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CAS04 - OH 1720-MHz masers in southern star-forming regions

Short title: Caswell (2004)
Authors: Caswell, J. L.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 349, Issue 1, pp. 99-114.
Bibcode:
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Target type: OH
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1612,OH_1665,OH_1720,OH_6035

Abstract
A search for maser emission at the 1720-MHz transition of OH has been made with the Australia Telescope Compact Array (ATCA) towards more than 200 southern sites of 1665- and 6035-MHz OH masers. 28 of the 36 detected 1720-MHz masers precisely coincide with the targets (15 previously known; 13 new discoveries) and are thus almost certainly of the star formation region (SFR) variety. Our observations revealed highly variable intensities for some previously known 1720-MHz masers, in extreme cases now preventing their detection. We interpret six new masers serendipitously discovered offset from any target position as an SFR subclass. Two other masers were chance detections of a quite different maser class associated with supernova remnants. Several instances of prominent 1720-MHz OH absorption occur. The 1720-MHz masers mostly coincide, to arcsecond accuracy, with a stronger 1665-MHz OH maser counterpart; in a few instances, 1665-MHz counterparts are much weaker, and the six 1720-MHz masers discovered offset from any target position (with no detectable 1665-MHz emission) are the ultimate examples, qualifying them as a distinct SFR subclass. At the sensitivity of the current survey, we find that SFR 1720-MHz masers are approximately one-sixth as common as 1665-MHz masers. The 1720-MHz masers preferentially occur at the sites hosting 6035-MHz masers - explicable in the context of current maser pumping models if 1720-MHz and 6035-MHz masers trace regions where the OH column density is higher, and the kinetic temperature lower, than at sites displaying only 1665-MHz masers. For each 1720-MHz maser, spectra of the two circular polarizations at high-velocity resolution were taken with the Parkes telescope. Similar observations, to monitor several previously known northern 1720-MHz masers, augment the southern sample. The Parkes spectra commonly reveal Zeeman splitting in magnetic fields of a few milligauss, and the largest field is a `record-setting' 16 mG. Compared with fields derived from other OH transitions at the same site, the 1720-MHz values generally imply the same direction of field, but the field strength tends to be higher, by as much as a factor of 2. This may be understood if the 1720-MHz masers preferentially occur at locations compressed to higher density, with enhanced frozen-in magnetic field. Such higher fields support a pumping scheme requiring high densities for the 1720-MHz masers. Towards most of the 1720-MHz maser sites lies an associated 6668-MHz methanol maser, consistent with pumping expectations that the methanol masers are also favoured by high densities. We also explore some sites in more detail, with new results obtained in the radio continuum and recombination lines, and at other masing transitions - a new position for 328.809+0.633 at the 1612-MHz OH transition, for example, confirms a rare spatial near-coincidence with a 1720-MHz maser (although offset in velocity).

Abstract

A search for maser emission at the 1720-MHz transition of OH has been made with the Australia Telescope Compact Array (ATCA) towards more than 200 southern sites of 1665- and 6035-MHz OH masers. 28 of the 36 detected 1720-MHz masers precisely coincide with the targets (15 previously known; 13 new discoveries) and are thus almost certainly of the star formation region (SFR) variety. Our observations revealed highly variable intensities for some previously known 1720-MHz masers, in extreme cases now preventing their detection. We interpret six new masers serendipitously discovered offset from any target position as an SFR subclass. Two other masers were chance detections of a quite different maser class associated with supernova remnants. Several instances of prominent 1720-MHz OH absorption occur.

The 1720-MHz masers mostly coincide, to arcsecond accuracy, with a stronger 1665-MHz OH maser counterpart; in a few instances, 1665-MHz counterparts are much weaker, and the six 1720-MHz masers discovered offset from any target position (with no detectable 1665-MHz emission) are the ultimate examples, qualifying them as a distinct SFR subclass. At the sensitivity of the current survey, we find that SFR 1720-MHz masers are approximately one-sixth as common as 1665-MHz masers. The 1720-MHz masers preferentially occur at the sites hosting 6035-MHz masers - explicable in the context of current maser pumping models if 1720-MHz and 6035-MHz masers trace regions where the OH column density is higher, and the kinetic temperature lower, than at sites displaying only 1665-MHz masers.

For each 1720-MHz maser, spectra of the two circular polarizations at high-velocity resolution were taken with the Parkes telescope. Similar observations, to monitor several previously known northern 1720-MHz masers, augment the southern sample. The Parkes spectra commonly reveal Zeeman splitting in magnetic fields of a few milligauss, and the largest field is a `record-setting' 16 mG. Compared with fields derived from other OH transitions at the same site, the 1720-MHz values generally imply the same direction of field, but the field strength tends to be higher, by as much as a factor of 2. This may be understood if the 1720-MHz masers preferentially occur at locations compressed to higher density, with enhanced frozen-in magnetic field. Such higher fields support a pumping scheme requiring high densities for the 1720-MHz masers.

Towards most of the 1720-MHz maser sites lies an associated 6668-MHz methanol maser, consistent with pumping expectations that the methanol masers are also favoured by high densities. We also explore some sites in more detail, with new results obtained in the radio continuum and recombination lines, and at other masing transitions - a new position for 328.809+0.633 at the 1612-MHz OH transition, for example, confirms a rare spatial near-coincidence with a 1720-MHz maser (although offset in velocity).

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Descr.	Line	Frequency	V_peak	F_peak	Telescope	V_step	RMS	Beam	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					OH	(MHz)	(km/s)	(Jy)		(km/s)	(Jy)	(arcsec)	Yes/No		(kpc)	(kpc)
1	11 12 19.5	-58 46 4.9	290.3755	1.6663	G290.374+1.661	*290.375+1.666	Image	Descr	1720 MHz;	1720	-20.5	0.6	ATCA	0.7	0.040	7	+H₂O +CH₃OH II +OH	SFR	0.200		01de
	11 12 19.5	-58 46 4.9	290.3755	1.6663	G290.374+1.661	*290.375+1.666			1720 MHz;	1720	-20.5	0.6	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	0.200		01de
3	12 34 53.6	-61 39 40	300.9695	1.1476	G300.969+1.148	300.969+1.147	Image	Descr	1720 MHz;	1720	-42.2	0.35 (0.35)	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			01au;02ap
4	13 21 23.1	-63 00 29.3	306.3222	-0.3337	G306.322-0.334	306.322-0.334	Image	Descr	1720 MHz;	1720	-22.6	1.8 (3.1)	ATCA	0.7	0.040	7	+H₂O +CH₃OH II +OH	SFR	0.140		97no;01au;02ap
	13 21 23.1	-63 00 29.3	306.3222	-0.3337	G306.322-0.334	306.322-0.334			1720 MHz;	1720	-22.6	4	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	0.140		97no;01au;02ap
6	13 21 23.1	-63 00 29.3	306.3222	-0.3337	G306.322-0.334	306.322-0.334			6035 MHz;	6035	-22.6	0.14	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	0.140		97no;01au;02ap
	13 21 23.1	-63 00 29.3	306.3222	-0.3337	G306.322-0.334	306.322-0.334			6035 MHz;	6035	-22.6	0.14	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	0.140		97no;01au;02ap
8	13 51 59.6	-61 15 39.6	310.1463	0.7597	G310.144+0.760	*310.146+0.760	Image	Descr	1720 MHz;	1720	-55	1.2	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.200		02ap
	13 51 59.6	-61 15 39.6	310.1463	0.7597	G310.144+0.760	*310.146+0.760			1720 MHz;	1720	-55	0.8	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.200		02ap
10	15 29 19.2	-56 31 22	323.4588	-0.0785	G323.459-0.079	323.459-0.079	Image	Descr	1720 MHz;	1720	-68.5	0.35	ATCA	0.7	0.040	7	-H₂O +CH₃OH II +OH	SFR	13.800		97no
	15 29 19.2	-56 31 22	323.4588	-0.0785	G323.459-0.079	323.459-0.079			1720 MHz;	1720	-68.5	1.1	ATCA	0.7		7	-H₂O +CH₃OH II +OH	SFR	13.800		97no
12	15 29 19.2	-56 31 22	323.4588	-0.0785	G323.459-0.079	323.459-0.079			6035 MHz;	6035	-68.5	13.8	ATCA	0.7		7	-H₂O +CH₃OH II +OH	SFR	13.800		97no
	15 29 19.2	-56 31 22	323.4588	-0.0785	G323.459-0.079	323.459-0.079			6035 MHz;	6035	-68.5	13.8	ATCA	0.7		7	-H₂O +CH₃OH II +OH	SFR	13.800		97no
14	15 55 48.5	-52 43 5.9	328.8085	0.6331	G328.809+0.633	328.809+0.633	Image	Descr	1720 MHz;	1720	-43.2	10	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	10.100		97no
	15 55 48.5	-52 43 5.9	328.8085	0.6331	G328.809+0.633	328.809+0.633			1720 MHz;	1720	-43.2	18.8	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	10.100		97no
16	15 55 48.5	-52 43 5.9	328.8085	0.6331	G328.809+0.633	328.809+0.633			6035 MHz;	6035	-43.2	10.1	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	10.100		97no
	15 55 48.5	-52 43 5.9	328.8085	0.6331	G328.809+0.633	328.809+0.633			6035 MHz;	6035	-43.2	10.1	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	10.100		97no
18	16 00 33.1	-52 44 40.3	329.3388	0.1480	G329.339+0.148	329.339+0.148	Image	Descr	1720 MHz;	1720	-106.9	0.9 (0.9)	ATCA	0.7	0.040	7	-H₂O -CH₃OH I +CH₃OH II +OH	SFR_MIXED			00no
19	16 02 19	-52 55 07	329.4257	-0.1582	G329.426-0.161	*329.426-0.158	Image	Descr	1720 MHz;	1720	-79	2.5 (3.5)	ATCA	0.7	0.040	7	+H₂O -CH₃OH II +OH	SFR_MIXED			00no; 01mar
20	16 09 52	-51 54 51.7	330.9532	-0.1804	G330.953-0.182	330.953-0.182	Image	Descr	1720 MHz;	1720	-86	0.8	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH		1.060		01au
	16 09 52	-51 54 51.7	330.9532	-0.1804	G330.953-0.182	330.953-0.182			1720 MHz;	1720	-86	0.7	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH		1.060		01au
22	16 09 52	-51 54 51.7	330.9532	-0.1804	G330.953-0.182	330.953-0.182			6035 MHz;	6035	-86	1.06	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH		1.060		01au
	16 09 52	-51 54 51.7	330.9532	-0.1804	G330.953-0.182	330.953-0.182			6035 MHz;	6035	-86	1.06	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH		1.060		01au
24	16 34 38.4	-47 36 33.4	336.8223	0.0276	G336.822+0.028	336.822+0.028	Image	Descr	1720 MHz;	1720	-76	0.14	ATCA	0.7	0.040	7	-H₂O +CH₃OH II +OH	SFR			02se
	16 34 38.4	-47 36 33.4	336.8223	0.0276	G336.822+0.028	336.822+0.028			1720 MHz;	1720	-76	0.2	ATCA	0.7		7	-H₂O +CH₃OH II +OH	SFR			02se
26	16 35 55.1	-47 38 45.3	336.9409	-0.1561	G336.941-0.156	336.941-0.156	Image	Descr	1720 MHz;	1720	-69	0.6	ATCA	0.7	0.040	7	-H₂O +CH₃OH II +OH	SFR	1.500		01au
	16 35 55.1	-47 38 45.3	336.9409	-0.1561	G336.941-0.156	336.941-0.156			1720 MHz;	1720	-69	1	ATCA	0.7		7	-H₂O +CH₃OH II +OH	SFR	1.500		01au
28	16 35 55.1	-47 38 45.3	336.9409	-0.1561	G336.941-0.156	336.941-0.156			6035 MHz;	6035	-69	1.5	ATCA	0.7		7	-H₂O +CH₃OH II +OH	SFR	1.500		01au
	16 35 55.1	-47 38 45.3	336.9409	-0.1561	G336.941-0.156	336.941-0.156			6035 MHz;	6035	-69	1.5	ATCA	0.7		7	-H₂O +CH₃OH II +OH	SFR	1.500		01au
30	16 35 33.9	-47 31 11	336.9938	-0.0269	G336.994-0.027	336.994-0.027	Image	Descr	1720 MHz;	1720	-126	0.3	ATCA	0.7	0.040	7	+H₂O +CH₃OH II +OH	SFR	0.150		01au
	16 35 33.9	-47 31 11	336.9938	-0.0269	G336.994-0.027	336.994-0.027			1720 MHz;	1720	-126	0.2	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	0.150		01au
32	16 38 9.5	-47 04 59.5	337.6125	-0.0596	G337.613-0.060	337.613-0.060	Image	Descr	1720 MHz;	1720	-40.5	0.44	ATCA	0.7	0.040	7	+H₂O +CH₃OH II +OH	SFR	1.150		97no
	16 38 9.5	-47 04 59.5	337.6125	-0.0596	G337.613-0.060	337.613-0.060			1720 MHz;	1720	-40.5	0.8	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	1.150		97no
34	16 38 9.5	-47 04 59.5	337.6125	-0.0596	G337.613-0.060	337.613-0.060			6035 MHz;	6035	-40.5	1.15	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	1.150		97no
	16 38 9.5	-47 04 59.5	337.6125	-0.0596	G337.613-0.060	337.613-0.060			6035 MHz;	6035	-40.5	1.15	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	1.150		97no
36	16 38 52.1	-46 56 16.1	337.8017	-0.0527	G337.802-0.053	[sn337.802-0.053]	Image	Descr	1720 MHz;	1720	-45	1.5	ATCA	0.7	0.040	7	+OH	SFR			97no
	16 38 52.1	-46 56 16.1	337.8017	-0.0527	G337.802-0.053	[sn337.802-0.053]			1720 MHz;	1720	-45	1	ATCA	0.7		7	+OH	SFR			97no
38	16 39 39.2	-46 41 27.2	338.0752	0.0117	G338.075+0.012	338.075+0.012	Image	Descr	1720 MHz;	1720	-53	0.35 (0.16)	ATCA	0.7	0.040	7	+H₂O +CH₃OH II +OH	SFR_MIXED			02ap
39	16 40 33.6	-45 41 37.2	338.9251	0.5564	G338.925+0.556	338.925+0.557	Image	Descr	1720 MHz;	1720	-61	0.8; 0.15	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH		0.280		97no; 02ap
40	16 46 06	-45 36 43.9	339.6220	-0.1207	G339.622-0.121	339.622-0.121	Image	Descr	1720 MHz;	1720	-37.3	0.4	ATCA	0.7	0.040	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR			97ap
	16 46 06	-45 36 43.9	339.6220	-0.1207	G339.622-0.121	339.622-0.121			1720 MHz;	1720	-37.3	1.6	ATCA	0.7		7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR			97ap
42	16 52 4.6	-46 08 34.1	339.8839	-1.2586	G339.884-1.259	339.884-1.259	Image	Descr	1720 MHz;	1720	-34.8	1.9 (3.3)	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			00no; 01mar
43	16 50 14.8	-44 42 26.8	340.7849	-0.0960	G340.785-0.096	340.785-0.096	Image	Descr	1720 MHz;	1720	-101	1.2	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	3.100		97no
	16 50 14.8	-44 42 26.8	340.7849	-0.0960	G340.785-0.096	340.785-0.096			1720 MHz;	1720	-101	3.3	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	3.100		97no
45	16 50 14.8	-44 42 26.8	340.7849	-0.0960	G340.785-0.096	340.785-0.096			6035 MHz;	6035	-101	3.1	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	3.100		97no
	16 50 14.8	-44 42 26.8	340.7849	-0.0960	G340.785-0.096	340.785-0.096			6035 MHz;	6035	-101	3.1	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	3.100		97no
47	17 05 11.2	-41 29 7.5	345.0033	-0.2246	G345.003-0.224	*345.003-0.224	Image	Descr	1720 MHz;	1720	-27	20	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.400		85ja(GM87)
	17 05 11.2	-41 29 7.5	345.0033	-0.2246	G345.003-0.224	*345.003-0.224			1720 MHz;	1720	-27	48	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.400		85ja(GM87)
49	17 05 11.2	-41 29 7.5	345.0033	-0.2246	G345.003-0.224	*345.003-0.224			6035 MHz;	6035	-27	2.4	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.400		85ja(GM87)
	17 05 11.2	-41 29 7.5	345.0033	-0.2246	G345.003-0.224	*345.003-0.224			6035 MHz;	6035	-27	2.4	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.400		85ja(GM87)
51	16 57 58	-40 16 49.9	345.1176	1.5924	G345.118+1.592	*345.118+1.592	Image	Descr	1720 MHz;	1720	-17	6.2	ATCA	0.7	0.040	7	-CH₃OH II +OH	SFR	0.100		02ap
	16 57 58	-40 16 49.9	345.1176	1.5924	G345.118+1.592	*345.118+1.592			1720 MHz;	1720	-17	4.2	ATCA	0.7		7	-CH₃OH II +OH	SFR	0.100		02ap
53	16 59 43.7	-40 03 54.2	345.4954	1.4617	G345.495+1.467	*345.495+1.462	Image	Descr	1720 MHz;	1720	-24.5	2.3	ATCA	0.7	0.040	7	+H₂O +CH₃OH II +OH	SFR	0.200		01au
	16 59 43.7	-40 03 54.2	345.4954	1.4617	G345.495+1.467	*345.495+1.462			1720 MHz;	1720	-24.5	2.5	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	0.200		01au
55	16 59 44.1	-40 03 51.9	345.4967	1.4611	G345.495+1.467	*345.497+1.462		Descr	1720 MHz;	1720	-20.5	4.9	ATCA	0.7	0.040	7	+H₂O +CH₃OH II +OH	SFR	0.200		01au
	16 59 44.1	-40 03 51.9	345.4967	1.4611	G345.495+1.467	*345.497+1.462			1720 MHz;	1720	-20.5	4.6	ATCA	0.7		7	+H₂O +CH₃OH II +OH	SFR	0.200		01au
57	17 19 20.4	-39 03 51.5	348.5498	-0.9788	G348.550-0.979	348.550-0.979	Image	Descr	1720 MHz;	1720	-19.7	2.6	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.500		02ap
	17 19 20.4	-39 03 51.5	348.5498	-0.9788	G348.550-0.979	348.550-0.979			1720 MHz;	1720	-19.7	4.7	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.500		02ap
59	17 19 20.4	-39 03 51.5	348.5498	-0.9788	G348.550-0.979	348.550-0.979			6035 MHz;	6035	-19.7	0.5	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.500		02ap
	17 19 20.4	-39 03 51.5	348.5498	-0.9788	G348.550-0.979	348.550-0.979			6035 MHz;	6035	-19.7	0.5	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.500		02ap
61	17 23 28.6	-37 01 48.5	350.6860	-0.4908	G350.686-0.491	350.686-0.491	Image	Descr	1720 MHz;	1720	-15	0.6	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.900		02au
	17 23 28.6	-37 01 48.5	350.6860	-0.4908	G350.686-0.491	350.686-0.491			1720 MHz;	1720	-15	1.2	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.900		02au
63	17 23 28.6	-37 01 48.5	350.6860	-0.4908	G350.686-0.491	350.686-0.491			6035 MHz;	6035	-15	0.9	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.900		02au
	17 23 28.6	-37 01 48.5	350.6860	-0.4908	G350.686-0.491	350.686-0.491			6035 MHz;	6035	-15	0.9	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.900		02au
65	17 20 53.4	-35 47 02	351.4167	0.6451	G351.417+0.645	351.417+0.645	Image	Descr	1720 MHz;	1720	-10.2	22 (70.1)	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	0.160		85ja(GM87); 01au
	17 20 53.4	-35 47 02	351.4167	0.6451	G351.417+0.645	351.417+0.645			1720 MHz;	1720	-10.2	86	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	0.160		85ja(GM87); 01au
67	17 20 53.4	-35 47 02	351.4167	0.6451	G351.417+0.645	351.417+0.645			6035 MHz;	6035	-10.2	160	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	0.160		85ja(GM87); 01au
	17 20 53.4	-35 47 02	351.4167	0.6451	G351.417+0.645	351.417+0.645			6035 MHz;	6035	-10.2	160	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	0.160		85ja(GM87); 01au
69	17 25 25.3	-36 12 45.1	351.5814	-0.3532	G351.581-0.353	[351.581-0.353]		Descr	1720 MHz;	1720	-97.6	0.2; 0.15	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			97no; 01au
	17 25 25.3	-36 12 45.1	351.5814	-0.3532	G351.581-0.353	[351.581-0.353]			1720 MHz;	1720	-97.6	0.6	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			97no; 01au
71	17 26 42.4	-36 09 20	351.7738	-0.5365	G351.775-0.536	351.775-0.536	Image	Descr	1720 MHz;	1720	-2	2.9 (6.2)	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1.900		97no; 01au
	17 26 42.4	-36 09 20	351.7738	-0.5365	G351.775-0.536	351.775-0.536			1720 MHz;	1720	-2	7.7	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1.900		97no; 01au
73	17 26 42.4	-36 09 20	351.7738	-0.5365	G351.775-0.536	351.775-0.536			6035 MHz;	6035	-2	1.9	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1.900		97no; 01au
	17 26 42.4	-36 09 20	351.7738	-0.5365	G351.775-0.536	351.775-0.536			6035 MHz;	6035	-2	1.9	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1.900		97no; 01au
75	17 30 26.2	-34 41 45.7	353.4098	-0.3602	G353.410-0.360	353.410-0.360	Image	Descr	1720 MHz;	1720	-19.7	11	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	16.000		85ja(GM87)
	17 30 26.2	-34 41 45.7	353.4098	-0.3602	G353.410-0.360	353.410-0.360			1720 MHz;	1720	-19.7	18	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	16.000		85ja(GM87)
77	17 30 26.2	-34 41 45.7	353.4098	-0.3602	G353.410-0.360	353.410-0.360			6035 MHz;	6035	-19.7	16	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	16.000		85ja(GM87)
	17 30 26.2	-34 41 45.7	353.4098	-0.3602	G353.410-0.360	353.410-0.360			6035 MHz;	6035	-19.7	16	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	16.000		85ja(GM87)
79	17 47 20.1	-28 23 10.5	0.6653	-0.0358	G0.6665-0.0344	0.666-0.035	Image	Descr	1720 MHz;	1720	61.2	2	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH		1.100		02ap
	17 47 20.1	-28 23 10.5	0.6653	-0.0358	G0.6665-0.0344	0.666-0.035			1720 MHz;	1720	61.2	3	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH		1.100		02ap
81	17 47 20.1	-28 23 10.5	0.6653	-0.0358	G0.6665-0.0344	0.666-0.035			6035 MHz;	6035	61.2	1.1	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH		1.100		02ap
	17 47 20.1	-28 23 10.5	0.6653	-0.0358	G0.6665-0.0344	0.666-0.035			6035 MHz;	6035	61.2	1.1	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH		1.100		02ap
83	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392	Image	Descr	1720 MHz;	1720	-13.9	0.17	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY	0.170		02se
	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392	Image	Descr	1720 MHz;	1720	-13.9	0.17	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.170		02se
	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392			1720 MHz;	1720	-13.9	0.26	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY	0.170		02se
	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392			1720 MHz;	1720	-13.9	0.26	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.170		02se
87	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392			6035 MHz;	6035	-13.9	0.17	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY	0.170		02se
	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392			6035 MHz;	6035	-13.9	0.17	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.170		02se
	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392			6035 MHz;	6035	-13.9	0.17	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY	0.170		02se
	18 00 30.6	-24 04 0.9	5.8856	-0.3928	G5.885-0.392	5.885-0.392			6035 MHz;	6035	-13.9	0.17	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.170		02se
91	18 01 52.7	-23 19 25.6	6.6863	-0.2968	G6.691-0.291	[sn6.686-0.297]	Image	Descr	1720 MHz;	1720	11.5	64	ATCA	0.7	0.040	7	+CH₃OH I +OH	SFR			01de
	18 01 52.7	-23 19 25.6	6.6863	-0.2968	G6.691-0.291	[sn6.686-0.297]			1720 MHz;	1720	11.5	85	ATCA	0.7		7	+CH₃OH I +OH	SFR			01de
93	18 06 19	-21 37 33.1	8.6690	-0.3560	G8.669-0.356	8.669-0.356	Image	Descr	1720 MHz;	1720	39.2	1	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			01de
	18 06 19	-21 37 33.1	8.6690	-0.3560	G8.669-0.356	8.669-0.356			1720 MHz;	1720	39.2	1.5	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			01de
95	18 08 38.3	-19 51 47.9	10.4730	0.0272	G10.472+0.027	10.473+0.027	Image	Descr	1720 MHz;	1720	51.5	0.4	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	0.200		97no
	18 08 38.3	-19 51 47.9	10.4730	0.0272	G10.472+0.027	10.473+0.027			1720 MHz;	1720	51.5	0.85	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	0.200		97no
97	18 09 39.8	-19 21 23.6	11.0332	0.0616	G11.034+0.062	11.034+0.062	Image	Descr	1720 MHz;	1720	21.7	0.45	ATCA	0.7	0.040	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	0.850		97no
	18 09 39.8	-19 21 23.6	11.0332	0.0616	G11.034+0.062	11.034+0.062			1720 MHz;	1720	21.7	0.9	ATCA	0.7		7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	0.850		97no
99	18 09 39.8	-19 21 23.6	11.0332	0.0616	G11.034+0.062	11.034+0.062			6035 MHz;	6035	21.7	0.85	ATCA	0.7		7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	0.850		97no
	18 09 39.8	-19 21 23.6	11.0332	0.0616	G11.034+0.062	11.034+0.062			6035 MHz;	6035	21.7	0.85	ATCA	0.7		7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	0.850		97no
101	18 12 3.6	-18 31 53	12.0294	-0.0371	G12.026-0.032	[12.03-0.04]		Descr	1720 MHz;	1720	114.5	0.4; 0.2	ATCA	0.7	0.040	7	-H₂O -CH₃OH I +CH₃OH II -OH		0.150		97no;01au
102	18 13 54.8	-18 01 47.9	12.6804	-0.1826	G12.681-0.182	12.680-0.183	Image	Descr	1720 MHz;	1720	63	0.2	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			01au
	18 13 54.8	-18 01 47.9	12.6804	-0.1826	G12.681-0.182	12.680-0.183			1720 MHz;	1720	63	0.1	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			01au
104	18 14 39.4	-17 52 2.8	12.9077	-0.2603	G12.908-0.260	12.908-0.260	Image	Descr	1720 MHz;	1720	32.5	1.2	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			01au
	18 14 39.4	-17 52 2.8	12.9077	-0.2603	G12.908-0.260	12.908-0.260			1720 MHz;	1720	32.5	0.6	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			01au
106	18 22 26.1	-13 30 08	17.6388	0.1579	G17.638+0.157	17.639+0.158	Image	Descr	1720 MHz;	1720	28.5	0.15 (0.3)	ATCA	0.7	0.040	7	+H₂O -CH₃OH I +CH₃OH II +OH -SiO	SFR	0.250		01au;02se; 03mar
	18 22 26.1	-13 30 08	17.6388	0.1579	G17.638+0.157	17.639+0.158			1720 MHz;	1720	28.5	0.45	ATCA	0.7		7	+H₂O -CH₃OH I +CH₃OH II +OH -SiO	SFR	0.250		01au;02se; 03mar
108	18 27 44.6	-11 14 56	20.2365	0.0652	G20.237+0.067	20.237+0.065	Image	Descr	1720 MHz;	1720	75	0.4 (0.25)	ATCA	0.7	0.040	7	+H₂O -CH₃OH I +CH₃OH II +OH				01au
109	19 10 21.7	+09 05 2.4	43.1648	-0.0280	G43.166+0.011	43.165-0.028	Image	Descr	1720 MHz;	1720	15	73.7	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.600		85ja(GM87)
	19 10 21.7	+09 05 2.4	43.1648	-0.0280	G43.166+0.011	43.165-0.028			1720 MHz;	1720	15	220	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.600		85ja(GM87)
111	19 10 21.7	+09 05 2.4	43.1648	-0.0280	G43.166+0.011	43.165-0.028			6035 MHz;	6035	15	0.6	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.600		85ja(GM87)
	19 10 21.7	+09 05 2.4	43.1648	-0.0280	G43.166+0.011	43.165-0.028			6035 MHz;	6035	15	0.6	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.600		85ja(GM87)
113	19 23 43.9	+14 30 34.3	49.4897	-0.3875	G49.489-0.386	49.490-0.387	Image	Descr	1720 MHz;	1720	58.1	88	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.200		85ja(GM87)
	19 23 43.9	+14 30 34.3	49.4897	-0.3875	G49.489-0.386	49.490-0.387			1720 MHz;	1720	58.1	86	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.200		85ja(GM87)
115	19 23 43.9	+14 30 34.3	49.4897	-0.3875	G49.489-0.386	49.490-0.387			6035 MHz;	6035	58.1	4.2	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.200		85ja(GM87)
	19 23 43.9	+14 30 34.3	49.4897	-0.3875	G49.489-0.386	49.490-0.387			6035 MHz;	6035	58.1	4.2	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.200		85ja(GM87)
117	19 23 43.8	+14 30 28.3	49.4881	-0.3880	G49.489-0.386	49.488-0.388	Image	Descr	1720 MHz;	1720	53.5	2.6	ATCA	0.7	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			85ja(GM87)
	19 23 43.8	+14 30 28.3	49.4881	-0.3880	G49.489-0.386	49.488-0.388			1720 MHz;	1720	53.5	2.2	ATCA	0.7		7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			85ja(GM87)

Non-detection table from Caswell (2004)