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OGB20 - MAGMO: polarimetry of 1720-MHz OH masers towards southern star-forming regions

Short title: Ogbodo et al. (2020)
Authors: Ogbodo, C. S.Green, J. A.Dawson, J. R.Breen, S. L.Mao, S. A.McClure-Griffiths, N. M.Robishaw, T.Harvey-Smith, L.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 1, p.199-233
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Target type: High_mass_SFR
Observations category: polarization
Facility type: interferometer
Transitions: OH_1720

Abstract
From targeted observations of ground-state hydroxyl (OH) masers towards 702 Methanol Multibeam survey 6.7-GHz methanol masers, in the Galactic longitude range from 186� through the Galactic Centre to 20�, made as part of the `MAGMO' (Mapping the Galactic Magnetic field through OH masers) project, we present the physical and polarization properties of the 1720-MHz OH maser transition, including the identification of Zeeman pairs. We present 10 new and 23 previously catalogued 1720-MHz OH maser sources detected towards star-forming regions (SFRs). In addition, we also detected 16 1720-MHz OH masers associated with supernova remnants and two sites of diffuse OH emission. Towards the 33 star formation masers, we identify 44 Zeeman pairs, implying magnetic field strengths ranging from -11.4 to +13.2 mG, and a median magnetic field strength of B_LOS âˆ¼ 6 mG. With limited statistics, we present the in situ magnetic field orientation of the masers and the Galactic magnetic field distribution revealed by the 1720-MHz transition. We also examine the association statistics of 1720-MHz OH SFR masers with other ground-state OH masers, excited-state OH masers, class I and class II methanol masers, and water masers, and compare maser positions with mid-infrared images of the parent SFRs. Of the 33 1720-MHz star formation masers, 10 are offset from their central exciting sources, and appear to be associated with outflow activity.

Abstract

From targeted observations of ground-state hydroxyl (OH) masers towards 702 Methanol Multibeam survey 6.7-GHz methanol masers, in the Galactic longitude range from 186� through the Galactic Centre to 20�, made as part of the `MAGMO' (Mapping the Galactic Magnetic field through OH masers) project, we present the physical and polarization properties of the 1720-MHz OH maser transition, including the identification of Zeeman pairs. We present 10 new and 23 previously catalogued 1720-MHz OH maser sources detected towards star-forming regions (SFRs). In addition, we also detected 16 1720-MHz OH masers associated with supernova remnants and two sites of diffuse OH emission. Towards the 33 star formation masers, we identify 44 Zeeman pairs, implying magnetic field strengths ranging from -11.4 to +13.2 mG, and a median magnetic field strength of B_LOS âˆ¼ 6 mG. With limited statistics, we present the in situ magnetic field orientation of the masers and the Galactic magnetic field distribution revealed by the 1720-MHz transition. We also examine the association statistics of 1720-MHz OH SFR masers with other ground-state OH masers, excited-state OH masers, class I and class II methanol masers, and water masers, and compare maser positions with mid-infrared images of the parent SFRs. Of the 33 1720-MHz star formation masers, 10 are offset from their central exciting sources, and appear to be associated with outflow activity.

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Detection table from Ogbodo et al. (2020)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Image	Descr.	Line	Frequency	V_range	V_peak	F_peak	Telescope	Configuration	RMS	Beam	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)						OH	(MHz)	(km/s)	(km/s)	(Jy)			(mJy)	(arcsec)	Yes/No		(kpc)	(kpc)
1	06 08 46.7	+21 31 44	189.0322	0.8090	G189.032+0.784	G189.0322+0.8091	189.032+0.809	Image	Descr	1720 MHz;	1720	3.0;4.0	3.5	1.34	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.000		2012 January
2	06 08 35.2	+20 39 14.2	189.7757	0.3456	G189.776+0.343	G189.7777+0.3449	189.776+0.346	Image	Descr	1720 MHz;	1720	10.5;14.0	12.4	1.47	ATCA	6B	40.000	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	2.000		2012 January
3	13 21 23	-63 00 29.5	306.3221	-0.3337	G306.322-0.334	G306.3221-0.3337	306.322-0.334	Image	Descr	1720 MHz;	1720	-20.5;-24.5	-23.4	2.04	ATCA	6B	40.000	7	+H₂O +CH₃OH II +OH	SFR_MIXED	1.500		2011 September
4	15 29 19.3	-56 31 22	323.4590	-0.0787	G323.459-0.079	G323.4591-0.0786	323.459-0.079	Image	Descr	1720 MHz;	1720	-68;-69	-68.3	1.78	ATCA	6B	40.000	7	-H₂O +CH₃OH II +OH	SFR	3.800		2012 January
5	15 52 42.6	-53 09 52.5	328.1644	0.5865	G328.164+0.587	G328.1644+0.5869	328.165+0.586	Image	Descr	1720 MHz;	1720	-85.5;-89	-87.9	0.45	ATCA	6B	40.000	7	+CH₃OH I +CH₃OH II +OH	SFR	5.500		2012 January
6	15 55 48.5	-52 43 6.2	328.8085	0.6330	G328.809+0.633	G328.8087+0.6330	328.808+0.633	Image	Descr	1720 MHz;	1720	-42.5;-43.7	-43.2	29.19	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.600		2011 December
7	16 00 33.1	-52 44 39.8	329.3389	0.1482	G329.339+0.148	G329.3389+0.1481	329.339+0.148	Image	Descr	1720 MHz;	1720	-106.3;-108	-106.9	1.32	ATCA	6B	40.000	7	-H₂O -CH₃OH I +CH₃OH II +OH	SFR	7.300		2011 December
8	16 09 52	-51 54 52	330.9531	-0.1805	G330.953-0.182	G330.9530-0.1822	330.953-0.180	Image	Descr	1720 MHz;	1720	-85;-86.8	-86.2	0.75	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.700		2012 January
9	16 35 55.2	-47 38 45.8	336.9409	-0.1563	G336.941-0.156	G336.9410-0.1563	336.941-0.156	Image	Descr	1720 MHz;	1720	-68;-70	-69.4	1.71	ATCA	6B	40.000	7	-H₂O +CH₃OH II +OH	UNK	11.100		2012 January
10	16 38 9.5	-47 05 0.6	337.6124	-0.0598	G337.613-0.060	G337.6125-0.0597	337.612-0.060	Image	Descr	1720 MHz;	1720	-39.5;-41.5	-40.2	0.83	ATCA	6B	40.000	7	+H₂O +CH₃OH II +OH	SFR_MIXED	12.500		2012 January
11	16 46 5.9	-45 36 43.7	339.6219	-0.1205	G339.622-0.121	G339.6220-0.1206	339.622-0.120	Image	Descr	1720 MHz;	1720	-32;-37.3	-34	6.75	ATCA	6B	40.000	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	13.100		2011 January
12	16 52 4.7	-46 08 34.1	339.8840	-1.2588	G339.884-1.259	G339.8840-1.2589	339.884-1.259	Image	Descr	1720 MHz;	1720	-33.6;-39	-37.8	31.85	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.100		2011 September
13	16 50 14.8	-44 42 26.4	340.7850	-0.0959	G340.785-0.096	G340.7850-0.0960	340.785-0.096	Image	Descr	1720 MHz;	1720	-99.5;-107	-105.6	1.47	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	10.600		2011 January
14	17 02 57.7	-41 41 53	344.5816	-0.0234	G344.582-0.024	G344.5816-0.0235	344.582-0.023	Image	Descr	1720 MHz;	1720	-3.5;-4.6	-3.9	3.24	ATCA	6B	40.000	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	17.800		2012 January
15	17 05 11.2	-41 29 07	345.0034	-0.2244	G345.003-0.224	G345.0033-0.2243	345.003-0.224	Image	Descr	1720 MHz;	1720	-28.5;-29.8	-29.3	37	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.700		2010 December
16	16 57 58	-40 16 50.2	345.1175	1.5923	G345.118+1.592	G345.1176+1.5923	345.117+1.592	Image	Descr	1720 MHz;	1720	-15.5;-17.5	-16.6	8.13	ATCA	6B	40.000	7	-CH₃OH II +OH	SFR_MIXED	1.400		2010 December
17	16 59 43.7	-40 03 53.8	345.4955	1.4616	G345.495+1.467	G345.4967+1.4613	345.495+1.462	Image	Descr	1720 MHz;	1720	-26.5;-23	-24	0.69	ATCA	6B	40.000	7	+H₂O +CH₃OH II +OH	GALAXY	1.500		2012 January
18	16 59 44.1	-40 03 50.7	345.4969	1.4613	G345.495+1.467	G345.4967+1.4613	345.497+1.461	Image	Descr	1720 MHz;	1720	-23.5;-17.5	-21.3	1.57	ATCA	6B	40.000	7	+H₂O +CH₃OH II +OH	GALAXY	1.500		2012 January
19	17 20 6.9	-38 57 12.4	348.7268	-1.0387	G348.704-1.038	G348.7272-1.0371	348.727-1.039	Image	Descr	1720 MHz;	1720	-12.5;-14.7	-13.4	1.11	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	3.400		2012 January
20	17 19 25.4	-37 10 6.7	350.1122	0.0952	G350.110+0.085	G350.1131+0.0949	350.112+0.095	Image	Descr	1720 MHz;	1720	-63.5;-67	-66.1	0.66	ATCA	6B	40.000	7	+H₂O -CH₃OH I +CH₃OH II +OH		10.500		2010 December
21	17 23 28.7	-37 01 48.7	350.6860	-0.4909	G350.686-0.491	G350.6861-0.4909	350.686-0.491	Image	Descr	1720 MHz;	1720	-13;-16.7	-15.1	2.95	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.100		2012 June
22	17 19 56.3	-35 57 53.1	351.1582	0.7000	G351.161+0.697	G351.1605+0.6972	351.158+0.699	Image	Descr	1720 MHz;	1720	-7.5;-10.5	-8.6	8.78	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	1.400		2010 December
23	17 20 53.3	-35 47 2.1	351.4166	0.6452	G351.417+0.645	G351.4169+0.6451	351.419+0.646	Image	Descr	1720 MHz;	1720	-9.2;-11	-9.8	101.34	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.300		2012 January
24	17 26 42.5	-36 09 19.8	351.7740	-0.5366	G351.775-0.536	G351.7746-0.5364	351.774-0.537	Image	Descr	1720 MHz;	1720	-2;5.0	4.3	6.28	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1.300		2012 June
25	17 30 26.2	-34 41 44.7	353.4100	-0.3600	G353.410-0.360	G353.4099-0.3602	353.410-0.360	Image	Descr	1720 MHz;	1720	-18.7;-21	-19.4	13.63	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	3.700		2011 January
26	17 40 57.1	-31 10 59.7	357.5574	-0.3209	G357.558-0.321	G357.5576-0.3211	357.557-0.321	Image	Descr	1720 MHz;	1720	0.3;-1	-0.2	0.84	ATCA	6B	40.000	7	+H₂O +CH₃OH II +OH	SFR	17.500		2011 January
27	17 47 20.1	-29 11 56.8	359.9700	-0.4568	G359.9697-0.4574	G359.9697-0.4574	359.970-0.456	Image	Descr	1720 MHz;	1720	14.0;17.5	15.7	0.46	ATCA	6B	40.000	7	+OH	SFR_MIXED	5.500		2011 January
28	17 46 21.4	-28 35 39.4	0.3760	0.0400	G0.3758+0.0401	G0.3758+0.0401	000.376+0.040	Image	Descr	1720 MHz;	1720	40.5;41.8	41.2	1.01	ATCA	6B	40.000	7	+H₂O +CH₃OH II +OH	SFR	12.900		2011 January
29	17 47 20	-28 23 13.2	0.6645	-0.0359	G0.6666-0.0338	G0.6667-0.0337	000.665-0.036	Image	Descr	1720 MHz;	1720	60.0;64.0	61.4	1.53	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +SiO		7.900		2011 January
30	18 06 19	-21 37 33.5	8.6690	-0.3562	G8.669-0.356	G8.6691-0.3560	008.669-0.356	Image	Descr	1720 MHz;	1720	39.0;40.5	39.7	2.25	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.400		2010 December
31	18 08 38.3	-19 51 45.3	10.4737	0.0275	G10.472+0.027	G10.4723+0.0272	010.474+0.027	Image	Descr	1720 MHz;	1720	64.2;65.4	64.7	1.57	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	8.500		2012 January
32	18 09 39.8	-19 21 21.7	11.0338	0.0617	G11.034+0.062	G11.0339+0.0617	011.034+0.062	Image	Descr	1720 MHz;	1720	21.3;24.0	23.1	1.63	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.400		2012 January
33	18 22 26.1	-13 30 09	17.6385	0.1579	G17.638+0.157	G17.6383+0.1566	017.638+0.158	Image	Descr	1720 MHz;	1720	27.0;29.3	28.6	0.48	ATCA	6B	40.000	7	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	2.000		2012 June
34	09 03 7.5	-48 30 56.1	269.1409	-1.2136	G269.141-1.214	G269.1409-1.2136	269.141-1.214	Image	Descr	1720 MHz;	1720	8.5;13.0	10.6	4.35	ATCA	6B	40.000	7	+OH	SFR	2.400		2011 September
35	16 38 52.1	-46 56 17.1	337.8015	-0.0528	G337.802-0.053	G337.8017-0.0527	337.801-0.053	Image	Descr	1720 MHz;	1720	-43.5;-46.8	-44.9	2.02	ATCA	6B	40.000	7	+OH	SFR	12.300		2012 January
36	17 18 1.4	-37 26 24.9	349.7299	0.1665	G349.730+0.172	G349.7301+0.1665	349.729+0.166	Image		1720 MHz;	1720	16.0;17.5	16.8	1.58	ATCA	6B	40.000	7	-CH₃OH II +OH	SFR	20.900		2010 May
37	17 18 00	-37 26 9.1	349.7308	0.1729	G349.730+0.172	G349.7304+0.1725	349.731+0.173	Image		1720 MHz;	1720	15.0;18.0	16.4	0.85	ATCA	6B	40.000	7	-CH₃OH II +OH	SFR	20.800		2010 May
38	17 18 0.9	-37 26 1.8	349.7341	0.1717

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OGB20 - MAGMO: polarimetry of 1720-MHz OH masers towards southern star-forming regions

View as list of objects

Detection table from Ogbodo et al. (2020)