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GAS02 - OH masers and magnetic fields near the cometary HII region G34.3+0.2

Interferometry data

Short title: Gasiprong et al. (2002)
Authors: Gasiprong, N.Cohen, R. J.Hutawarakorn, B.
Journal: Monthly Notice of the Royal Astronomical Society, Volume 336, Issue 1, pp. 47-54.
Bibcode:
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Target type: HII
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1665,OH_1667

Abstract
MERLIN maps of OH 1665- and 1667-MHz masers in the source G34.3+0.2 are presented. The majority of the OH masers lie in a parabolic arc along the eastern edge of the cometary H II region G34.3+0.2C, possibly tracing a bow shock. The OH masers lie systematically closer to the cometary HII region than the H₂O masers, suggesting that OH is formed by dissociation of H₂O in the shock. The remaining OH masers cluster around the ultracompact HII region G34.3+0.2B. Zeeman splitting indicates a magnetic field strength of typically -5 mG (directed towards us). A complex magnetic field structure is inferred from the maser polarization. Linear polarization is detected in half of the masers, at levels up to 85 per cent. The linear polarization vectors suggest that the magnetic field in some regions near the cometary HII region is perpendicular to the curved edge of the bow shock.

Abstract

MERLIN maps of OH 1665- and 1667-MHz masers in the source G34.3+0.2 are presented. The majority of the OH masers lie in a parabolic arc along the eastern edge of the cometary H II region G34.3+0.2C, possibly tracing a bow shock. The OH masers lie systematically closer to the cometary HII region than the H₂O masers, suggesting that OH is formed by dissociation of H₂O in the shock. The remaining OH masers cluster around the ultracompact HII region G34.3+0.2B. Zeeman splitting indicates a magnetic field strength of typically -5 mG (directed towards us). A complex magnetic field structure is inferred from the maser polarization. Linear polarization is detected in half of the masers, at levels up to 85 per cent. The linear polarization vectors suggest that the magnetic field in some regions near the cometary HII region is perpendicular to the curved edge of the bow shock.

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Detection table from Gasiprong 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	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					OH	(MHz)	(km/s)	(Jy/beam)		(km/s)	(mJy/beam)	(arcsec)	Yes/No		(kpc)
1	+18 53 18.6152	+01 14 58.828			34.257533	0.153302	G34.257+0.153	G34.2575+0.1531		G34.3+0.2	1665 MHz;	1665	51.7 .. 64.47	0.12 .. 90.02	MERLIN	0.21	12.000	0.293 x 0.158	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1995 Dec 25-26
	+18 53 18.6152	+01 14 58.828	0 mas	0 mas	34.257533	0.153302			1	G34.3+0.2		1665	51.88	0.17
	+18 53 18.6152	+01 14 59.27	1.67002 mas	443.59 mas	34.257642	0.153358			2	G34.3+0.2		1665	53.98	0.41
	+18 53 18.5753	+01 14 56.4651	-597.066 mas	-2361.28 mas	34.256873	0.153151			3	G34.3+0.2		1665	54.67	0.21
	+18 53 18.6007	+01 14 56.5119	-216.274 mas	-2314.47 mas	34.256933	0.153063			4	G34.3+0.2		1665	54.85	0.12
	+18 53 18.6044	+01 14 56.5512	-160.958 mas	-2275.21 mas	34.256950	0.153054			5	G34.3+0.2		1665	55.55	0.24
	+18 53 18.5754	+01 14 56.4631	-595.556 mas	-2363.27 mas	34.256873	0.153150			6	G34.3+0.2		1665	55.72	0.41
	+18 53 18.6434	+01 14 56.946	423.692 mas	-1880.44 mas	34.257121	0.152959			7	G34.3+0.2		1665	55.9	3.13
	+18 53 18.6776	+01 14 59.8664	937.877 mas	1040.03 mas	34.257908	0.153202			8	G34.3+0.2		1665	55.9	28.53
	+18 53 18.591	+01 14 56.4032	-361.264 mas	-2423.16 mas	34.256888	0.153085			9	G34.3+0.2		1665	57.48	0.38
	+18 53 18.6417	+01 14 58.0029	399.185 mas	-823.542 mas	34.257380	0.153099			10	G34.3+0.2		1665	58.18	18.56
	+18 53 18.6643	+01 15 0.113482	737.2 mas	1287.08 mas	34.257944	0.153283			11	G34.3+0.2		1665	58.53	6.57
	+18 53 18.6463	+01 15 0.00320458	467.713 mas	1176.8 mas	34.257883	0.153336			12	G34.3+0.2		1665	59.05	4.53
	+18 53 18.6771	+01 14 59.9494	929.984 mas	1122.99 mas	34.257928	0.153215			13	G34.3+0.2		1665	59.23	1.05
	+18 53 18.6406	+01 14 58.0668	382.382 mas	-759.621 mas	34.257393	0.153112			14	G34.3+0.2		1665	59.58	1.54
	+18 53 18.6653	+01 14 59.9466	752.991 mas	1120.15 mas	34.257905	0.153258			15	G34.3+0.2		1665	60.63	0.49
	+18 53 18.6991	+01 15 0.588962	1259.97 mas	1762.56 mas	34.258128	0.153214			16	G34.3+0.2		1665	61.15	0.22
	+18 53 18.6422	+01 14 57.9999	406.7 mas	-826.507 mas	34.257380	0.153097			17	G34.3+0.2		1665	61.32	5.56
	+18 53 18.5363	+01 15 0.6364	-1182.34 mas	1810 mas	34.257830	0.153824			18	G34.3+0.2		1665	62.72	1.93
	+18 53 18.6817	+01 15 0.509727	999.332 mas	1683.33 mas	34.258075	0.153269			19	G34.3+0.2		1665	64.47	0.33
	+18 53 18.6154	+01 14 59.286	4.59427 mas	459.604 mas	34.257647	0.153359			20	G34.3+0.2		1665	51.7	0.5
	+18 53 18.6367	+01 14 56.9065	323.376 mas	-1919.91 mas	34.257099	0.152979			21	G34.3+0.2		1665	54.33	0.12
	+18 53 18.6143	+01 14 57.6559	-11.6855 mas	-1170.49 mas	34.257242	0.153157			22	G34.3+0.2		1665	55.03	0.16
	+18 53 18.6048	+01 14 56.5732	-155.062 mas	-2253.18 mas	34.256956	0.153055			23	G34.3+0.2		1665	55.55	3.34
	+18 53 18.5763	+01 14 56.5062	-582.26 mas	-2320.21 mas	34.256885	0.153152			24	G34.3+0.2		1665	55.9	0.24
	+18 53 18.6489	+01 15 0.258393	507.006 mas	1431.99 mas	34.257951	0.153358			25	G34.3+0.2		1665	56.43	0.28
	+18 53 18.6234	+01 14 57.3236	124.893 mas	-1502.85 mas	34.257177	0.153081			26	G34.3+0.2		1665	56.6	3.24
	+18 53 18.5894	+01 14 56.3971	-385.236 mas	-2429.27 mas	34.256883	0.153090			27	G34.3+0.2		1665	57.3	57.3
	+18 53 18.6421	+01 14 57.9959	405.219 mas	-830.514 mas	34.257379	0.153097			28	G34.3+0.2		1665	58.35	90.02
	+18 53 18.664	+01 15 0.12446	732.648 mas	1298.06 mas	34.257946	0.153286			29	G34.3+0.2		1665	58.53	5.51
	+18 53 18.6454	+01 15 0.0191405	454.137 mas	1192.74 mas	34.257885	0.153341			30	G34.3+0.2		1665	59.05	2.47
	+18 53 18.6751	+01 14 59.8693	900.363 mas	1042.85 mas	34.257904	0.153212			31	G34.3+0.2		1665	59.23	15
	+18 53 18.6475	+01 14 59.9993	485.732 mas	1172.89 mas	34.257884	0.153331			32	G34.3+0.2		1665	59.93	0.28
	+18 53 18.6804	+01 15 0.530635	979.733 mas	1704.23 mas	34.258078	0.153276			33	G34.3+0.2		1665	59.93	1.75
	+18 53 18.5366	+01 15 0.644421	-1177.88 mas	1818.02 mas	34.257833	0.153824			34	G34.3+0.2		1665	60.45	0.43
	+18 53 18.5574	+01 15 0.286895	-865.676 mas	1460.5 mas	34.257784	0.153701			35	G34.3+0.2		1665	60.63	0.15
	+18 53 18.6659	+01 14 59.9506	761.973 mas	1124.2 mas	34.257907	0.153256			36	G34.3+0.2		1665	60.63	0.57
	+18 53 18.623	+01 14 56.7745	118.494 mas	-2051.88 mas	34.257040	0.153013			37	G34.3+0.2		1665	60.98	0.4
	+18 53 18.6407	+01 14 58.0118	384.143 mas	-814.613 mas	34.257380	0.153104			38	G34.3+0.2		1665	61.33	0.23
	+18 53 18.6472	+01 14 59.9953	481.251 mas	1168.87 mas	34.257883	0.153332			39	G34.3+0.2		1665	62.72	0.55
2	+18 53 18.612	+01 14 59.2718			34.257637	0.15337	G34.257+0.153	G34.2575+0.1531		G34.3+0.2	1667 MHz;	1667	51.89 .. 62.32	0.12 .. 156.14	MERLIN	0.21	12.000	0.293 x 0.158	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1995 Dec 25-26
	+18 53 18.612	+01 14 59.2718	0 mas	0 mas	34.257637	0.153370			1	G34.3+0.2		1667	53.33	0.23
	+18 53 18.6106	+01 14 59.2517	-20.4456 mas	-21.1364 mas	34.257629	0.153373			2	G34.3+0.2		1667	54.22	0.12
	+18 53 18.5843	+01 14 56.3668	-414.795 mas	-2906.04 mas	34.256866	0.153105			3	G34.3+0.2		1667	57.46	9.16
	+18 53 18.6048	+01 14 56.4912	-107.874 mas	-2781.58 mas	34.256936	0.153045			4	G34.3+0.2		1667	58.72	0.32
	+18 53 18.6369	+01 14 58.0415	373.8 mas	-1231.28 mas	34.257380	0.153122			5	G34.3+0.2		1667	58.72	156.14
	+18 53 18.6374	+01 14 58.0186	381.409 mas	-1254.25 mas	34.257375	0.153117			6	G34.3+0.2		1667	60.7	2.02
	+18 53 18.5327	+01 15 0.647144	-1189.6 mas	1374.34 mas	34.257826	0.153839			7	G34.3+0.2		1667	62.32	1.31
	+18 53 18.6123	+01 14 59.2958	4.84635 mas	22.9838 mas	34.257643	0.153372			8	G34.3+0.2		1667	51.89	0.17
	+18 53 18.5842	+01 14 56.3768	-416.342 mas	-2896.04 mas	34.256868	0.153107			9	G34.3+0.2		1667	57.46	7.87
	+18 53 18.6365	+01 14 58.0445	367.785 mas	-1228.31 mas	34.257380	0.153124			10	G34.3+0.2		1667	58.54	54.47
	+18 53 18.5319	+01 15 0.630087	-1201.52 mas	1357.29 mas	34.257820	0.153839			11	G34.3+0.2		1667	60.88	0.22

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 'GAS02' 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 'GAS02' AND detected=true AND hide=false ORDER BY detected DESC,id

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GAS02 - OH masers and magnetic fields near the cometary HII region G34.3+0.2

Interferometry data

View as list of objects

Detection table from Gasiprong et al. (2002)