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HUT02 - OH masers and magnetic fields in the bipolar outflow source W75N

Interferometry data

Short title: Hutawarakorn et al. (2002)
Authors: Hutawarakorn, B.Cohen, R. J.Brebner, G. C.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 330, Issue 2, pp. 349-364.
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1665,OH_1667,OH_1720

Abstract
MERLIN polarization measurements of 1665-,1667- and 1720-MHz OH masers in the bipolar outflow source W75N are presented. The OH masers are distributed over a region 5arcsec across (10000au at 2kpc), which is elongated in a north-west-south-east (NW-SE) direction. The distribution is interpreted in terms of a rotating disc orthogonal to the bipolar outflow that is seen in CO and H₂. A compact cluster of OH masers with a large velocity spread appears to mark the source of the outflow. Most of the OH masers detected have strong circular polarization up to 100 per cent. Seven Zeeman groups are identified, including the first example of a complete Zeeman triplet (two Ïƒ-components and one Ï�-component). The field strength measured from Zeeman pairs of opposite circular polarization ranges from -8 to +8mG, with a field reversal on opposite sides of the disc. This is interpreted in terms of a toroidal component of the magnetic field in the disc. Linear polarization is also detected in many of the OH masers with some 1665-MHz masers showing up to 100 per cent linear polarization. The polarization position angles are preferentially along the direction of the bipolar outflow or perpendicular to it. The polarization data lend support to the twisted magnetic field model originally proposed by Uchida & Shibata.

Abstract

MERLIN polarization measurements of 1665-,1667- and 1720-MHz OH masers in the bipolar outflow source W75N are presented. The OH masers are distributed over a region 5arcsec across (10000au at 2kpc), which is elongated in a north-west-south-east (NW-SE) direction. The distribution is interpreted in terms of a rotating disc orthogonal to the bipolar outflow that is seen in CO and H₂. A compact cluster of OH masers with a large velocity spread appears to mark the source of the outflow. Most of the OH masers detected have strong circular polarization up to 100 per cent. Seven Zeeman groups are identified, including the first example of a complete Zeeman triplet (two Ïƒ-components and one Ï�-component). The field strength measured from Zeeman pairs of opposite circular polarization ranges from -8 to +8mG, with a field reversal on opposite sides of the disc. This is interpreted in terms of a toroidal component of the magnetic field in the disc. Linear polarization is also detected in many of the OH masers with some 1665-MHz masers showing up to 100 per cent linear polarization. The polarization position angles are preferentially along the direction of the bipolar outflow or perpendicular to it. The polarization data lend support to the twisted magnetic field model originally proposed by Uchida & Shibata.

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Detection table from Hutawarakorn et al. (2002)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	grpv	#	Source name	Line	Frequency	V_peak	F_peak	Telescope	V_step	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					OH	(MHz)	(km/s)	(Jy/beam)		(km/s)	(mJy/beam)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+20 38 36.441	+42 37 35.4891			81.871441	0.780722	G81.871+0.781	G81.8714+0.7806		W75N	1665 MHz;	1665	-0.06 .. 16.32	0.1 .. 35.72	MERLIN	0.21	20.000	0.16 x 0.14	-23	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 December
	+20 38 36.4917	+42 37 35.263	762 mas	-227 mas	81.871485	0.780561			1	W75N		1665	-0.06	0.73
	+20 38 36.4871	+42 37 35.207	693 mas	-283 mas	81.871464	0.780562			2	W75N		1665	0.69	8.16
	+20 38 36.4874	+42 37 35.297	698 mas	-193 mas	81.871485	0.780577			3	W75N		1665	2.25	0.25
	+20 38 36.4813	+42 37 35.318	607 mas	-172 mas	81.871478	0.780595			4	W75N		1665	3.06	23.29
	+20 38 36.4783	+42 37 36.904	561 mas	1414 mas	81.871822	0.780870			5	W75N		1665	3.73	4.72
	+20 38 36.4604	+42 37 36.526	293 mas	1036 mas	81.871706	0.780850			6	W75N		1665	4.13	2.65
	+20 38 36.4731	+42 37 36.733	483 mas	1243 mas	81.871775	0.780854			7	W75N		1665	5.19	19.42
	+20 38 36.4619	+42 37 36.59	315 mas	1100 mas	81.871722	0.780857			8	W75N		1665	5.76	30.42
	+20 38 36.4527	+42 37 35.929	177 mas	439 mas	81.871559	0.780768			9	W75N		1665	5.95	4.21
	+20 38 36.4215	+42 37 35.68	-290 mas	190 mas	81.871447	0.780802			10	W75N		1665	6.13	1.43
	+20 38 36.4091	+42 37 35.567	-477 mas	77 mas	81.871398	0.780813			11	W75N		1665	6.91	0.34
	+20 38 36.4412	+42 37 35.417	5 mas	-73 mas	81.871425	0.780710			12	W75N		1665	9.41	3.37
	+20 38 36.4537	+42 37 35.937	192 mas	447 mas	81.871563	0.780767			13	W75N		1665	10.44	0.65
	+20 38 36.4317	+42 37 35.208	-138 mas	-282 mas	81.871361	0.780698			14	W75N		1665	12.17	0.22
	+20 38 36.5609	+42 37 34.809	1801 mas	-681 mas	81.871514	0.780315			15	W75N		1665	12.19	0.37
	+20 38 36.5781	+42 37 34.567	2059 mas	-923 mas	81.871492	0.780233			16	W75N		1665	12.22	0.21
	+20 38 36.5525	+42 37 34.519	1674 mas	-971 mas	81.871434	0.780287			17	W75N		1665	12.23	0.1
	+20 38 36.4493	+42 37 35.363	126 mas	-127 mas	81.871428	0.780681			18	W75N		1665	12.26	0.45
	+20 38 36.4422	+42 37 35.409	20 mas	-81 mas	81.871425	0.780706			19	W75N		1665	12.49	0.31
	+20 38 36.4504	+42 37 35.4	143 mas	-90 mas	81.871438	0.780684			20	W75N		1665	12.99	1.78
	+20 38 36.4477	+42 37 35.346	102 mas	-144 mas	81.871421	0.780682			21	W75N		1665	13.67	1.24
	+20 38 36.5593	+42 37 34.814	1777 mas	-676 mas	81.871512	0.780320			22	W75N		1665	16.32	0.29
	+20 38 36.4911	+42 37 35.281	754 mas	-209 mas	81.871488	0.780565			23	W75N		1665	0.04	0.4
	+20 38 36.4869	+42 37 35.206	690 mas	-284 mas	81.871464	0.780563			24	W75N		1665	0.71	9.7
	+20 38 36.4829	+42 37 35.248	631 mas	-242 mas	81.871465	0.780579			25	W75N		1665	2.15	1.23
	+20 38 36.4813	+42 37 35.319	606 mas	-171 mas	81.871478	0.780595			26	W75N		1665	3.04	22.34
	+20 38 36.4832	+42 37 35.213	635 mas	-277 mas	81.871458	0.780573			27	W75N		1665	4.05	0.28
	+20 38 36.4724	+42 37 36.717	473 mas	1227 mas	81.871770	0.780853			28	W75N		1665	5.19	5.5
	+20 38 36.4615	+42 37 36.586	310 mas	1096 mas	81.871721	0.780857			29	W75N		1665	5.76	35.72
	+20 38 36.453	+42 37 35.937	182 mas	447 mas	81.871562	0.780769			30	W75N		1665	5.84	4.06
	+20 38 36.4942	+42 37 35.181	800 mas	-309 mas	81.871472	0.780541			31	W75N		1665	5.98	5.13
	+20 38 36.4599	+42 37 36.565	286 mas	1075 mas	81.871713	0.780858			32	W75N		1665	6.08	8.52
	+20 38 36.4777	+42 37 36.897	552 mas	1407 mas	81.871820	0.780870			33	W75N		1665	6.31	0.66
	+20 38 36.462	+42 37 36.54	317 mas	1050 mas	81.871712	0.780848			34	W75N		1665	6.78	0.44
	+20 38 36.4744	+42 37 36.764	503 mas	1274 mas	81.871784	0.780856			35	W75N		1665	7.29	0.99
	+20 38 36.4613	+42 37 36.561	306 mas	1071 mas	81.871715	0.780854			36	W75N		1665	7.5	1.54
	+20 38 36.5005	+42 37 35.206	894 mas	-284 mas	81.871489	0.780530			37	W75N		1665	8.73	2.54
	+20 38 36.4548	+42 37 36.021	209 mas	531 mas	81.871584	0.780778			38	W75N		1665	9.41	16.08
	+20 38 36.4489	+42 37 35.337	121 mas	-153 mas	81.871422	0.780677			39	W75N		1665	9.83	1.42
	+20 38 36.4538	+42 37 35.96	194 mas	470 mas	81.871568	0.780770			40	W75N		1665	10.41	1.02
	+20 38 36.4543	+42 37 36.124	201 mas	634 mas	81.871605	0.780797			41	W75N		1665	11.12	0.63
	+20 38 36.4454	+42 37 35.48	68 mas	-10 mas	81.871447	0.780710			42	W75N		1665	11.8	1.15
	+20 38 36.5603	+42 37 34.81	1791 mas	-680 mas	81.871513	0.780317			43	W75N		1665	12.17	11.93
	+20 38 36.441	+42 37 35.419	2 mas	-71 mas	81.871425	0.780710			44	W75N		1665	12.49	28
	+20 38 36.4473	+42 37 35.436	96 mas	-54 mas	81.871441	0.780698			45	W75N		1665	13.03	1.05
2	+20 38 36.4292	+42 37 34.8184			81.871271	0.780638	G81.871+0.781	G81.8714+0.7806		W75N	1667 MHz;	1667	0.73 .. 15.34	0.12 .. 23.33	MERLIN	0.21	20.000	0.16 x 0.14	-23	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 December
	+20 38 36.4775	+42 37 34.5778	726 mas	-239 mas	81.871307	0.780480			1	W75N		1667	0.73	0.16
	+20 38 36.4785	+42 37 34.5738	740 mas	-243 mas	81.871308	0.780477			2	W75N		1667	1.95	0.42
	+20 38 36.4798	+42 37 34.5558	760 mas	-261 mas	81.871307	0.780470			3	W75N		1667	4.89	7.53
	+20 38 36.4431	+42 37 35.3968	209 mas	580 mas	81.871424	0.780702			4	W75N		1667	5.57	7.91
	+20 38 36.4629	+42 37 36.0748	506 mas	1258 mas	81.871611	0.780768			5	W75N		1667	5.66	0.7
	+20 38 36.4414	+42 37 35.2548	184 mas	438 mas	81.871390	0.780682			6	W75N		1667	6.53	0.55
	+20 38 36.4799	+42 37 34.6138	761 mas	-203 mas	81.871320	0.780480			7	W75N		1667	6.55	0.18
	+20 38 36.4123	+42 37 37.3858	-252 mas	2569 mas	81.871806	0.781112			8	W75N		1667	6.9	0.18
	+20 38 36.5765	+42 37 32.8928	2210 mas	-1924 mas	81.871120	0.779954			9	W75N		1667	7.07	0.14
	+20 38 36.446	+42 37 35.1698	253 mas	353 mas	81.871379	0.780656			10	W75N		1667	7.09	0.12
	+20 38 36.4345	+42 37 34.8428	81 mas	26 mas	81.871286	0.780629			11	W75N		1667	8.31	0.36
	+20 38 36.4409	+42 37 35.2498	177 mas	433 mas	81.871388	0.780682			12	W75N		1667	9.4	23.33
	+20 38 36.4941	+42 37 34.6508	974 mas	-166 mas	81.871354	0.780452			13	W75N		1667	10.35	0.54
	+20 38 36.5485	+42 37 34.1418	1790 mas	-675 mas	81.871343	0.780233			14	W75N		1667	15.34	0.35
	+20 38 36.4779	+42 37 34.5568	732 mas	-260 mas	81.871304	0.780475			15	W75N		1667	1.11	0.34
	+20 38 36.4802	+42 37 34.5678	766 mas	-249 mas	81.871310	0.780471			16	W75N		1667	2.01	0.32
	+20 38 36.4801	+42 37 34.5548	765 mas	-262 mas	81.871307	0.780469			17	W75N		1667	4.87	3.13
	+20 38 36.4431	+42 37 35.3488	209 mas	532 mas	81.871413	0.780694			18	W75N		1667	5.91	0.31
	+20 38 36.4401	+42 37 35.2418	164 mas	425 mas	81.871384	0.780683			19	W75N		1667	6.45	0.57
	+20 38 36.4429	+42 37 35.4028	206 mas	586 mas	81.871425	0.780703			20	W75N		1667	8.14	5.16
	+20 38 36.4412	+42 37 35.2508	181 mas	434 mas	81.871388	0.780682			21	W75N		1667	9.46	14.57
	+20 38 36.4929	+42 37 34.6488	956 mas	-168 mas	81.871352	0.780454			22	W75N		1667	10.46	0.34
	+20 38 36.4305	+42 37 34.7958	21 mas	-21 mas	81.871268	0.780631			23	W75N		1667	11.86	0.17
	+20 38 36.5492	+42 37 34.1458	1801 mas	-671 mas	81.871346	0.780232			24	W75N		1667	12.76	0.75
3	+20 38 6.34182	+42 37 32.8259			81.814866	0.853631	G81.830+0.853	G81.8149+0.8536		W75N	1720 MHz;	1720	8.9 .. 9.9	0.2 .. 3.7	MERLIN	0.21	40.000	0.16 x 0.14	-23	+OH	SFR		1993 December
	+20 38 6.35069	+42 37 32.961	134 mas	135 mas	81.814912	0.853632			1	W75N		1720	8.9	0.3
	+20 38 6.34936	+42 37 32.936	114 mas	110 mas	81.814904	0.853631			2	W75N		1720	9.7	0.2
	+20 38 6.35109	+42 37 32.96	140 mas	134 mas	81.814913	0.853631			3	W75N		1720	9.9	3.7

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

select MAX(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.grpv) as grpv,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.line) as line,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.pol) as pol,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_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 oh_data_all  LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'HUT02' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.grpv,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.line,oh_data_all.freq,oh_data_all.pol,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'HUT02' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

HUT02 - OH masers and magnetic fields in the bipolar outflow source W75N

Interferometry data

View as list of objects

Detection table from Hutawarakorn et al. (2002)