas	-4479.6 mas	5.884686	-0.392610			13	G5.89-0.39			13.31	1.4
	+18 00 30.366	-24 03 59.85	990 mas	-849.6 mas	5.885495	-0.391994			14	G5.89-0.39			14.76	0.4
	+18 00 30.426	-24 04 2.83	1890 mas	-3829.6 mas	5.884890	-0.392603			15	G5.89-0.39			-28.22	0.94
	+18 00 30.366	-24 04 5.11	990 mas	-6109.6 mas	5.884227	-0.392719			16	G5.89-0.39			-26.81	0.44
	+18 00 30.387	-24 04 2.06	1305 mas	-3059.6 mas	5.885002	-0.392368			17	G5.89-0.39			-25.05	1.63
	+18 00 30.427	-24 04 2.73	1905 mas	-3729.6 mas	5.884916	-0.392593			18	G5.89-0.39			-22.59	0.65
	+18 00 30.281	-24 04 4.14	-285 mas	-5139.6 mas	5.884300	-0.392305			19	G5.89-0.39			-20.13	0.35
	+18 00 30.424	-24 04 2.15	1860 mas	-3149.6 mas	5.885050	-0.392503			20	G5.89-0.39			-19.08	1.37
	+18 00 30.453	-24 04 1.7	2295 mas	-2699.6 mas	5.885213	-0.392536			21	G5.89-0.39			-18.37	1.96
	+18 00 30.464	-24 04 0.64	2460 mas	-1639.6 mas	5.885490	-0.392427			22	G5.89-0.39			-13.45	1.33
	+18 00 30.529	-24 04 1.88	3435 mas	-2879.6 mas	5.885313	-0.392812			23	G5.89-0.39			-8.88	0.77
	+18 00 30.406	-24 04 3.24	1590 mas	-4239.6 mas	5.884753	-0.392594			24	G5.89-0.39			-4.66	1.06
	+18 00 30.377	-24 04 2.81	1155 mas	-3809.6 mas	5.884802	-0.392438			25	G5.89-0.39			-2.55	0.52
	+18 00 30.375	-24 04 3.41	1125 mas	-4409.6 mas	5.884654	-0.392515			26	G5.89-0.39			-1.5	1.42
	+18 00 30.377	-24 04 3.19	1155 mas	-4189.6 mas	5.884710	-0.392491			27	G5.89-0.39			-0.44	0.83
	+18 00 30.351	-24 04 3.39	765 mas	-4389.6 mas	5.884613	-0.392433			28	G5.89-0.39			2.72	5.63
	+18 00 30.381	-24 04 3.32	1215 mas	-4319.6 mas	5.884687	-0.392522			29	G5.89-0.39			4.13	1.66
	+18 00 30.428	-24 04 3.46	1920 mas	-4459.6 mas	5.884742	-0.392697			30	G5.89-0.39			6.59	1.79
	+18 00 30.45	-24 04 2.81	2250 mas	-3809.6 mas	5.884940	-0.392680			31	G5.89-0.39			7.3	2.93
	+18 00 30.388	-24 04 4.13	1320 mas	-5129.6 mas	5.884504	-0.392657			32	G5.89-0.39			8	1.49
	+18 00 30.579	-24 04 2.2	4185 mas	-3199.6 mas	5.885331	-0.393022			33	G5.89-0.39			9.05	2.84
	+18 00 30.626	-24 04 2.69	4890 mas	-3689.6 mas	5.885301	-0.393244			34	G5.89-0.39			10.46	6.49
	+18 00 30.394	-24 04 3.78	1410 mas	-4779.6 mas	5.884600	-0.392628			35	G5.89-0.39			12.6	3.7
	+18 00 30.355	-24 04 4.05	825 mas	-5049.6 mas	5.884461	-0.392537			36	G5.89-0.39			14.68	2.55
	+18 00 30.409	-24 04 1.62	1635 mas	-2619.6 mas	5.885149	-0.392380			37	G5.89-0.39			-25.4	1.68
	+18 00 30.454	-24 04 2.84	2310 mas	-3839.6 mas	5.884940	-0.392697			38	G5.89-0.39			-23.3	0.61
	+18 00 30.414	-24 04 1.79	1710 mas	-2789.6 mas	5.885118	-0.392420			39	G5.89-0.39			-20.13	0.67
	+18 00 30.395	-24 04 2.53	1425 mas	-3529.6 mas	5.884903	-0.392459			40	G5.89-0.39			-19.08	1.71
	+18 00 30.408	-24 04 3.76	1620 mas	-4759.6 mas	5.884631	-0.392672			41	G5.89-0.39			-18.37	0.86
	+18 00 30.504	-24 04 1.06	3060 mas	-2059.6 mas	5.885464	-0.392617			42	G5.89-0.39			-14.5	0.8
	+18 00 30.353	-24 04 3.31	795 mas	-4309.6 mas	5.884636	-0.392428			43	G5.89-0.39			2.72	5.51
	+18 00 30.432	-24 04 3.22	1980 mas	-4219.6 mas	5.884807	-0.392677			44	G5.89-0.39			4.48	1.77
	+18 00 30.416	-24 04 3.34	1740 mas	-4339.6 mas	5.884748	-0.392640			45	G5.89-0.39			5.89	2.43
	+18 00 30.383	-24 04 3.49	1245 mas	-4489.6 mas	5.884649	-0.392552			46	G5.89-0.39			7.3	3.43
	+18 00 30.561	-24 04 2.49	3915 mas	-3489.6 mas	5.885227	-0.393002			47	G5.89-0.39			8	3.45
	+18 00 30.61	-24 04 2.07	4650 mas	-3069.6 mas	5.885420	-0.393106			48	G5.89-0.39			9.4	5.76
	+18 00 30.523	-24 04 3.31	3345 mas	-4309.6 mas	5.884957	-0.392990			49	G5.89-0.39			10.81	5.45
	+18 00 30.538	-24 04 3.46	3570 mas	-4459.6 mas	5.884949	-0.393060			50	G5.89-0.39			11.87	3.11
	+18 00 30.42	-24 04 3.48	1800 mas	-4479.6 mas	5.884722	-0.392673			51	G5.89-0.39			12.57	2.47
	+18 00 30.362	-24 04 3.77	930 mas	-4769.6 mas	5.884542	-0.392521			52	G5.89-0.39			13.62	6.6
	+18 00 30.36	-24 04 3.91	900 mas	-4909.6 mas	5.884505	-0.392534			53	G5.89-0.39			14.33	5.27
	+18 00 30.368	-24 04 0.23	1020 mas	-1229.6 mas	5.885407	-0.392053			54	G5.89-0.39			17.49	0.94
	+18 00 30.338	-24 04 0.19	570 mas	-1189.6 mas	5.885360	-0.391948			55	G5.89-0.39			-41.94	7.27
	+18 00 30.353	-24 04 0.26	795 mas	-1259.6 mas	5.885372	-0.392008			56	G5.89-0.39			-40.54	6.17
	+18 00 30.46	-24 04 0.99	2400 mas	-1989.6 mas	5.885398	-0.392462			57	G5.89-0.39			-33.16	3.77
	+18 00 30.422	-24 04 0.9	1830 mas	-1899.6 mas	5.885348	-0.392324			58	G5.89-0.39			-31.41	7.89
	+18 00 30.388	-24 04 1.25	1320 mas	-2249.6 mas	5.885199	-0.392260			59	G5.89-0.39			-29.3	14.69
	+18 00 30.427	-24 04 1.36	1905 mas	-2359.6 mas	5.885246	-0.392404			60	G5.89-0.39			-26.84	15.39
	+18 00 30.409	-24 04 1.51	1635 mas	-2509.6 mas	5.885176	-0.392365			61	G5.89-0.39			-25.44	7.33
	+18 00 30.424	-24 04 1.74	1860 mas	-2739.6 mas	5.885149	-0.392446			62	G5.89-0.39			-22.63	4.7
	+18 00 30.398	-24 04 2.64	1470 mas	-3639.6 mas	5.884883	-0.392484			63	G5.89-0.39			-20.87	3.21
	+18 00 30.396	-24 04 2.5	1440 mas	-3499.6 mas	5.884913	-0.392458			64	G5.89-0.39			-19.82	4.92
	+18 00 30.382	-24 04 2.9	1230 mas	-3899.6 mas	5.884790	-0.392467			65	G5.89-0.39			-18.41	3.93
	+18 00 30.581	-24 04 1.54	4215 mas	-2539.6 mas	5.885493	-0.392937			66	G5.89-0.39			-16.31	3.25
	+18 00 30.558	-24 04 1.51	3870 mas	-2509.6 mas	5.885457	-0.392857			67	G5.89-0.39			-14.9	2.37
	+18 00 30.578	-24 04 0.76	4170 mas	-1759.6 mas	5.885676	-0.392820			68	G5.89-0.39			-11.39	1.72
	+18 00 30.35	-24 04 4.09	750 mas	-5089.6 mas	5.884442	-0.392526			69	G5.89-0.39			-1.21	1.42
	+18 00 30.341	-24 04 4.15	615 mas	-5149.6 mas	5.884411	-0.392504			70	G5.89-0.39			-0.15	1.02
	+18 00 30.419	-24 04 4.21	1785 mas	-5209.6 mas	5.884544	-0.392770			71	G5.89-0.39			4.41	1.87
	+18 00 30.43	-24 04 3.26	1950 mas	-4259.6 mas	5.884794	-0.392676			72	G5.89-0.39			5.12	1.69
	+18 00 30.378	-24 04 4.29	1170 mas	-5289.6 mas	5.884447	-0.392646			73	G5.89-0.39			7.22	2.38
	+18 00 30.468	-24 04 3.06	2520 mas	-4059.6 mas	5.884914	-0.392773			74	G5.89-0.39			7.93	1.15
	+18 00 30.528	-24 04 2.55	3420 mas	-3549.6 mas	5.885150	-0.392901			75	G5.89-0.39			8.63	1.6
	+18 00 30.523	-24 04 2.64	3345 mas	-3639.6 mas	5.885119	-0.392897			76	G5.89-0.39			9.33	2.93
	+18 00 30.631	-24 04 2.1	4965 mas	-3099.6 mas	5.885453	-0.393179			77	G5.89-0.39			10.38	8.06
	+18 00 30.488	-24 04 2.85	2820 mas	-3849.6 mas	5.885002	-0.392811			78	G5.89-0.39			11.09	1.92
	+18 00 30.453	-24 04 2.19	2295 mas	-3189.6 mas	5.885095	-0.392604			79	G5.89-0.39			11.79	1.46
	+18 00 30.425	-24 04 3.11	1875 mas	-4109.6 mas	5.884820	-0.392638			80	G5.89-0.39			12.49	2.32
	+18 00 30.359	-24 04 3.82	885 mas	-4819.6 mas	5.884524	-0.392518			81	G5.89-0.39			14.6	8.08
	+18 00 30.345	-24 04 0.12	675 mas	-1119.6 mas	5.885390	-0.391962			82	G5.89-0.39			-41.94	7.09
	+18 00 30.35	-24 04 0.26	750 mas	-1259.6 mas	5.885366	-0.391998			83	G5.89-0.39			-40.89	6.08
	+18 00 30.486	-24 04 0.75	2790 mas	-1749.6 mas	5.885505	-0.392514			84	G5.89-0.39			-33.51	3.71
	+18 00 30.429	-24 04 1.02	1935 mas	-2019.6 mas	5.885332	-0.392363			85	G5.89-0.39			-31.41	6.28
	+18 00 30.395	-24 04 1.36	1425 mas	-2359.6 mas	5.885186	-0.392298			86	G5.89-0.39			-29.3	13.09
	+18 00 30.429	-24 04 1.68	1935 mas	-2679.6 mas	5.885173	-0.392454			87	G5.89-0.39			-26.14	17.44
	+18 00 30.42	-24 04 2.02	1800 mas	-3019.6 mas	5.885074	-0.392472			88	G5.89-0.39			-22.98	6.08
	+18 00 30.393	-24 04 2.57	1395 mas	-3569.6 mas	5.884890	-0.392458			89	G5.89-0.39			-22.28	5.26
	+18 00 30.388	-24 04 2.75	1320 mas	-3749.6 mas	5.884837	-0.392467			90	G5.89-0.39			-21.22	8.02
	+18 00 30.395	-24 04 2.76	1425 mas	-3759.6 mas	5.884848	-0.392491			91	G5.89-0.39			-20.52	8.14
	+18 00 30.391	-24 04 2.97	1365 mas	-3969.6 mas	5.884790	-0.392507			92	G5.89-0.39			-19.12	16.15
	+18 00 30.59	-24 04 1.57	4350 mas	-2569.6 mas	5.885503	-0.392971			93	G5.89-0.39			-16.66	5.4
	+18 00 30.559	-24 04 1.58	3885 mas	-2579.6 mas	5.885442	-0.392870			94	G5.89-0.39			-15.25	3.18
	+18 00 30.537	-24 04 0.76	3555 mas	-1759.6 mas	5.885598	-0.392684			95	G5.89-0.39			-14.2	1.14
	+18 00 30.566	-24 04 1.25	3990 mas	-2249.6 mas	5.885535	-0.392848			96	G5.89-0.39			-11.74	1.43
	+18 00 30.285	-24 04 2.63	-225 mas	-3629.6 mas	5.884672	-0.392110			97	G5.89-0.39			-1.21	0.74
	+18 00 30.342	-24 04 4.64	630 mas	-5639.6 mas	5.884295	-0.392575			98	G5.89-0.39			-0.15	1.65
	+18 00 30.345	-24 04 4.05	675 mas	-5049.6 mas	5.884443	-0.392504			99	G5.89-0.39			0.9	1.04
	+18 00 30.402	-24 04 4.3	1530 mas	-5299.6 mas	5.884490	-0.392726			100	G5.89-0.39			4.77	2.35
	+18 00 30.399	-24 04 4.11	1485 mas	-5109.6 mas	5.884530	-0.392690			101	G5.89-0.39			6.17	2.08
	+18 00 30.618	-24 04 2.1	4770 mas	-3099.6 mas	5.885428	-0.393137			102	G5.89-0.39			9.68	11.9
	+18 00 30.386	-24 04 3.83	1290 mas	-4829.6 mas	5.884573	-0.392609			103	G5.89-0.39			11.09	1.49
	+18 00 30.377	-24 04 3.63	1155 mas	-4629.6 mas	5.884604	-0.392552			104	G5.89-0.39			13.54	7.16
	+18 00 30.367	-24 04 3.87	1005 mas	-4869.6 mas	5.884527	-0.392552			105	G5.89-0.39			14.25	10.12
	+18 00 30.536	-24 04 4.65	3540 mas	-5649.6 mas	5.884659	-0.393217			106	G5.89-0.39			-15.08	0.6
	+18 00 30.57	-24 04 1.71	4050 mas	-2709.6 mas	5.885432	-0.392924			107	G5.89-0.39			-16.45	0.6
	+18 00 30.3	-24 03 59			5.885575	-0.391659	G5.885-0.392	G5.8852-0.3924		G5.89-0.39	W28-A2	Image	8.8	0.35 .. 17.44	NRAOVLA	C	0.34	20.000	31.66 x 13.86	24.13	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		2013 July - August
	+18 00 30.403	-24 04 1.51	1545 mas	-2509.6 mas	5.885165	-0.392345			1	G5.89-0.39			-21.56	12.39
	+18 00 30.388	-24 04 1.39	1320 mas	-2389.6 mas	5.885165	-0.392279			2	G5.89-0.39			-20.11	3.02
	+18 00 30.399	-24 04 1.17	1485 mas	-2169.6 mas	5.885239	-0.392285			3	G5.89-0.39			-19.38	2.48
	+18 00 30.442	-24 04 3.1	2130 mas	-4099.6 mas	5.884855	-0.392693			4	G5.89-0.39			6.77	1.74
	+18 00 30.36	-24 04 3.29	900 mas	-4289.6 mas	5.884654	-0.392449			5	G5.89-0.39			8.22	0.82
	+18 00 30.379	-24 04 3.55	1185 mas	-4549.6 mas	5.884627	-0.392547			6	G5.89-0.39			12.58	1.58
	+18 00 30.405	-24 04 1.54	1575 mas	-2539.6 mas	5.885161	-0.392356			7	G5.89-0.39			-21.56	12.51
	+18 00 30.395	-24 04 1.22	1425 mas	-2219.6 mas	5.885219	-0.392279			8	G5.89-0.39			-20.11	3.43
	+18 00 30.404	-24 04 0.92	1560 mas	-1919.6 mas	5.885309	-0.392267			9	G5.89-0.39			-19.38	2.38
	+18 00 30.403	-24 04 3.43	1545 mas	-4429.6 mas	5.884702	-0.392610			10	G5.89-0.39			6.77	0.91
	+18 00 30.424	-24 04 2.29	1860 mas	-3289.6 mas	5.885016	-0.392522			11	G5.89-0.39			8.22	0.53
	+18 00 30.492	-24 04 2.64	2880 mas	-3639.6 mas	5.885060	-0.392795			12	G5.89-0.39			10.04	0.46
	+18 00 30.401	-24 04 3.48	1515 mas	-4479.6 mas	5.884686	-0.392610			13	G5.89-0.39			13.31	1.4
	+18 00 30.366	-24 03 59.85	990 mas	-849.6 mas	5.885495	-0.391994			14	G5.89-0.39			14.76	0.4
	+18 00 30.426	-24 04 2.83	1890 mas	-3829.6 mas	5.884890	-0.392603			15	G5.89-0.39			-28.22	0.94
	+18 00 30.366	-24 04 5.11	990 mas	-6109.6 mas	5.884227	-0.392719			16	G5.89-0.39			-26.81	0.44
	+18 00 30.387	-24 04 2.06	1305 mas	-3059.6 mas	5.885002	-0.392368			17	G5.89-0.39			-25.05	1.63
	+18 00 30.427	-24 04 2.73	1905 mas	-3729.6 mas	5.884916	-0.392593			18	G5.89-0.39			-22.59	0.65
	+18 00 30.281	-24 04 4.14	-285 mas	-5139.6 mas	5.884300	-0.392305			19	G5.89-0.39			-20.13	0.35
	+18 00 30.424	-24 04 2.15	1860 mas	-3149.6 mas	5.885050	-0.392503			20	G5.89-0.39			-19.08	1.37
	+18 00 30.453	-24 04 1.7	2295 mas	-2699.6 mas	5.885213	-0.392536			21	G5.89-0.39			-18.37	1.96
	+18 00 30.464	-24 04 0.64	2460 mas	-1639.6 mas	5.885490	-0.392427			22	G5.89-0.39			-13.45	1.33
	+18 00 30.529	-24 04 1.88	3435 mas	-2879.6 mas	5.885313	-0.392812			23	G5.89-0.39			-8.88	0.77
	+18 00 30.406	-24 04 3.24	1590 mas	-4239.6 mas	5.884753	-0.392594			24	G5.89-0.39			-4.66	1.06
	+18 00 30.377	-24 04 2.81	1155 mas	-3809.6 mas	5.884802	-0.392438			25	G5.89-0.39			-2.55	0.52
	+18 00 30.375	-24 04 3.41	1125 mas	-4409.6 mas	5.884654	-0.392515			26	G5.89-0.39			-1.5	1.42
	+18 00 30.377	-24 04 3.19	1155 mas	-4189.6 mas	5.884710	-0.392491			27	G5.89-0.39			-0.44	0.83
	+18 00 30.351	-24 04 3.39	765 mas	-4389.6 mas	5.884613	-0.392433			28	G5.89-0.39			2.72	5.63
	+18 00 30.381	-24 04 3.32	1215 mas	-4319.6 mas	5.884687	-0.392522			29	G5.89-0.39			4.13	1.66
	+18 00 30.428	-24 04 3.46	1920 mas	-4459.6 mas	5.884742	-0.392697			30	G5.89-0.39			6.59	1.79
	+18 00 30.45	-24 04 2.81	2250 mas	-3809.6 mas	5.884940	-0.392680			31	G5.89-0.39			7.3	2.93
	+18 00 30.388	-24 04 4.13	1320 mas	-5129.6 mas	5.884504	-0.392657			32	G5.89-0.39			8	1.49
	+18 00 30.579	-24 04 2.2	4185 mas	-3199.6 mas	5.885331	-0.393022			33	G5.89-0.39			9.05	2.84
	+18 00 30.626	-24 04 2.69	4890 mas	-3689.6 mas	5.885301	-0.393244			34	G5.89-0.39			10.46	6.49
	+18 00 30.394	-24 04 3.78	1410 mas	-4779.6 mas	5.884600	-0.392628			35	G5.89-0.39			12.6	3.7
	+18 00 30.355	-24 04 4.05	825 mas	-5049.6 mas	5.884461	-0.392537			36	G5.89-0.39			14.68	2.55
	+18 00 30.409	-24 04 1.62	1635 mas	-2619.6 mas	5.885149	-0.392380			37	G5.89-0.39			-25.4	1.68
	+18 00 30.454	-24 04 2.84	2310 mas	-3839.6 mas	5.884940	-0.392697			38	G5.89-0.39			-23.3	0.61
	+18 00 30.414	-24 04 1.79	1710 mas	-2789.6 mas	5.885118	-0.392420			39	G5.89-0.39			-20.13	0.67
	+18 00 30.395	-24 04 2.53	1425 mas	-3529.6 mas	5.884903	-0.392459			40	G5.89-0.39			-19.08	1.71
	+18 00 30.408	-24 04 3.76	1620 mas	-4759.6 mas	5.884631	-0.392672			41	G5.89-0.39			-18.37	0.86
	+18 00 30.504	-24 04 1.06	3060 mas	-2059.6 mas	5.885464	-0.392617			42	G5.89-0.39			-14.5	0.8
	+18 00 30.353	-24 04 3.31	795 mas	-4309.6 mas	5.884636	-0.392428			43	G5.89-0.39			2.72	5.51
	+18 00 30.432	-24 04 3.22	1980 mas	-4219.6 mas	5.884807	-0.392677			44	G5.89-0.39			4.48	1.77
	+18 00 30.416	-24 04 3.34	1740 mas	-4339.6 mas	5.884748	-0.392640			45	G5.89-0.39			5.89	2.43
	+18 00 30.383	-24 04 3.49	1245 mas	-4489.6 mas	5.884649	-0.392552			46	G5.89-0.39			7.3	3.43
	+18 00 30.561	-24 04 2.49	3915 mas	-3489.6 mas	5.885227	-0.393002			47	G5.89-0.39			8	3.45
	+18 00 30.61	-24 04 2.07	4650 mas	-3069.6 mas	5.885420	-0.393106			48	G5.89-0.39			9.4	5.76
	+18 00 30.523	-24 04 3.31	3345 mas	-4309.6 mas	5.884957	-0.392990			49	G5.89-0.39			10.81	5.45
	+18 00 30.538	-24 04 3.46	3570 mas	-4459.6 mas	5.884949	-0.393060			50	G5.89-0.39			11.87	3.11
	+18 00 30.42	-24 04 3.48	1800 mas	-4479.6 mas	5.884722	-0.392673			51	G5.89-0.39			12.57	2.47
	+18 00 30.362	-24 04 3.77	930 mas	-4769.6 mas	5.884542	-0.392521			52	G5.89-0.39			13.62	6.6
	+18 00 30.36	-24 04 3.91	900 mas	-4909.6 mas	5.884505	-0.392534			53	G5.89-0.39			14.33	5.27
	+18 00 30.368	-24 04 0.23	1020 mas	-1229.6 mas	5.885407	-0.392053			54	G5.89-0.39			17.49	0.94
	+18 00 30.338	-24 04 0.19	570 mas	-1189.6 mas	5.885360	-0.391948			55	G5.89-0.39			-41.94	7.27
	+18 00 30.353	-24 04 0.26	795 mas	-1259.6 mas	5.885372	-0.392008			56	G5.89-0.39			-40.54	6.17
	+18 00 30.46	-24 04 0.99	2400 mas	-1989.6 mas	5.885398	-0.392462			57	G5.89-0.39			-33.16	3.77
	+18 00 30.422	-24 04 0.9	1830 mas	-1899.6 mas	5.885348	-0.392324			58	G5.89-0.39			-31.41	7.89
	+18 00 30.388	-24 04 1.25	1320 mas	-2249.6 mas	5.885199	-0.392260			59	G5.89-0.39			-29.3	14.69
	+18 00 30.427	-24 04 1.36	1905 mas	-2359.6 mas	5.885246	-0.392404			60	G5.89-0.39			-26.84	15.39
	+18 00 30.409	-24 04 1.51	1635 mas	-2509.6 mas	5.885176	-0.392365			61	G5.89-0.39			-25.44	7.33
	+18 00 30.424	-24 04 1.74	1860 mas	-2739.6 mas	5.885149	-0.392446			62	G5.89-0.39			-22.63	4.7
	+18 00 30.398	-24 04 2.64	1470 mas	-3639.6 mas	5.884883	-0.392484			63	G5.89-0.39			-20.87	3.21
	+18 00 30.396	-24 04 2.5	1440 mas	-3499.6 mas	5.884913	-0.392458			64	G5.89-0.39			-19.82	4.92
	+18 00 30.382	-24 04 2.9	1230 mas	-3899.6 mas	5.884790	-0.392467			65	G5.89-0.39			-18.41	3.93
	+18 00 30.581	-24 04 1.54	4215 mas	-2539.6 mas	5.885493	-0.392937			66	G5.89-0.39			-16.31	3.25
	+18 00 30.558	-24 04 1.51	3870 mas	-2509.6 mas	5.885457	-0.392857			67	G5.89-0.39			-14.9	2.37
	+18 00 30.578	-24 04 0.76	4170 mas	-1759.6 mas	5.885676	-0.392820			68	G5.89-0.39			-11.39	1.72
	+18 00 30.35	-24 04 4.09	750 mas	-5089.6 mas	5.884442	-0.392526			69	G5.89-0.39			-1.21	1.42
	+18 00 30.341	-24 04 4.15	615 mas	-5149.6 mas	5.884411	-0.392504			70	G5.89-0.39			-0.15	1.02
	+18 00 30.419	-24 04 4.21	1785 mas	-5209.6 mas	5.884544	-0.392770			71	G5.89-0.39			4.41	1.87
	+18 00 30.43	-24 04 3.26	1950 mas	-4259.6 mas	5.884794	-0.392676			72	G5.89-0.39			5.12	1.69
	+18 00 30.378	-24 04 4.29	1170 mas	-5289.6 mas	5.884447	-0.392646			73	G5.89-0.39			7.22	2.38
	+18 00 30.468	-24 04 3.06	2520 mas	-4059.6 mas	5.884914	-0.392773			74	G5.89-0.39			7.93	1.15
	+18 00 30.528	-24 04 2.55	3420 mas	-3549.6 mas	5.885150	-0.392901			75	G5.89-0.39			8.63	1.6
	+18 00 30.523	-24 04 2.64	3345 mas	-3639.6 mas	5.885119	-0.392897			76	G5.89-0.39			9.33	2.93
	+18 00 30.631	-24 04 2.1	4965 mas	-3099.6 mas	5.885453	-0.393179			77	G5.89-0.39			10.38	8.06
	+18 00 30.488	-24 04 2.85	2820 mas	-3849.6 mas	5.885002	-0.392811			78	G5.89-0.39			11.09	1.92
	+18 00 30.453	-24 04 2.19	2295 mas	-3189.6 mas	5.885095	-0.392604			79	G5.89-0.39			11.79	1.46
	+18 00 30.425	-24 04 3.11	1875 mas	-4109.6 mas	5.884820	-0.392638			80	G5.89-0.39			12.49	2.32
	+18 00 30.359	-24 04 3.82	885 mas	-4819.6 mas	5.884524	-0.392518			81	G5.89-0.39			14.6	8.08
	+18 00 30.345	-24 04 0.12	675 mas	-1119.6 mas	5.885390	-0.391962			82	G5.89-0.39			-41.94	7.09
	+18 00 30.35	-24 04 0.26	750 mas	-1259.6 mas	5.885366	-0.391998			83	G5.89-0.39			-40.89	6.08
	+18 00 30.486	-24 04 0.75	2790 mas	-1749.6 mas	5.885505	-0.392514			84	G5.89-0.39			-33.51	3.71
	+18 00 30.429	-24 04 1.02	1935 mas	-2019.6 mas	5.885332	-0.392363			85	G5.89-0.39			-31.41	6.28
	+18 00 30.395	-24 04 1.36	1425 mas	-2359.6 mas	5.885186	-0.392298			86	G5.89-0.39			-29.3	13.09
	+18 00 30.429	-24 04 1.68	1935 mas	-2679.6 mas	5.885173	-0.392454			87	G5.89-0.39			-26.14	17.44
	+18 00 30.42	-24 04 2.02	1800 mas	-3019.6 mas	5.885074	-0.392472			88	G5.89-0.39			-22.98	6.08
	+18 00 30.393	-24 04 2.57	1395 mas	-3569.6 mas	5.884890	-0.392458			89	G5.89-0.39			-22.28	5.26
	+18 00 30.388	-24 04 2.75	1320 mas	-3749.6 mas	5.884837	-0.392467			90	G5.89-0.39			-21.22	8.02
	+18 00 30.395	-24 04 2.76	1425 mas	-3759.6 mas	5.884848	-0.392491			91	G5.89-0.39			-20.52	8.14
	+18 00 30.391	-24 04 2.97	1365 mas	-3969.6 mas	5.884790	-0.392507			92	G5.89-0.39			-19.12	16.15
	+18 00 30.59	-24 04 1.57	4350 mas	-2569.6 mas	5.885503	-0.392971			93	G5.89-0.39			-16.66	5.4
	+18 00 30.559	-24 04 1.58	3885 mas	-2579.6 mas	5.885442	-0.392870			94	G5.89-0.39			-15.25	3.18
	+18 00 30.537	-24 04 0.76	3555 mas	-1759.6 mas	5.885598	-0.392684			95	G5.89-0.39			-14.2	1.14
	+18 00 30.566	-24 04 1.25	3990 mas	-2249.6 mas	5.885535	-0.392848			96	G5.89-0.39			-11.74	1.43
	+18 00 30.285	-24 04 2.63	-225 mas	-3629.6 mas	5.884672	-0.392110			97	G5.89-0.39			-1.21	0.74
	+18 00 30.342	-24 04 4.64	630 mas	-5639.6 mas	5.884295	-0.392575			98	G5.89-0.39			-0.15	1.65
	+18 00 30.345	-24 04 4.05	675 mas	-5049.6 mas	5.884443	-0.392504			99	G5.89-0.39			0.9	1.04
	+18 00 30.402	-24 04 4.3	1530 mas	-5299.6 mas	5.884490	-0.392726			100	G5.89-0.39			4.77	2.35
	+18 00 30.399	-24 04 4.11	1485 mas	-5109.6 mas	5.884530	-0.392690			101	G5.89-0.39			6.17	2.08
	+18 00 30.618	-24 04 2.1	4770 mas	-3099.6 mas	5.885428	-0.393137			102	G5.89-0.39			9.68	11.9
	+18 00 30.386	-24 04 3.83	1290 mas	-4829.6 mas	5.884573	-0.392609			103	G5.89-0.39			11.09	1.49
	+18 00 30.377	-24 04 3.63	1155 mas	-4629.6 mas	5.884604	-0.392552			104	G5.89-0.39			13.54	7.16
	+18 00 30.367	-24 04 3.87	1005 mas	-4869.6 mas	5.884527	-0.392552			105	G5.89-0.39			14.25	10.12
	+18 00 30.536	-24 04 4.65	3540 mas	-5649.6 mas	5.884659	-0.393217			106	G5.89-0.39			-15.08	0.6
	+18 00 30.57	-24 04 1.71	4050 mas	-2709.6 mas	5.885432	-0.392924			107	G5.89-0.39			-16.45	0.6
4	+18 04 53.8	-24 26 41			6.049876	-1.449075	G6.049-1.447	G6.0490-1.4471		G6.05-1.45	M8E; NGC6530; Mol 37	Image	10.8	0.19 .. 12.2	NRAOVLA	C	0.34	20.000	27.43 x 13.58	12.13	+H₂O +CH₃OH I -CH₃OH II +OH	SFR		2013 July - August
	+18 04 53.148	-24 26 41.8	-9781.2 mas	-800.8 mas	6.048471	-1.447027			1	G6.05-1.45			10.99	12.2
	+18 04 53.149	-24 26 41.9	-9766.2 mas	-900.8 mas	6.048449	-1.447044			2	G6.05-1.45			11.34	5.87
	+18 04 53.147	-24 26 42.58	-9796.2 mas	-1580.8 mas	6.048280	-1.447130			3	G6.05-1.45			11.27	0.88
	+18 04 53.043	-24 26 42.81	-11356.2 mas	-1810.8 mas	6.048031	-1.446817			4	G6.05-1.45			11.27	0.19
5	+18 06 19.2	-21 37 38			8.668209	-0.357405	G8.669-0.356	G8.6691-0.3560		G8.67-0.36		Image	35.7	0.53 .. 3.76	NRAOVLA	C	0.34	20.000	26.31 x 13.78	16.76	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2013 July - August
	+18 06 18.886	-21 37 32.48	-4710 mas	5519.2 mas	8.668954	-0.355595			1	G8.67-0.36			38.03	0.56
	+18 06 18.869	-21 37 32.53	-4965 mas	5469.2 mas	8.668910	-0.355544			2	G8.67-0.36			38.03	0.53
	+18 06 18.978	-21 37 33.88	-3330 mas	4119.2 mas	8.668789	-0.356096			3	G8.67-0.36			37.53	0.55
	+18 06 19.028	-21 37 33.01	-2580 mas	4989.2 mas	8.669094	-0.356147			4	G8.67-0.36			38.93	0.94
	+18 06 19.039	-21 37 32.89	-2415 mas	5109.2 mas	8.669144	-0.356168			5	G8.67-0.36			39.64	2.14
	+18 06 19.036	-21 37 33.67	-2460 mas	4329.2 mas	8.668949	-0.356263			6	G8.67-0.36			38.93	0.91
	+18 06 19.011	-21 37 32.9	-2835 mas	5099.2 mas	8.669089	-0.356074			7	G8.67-0.36			39.99	1.26
	+18 06 18.999	-21 37 32.88	-3015 mas	5119.2 mas	8.669071	-0.356031			8	G8.67-0.36			41.04	1.51
	+18 06 19.027	-21 37 32.83	-2595 mas	5169.2 mas	8.669136	-0.356119			9	G8.67-0.36			39.37	3.36
	+18 06 19.025	-21 37 32.5	-2625 mas	5499.2 mas	8.669212	-0.356067			10	G8.67-0.36			39.71	3.76
6	+18 17 57	-12 07 22			18.33988	1.772555	G18.340+1.772	G18.3401+1.7722		G18.34+1.772	Mol 46		32.2	..	NRAOVLA	C	0.34	20.000	22.94 x 17.6	65.33	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2013 July - August
7	+18 27 38	-11 56 40			19.60837	-0.234646	G19.609-0.234	G19.6092-0.2346		G19.61-0.23		Image	41.4	0.2 .. 8.39	NRAOVLA	C	0.34	20.000	21.41

Display data from paper

BAY21 - Search for Collisionally Pumped 1720 MHz OH Masers in Star-forming Regions: A VLA Survey of 18 cm OH Masers toward 80 Class I Methanol Masers

Interferometry data

View as list of objects

Detection table from Bayandina et al. (2021)