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BAR05 - Magnetic field in Cepheus A as deduced from OH maser polarimetric observations

Interferometry data

Short title: Bartkiewicz et al. (2005)
Authors: Bartkiewicz, A.Szymczak, M.Cohen, R. J.Richards, A. M. S.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 361, Issue 2, pp. 623-632.
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1612,OH_1665,OH_1667,OH_1720

Abstract
We present the results of MERLIN polarization mapping of OH masers at 1665 and 1667MHz towards the CepheusA star-forming region. The maser emission is spread over a region of 6 × 10 arcsec², twice the extent previously detected. In contrast to the 22-GHz water masers, the OH masers associated with HII regions show neither clear velocity gradients nor regular structures. We identified 10 Zeeman pairs which imply a magnetic field strength along the line of sight from -17.3 to +12.7mG. The magnetic field is organized on the arcsecond scale, pointing towards us in the west and away from us in the east side. The linearly polarized components, detected for the first time, show regularities in the polarization position angles depending on their position. The electric vectors of OH masers observed towards the outer parts of HII regions are consistent with the interstellar magnetic field orientation, while those seen towards the centres of HII regions are parallel to the radio jets. A Zeeman quartet inside a southern HII region has now been monitored for 25 years; we confirm that the magnetic field decays monotonically over that period.

Abstract

We present the results of MERLIN polarization mapping of OH masers at 1665 and 1667MHz towards the CepheusA star-forming region. The maser emission is spread over a region of 6 × 10 arcsec², twice the extent previously detected. In contrast to the 22-GHz water masers, the OH masers associated with HII regions show neither clear velocity gradients nor regular structures. We identified 10 Zeeman pairs which imply a magnetic field strength along the line of sight from -17.3 to +12.7mG. The magnetic field is organized on the arcsecond scale, pointing towards us in the west and away from us in the east side. The linearly polarized components, detected for the first time, show regularities in the polarization position angles depending on their position. The electric vectors of OH masers observed towards the outer parts of HII regions are consistent with the interstellar magnetic field orientation, while those seen towards the centres of HII regions are parallel to the radio jets. A Zeeman quartet inside a southern HII region has now been monitored for 25 years; we confirm that the magnetic field decays monotonically over that period.

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Detection table from Bartkiewicz et al. (2005)

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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	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					OH	(MHz)	(km/s)	(Jy/beam)		(mJy/beam)	(arcsec)	(deg.)	Yes/No		(kpc)
1	00 00 00	00 00 00			96.33727	-60.188552	G96.337-60.189	G96.3373-60.1886		Cep A	1612 MHz;	1612	..	..	MERLIN	3.000	0.18 x 0.14	-27	-H₂O +OH			1999 May 20 and June 16
2	+22 56 18.1646	+62 01 49.673			109.871345	2.11417	G109.871+2.115	G109.8713+2.1144		Cep A	1665 MHz;	1665	-25.2 .. -0.6	0.066 .. 16.25	MERLIN	5.000	0.149 x 0.12	-7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1999 May 20 and 30
	+22 56 18.1646	+62 01 49.673	0 mas	0 mas	109.871345	2.114170			1	Cep A		1665	-18	0.174
	+22 56 18.1143	+62 01 46.316	-755.1 mas	-3358 mas	109.870856	2.113370			2	Cep A		1665	-14.2	5.24
	+22 56 17.9474	+62 01 49.839	-3258.6 mas	165 mas	109.870982	2.114394			3	Cep A		1665	-14.2	0.359
	+22 56 18.0976	+62 01 49.343	-1005.6 mas	-331 mas	109.871188	2.114143			4	Cep A		1665	-13.1	0.359
	+22 56 18.1464	+62 01 47.03	-273.6 mas	-2644 mas	109.870998	2.113522			5	Cep A		1665	-12.3	0.301
	+22 56 18.2134	+62 01 46.51	731.4 mas	-3164 mas	109.871055	2.113335			6	Cep A		1665	-11.9	0.066
	+22 56 17.9699	+62 01 50.012	-2921.1 mas	338 mas	109.871042	2.114418			7	Cep A		1665	-11.7	0.13
	+22 56 18.1352	+62 01 46.487	-441.6 mas	-3187 mas	109.870914	2.113395			8	Cep A		1665	-11.6	2.07
	+22 56 17.8662	+62 01 48.812	-4476.6 mas	-862 mas	109.870716	2.114204			9	Cep A		1665	-11.5	0.196
	+22 56 17.8843	+62 01 46.508	-4205.1 mas	-3166 mas	109.870473	2.113611			10	Cep A		1665	-11.2	0.515
	+22 56 17.9978	+62 01 49.678	-2502.6 mas	4 mas	109.871051	2.114311			11	Cep A		1665	-8	0.131
	+22 56 17.9084	+62 01 50.6132	-3843.6 mas	939.2 mas	109.871005	2.114621			12	Cep A		1665	-7	0.09
	+22 56 17.9985	+62 01 49.667	-2492.1 mas	-7 mas	109.871051	2.114308			13	Cep A		1665	-2.8	0.135
	+22 56 17.9111	+62 01 49.361	-3803.1 mas	-313 mas	109.870860	2.114304			14	Cep A		1665	-0.6	0.423
	+22 56 17.9498	+62 01 49.843	-3222.6 mas	169 mas	109.870986	2.114393			15	Cep A		1665	-0.6	15.37
	+22 56 17.7829	+62 01 53.363	-5726.1 mas	3689 mas	109.871111	2.115416			16	Cep A		1665	-0.6	1.097
	+22 56 17.9582	+62 01 49.175	-3089.4 mas	-491.8 mas	109.870921	2.114218			17	Cep A		1665	-7.7	0.209
	+22 56 17.9478	+62 01 49.868	-3245.4 mas	201.2 mas	109.870986	2.114401			18	Cep A		1665	-6.7	0.583
	+22 56 18.1163	+62 01 49.386	-717.9 mas	-280.8 mas	109.871226	2.114138			19	Cep A		1665	-6.2	4.59
	+22 56 17.9488	+62 01 52.906	-3230.4 mas	3239.2 mas	109.871350	2.115162			20	Cep A		1665	-6.2	0.374
	+22 56 17.8903	+62 01 46.497	-4107.9 mas	-3169.8 mas	109.870482	2.113603			21	Cep A		1665	-6.1	0.156
	+22 56 18.0778	+62 01 48.881	-1295.4 mas	-785.8 mas	109.871098	2.114044			22	Cep A		1665	-6.1	0.167
	+22 56 18.0497	+62 01 47.552	-1716.9 mas	-2114.8 mas	109.870890	2.113734			23	Cep A		1665	-4.9	0.481
	+22 56 17.8407	+62 01 49.898	-4851.9 mas	231.2 mas	109.870800	2.114498			24	Cep A		1665	-2.4	0.293
	+22 56 17.952	+62 01 49.848	-3182.4 mas	181.2 mas	109.870991	2.114392			25	Cep A		1665	-0.7	0.109
3	+22 56 18.1123	+62 01 46.306			109.870852	2.113369	G109.871+2.115	G109.8713+2.1144		Cep A	1667 MHz;	1667	-15.7 .. -3.1	0.58 .. 4.831	MERLIN	4.000	0.148 x 0.119	-11	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1999 May 20 and 30
	+22 56 18.1123	+62 01 46.306	0 mas	0 mas	109.870852	2.113369			1	Cep A		1667	-14.6	3.962
	+22 56 17.8358	+62 01 49.912	-4147.8 mas	3607.6 mas	109.870793	2.114505			2	Cep A		1667	-5.4	0.611
	+22 56 18.1096	+62 01 46.334	-4134 mas	3597.2 mas	109.870850	2.113378			3	Cep A		1667	-3.1	0.58
	+22 56 17.8372	+62 01 49.899	-8220 mas	7162.2 mas	109.870794	2.114501			4	Cep A		1667	-3.1	2.907
4	+22 56 17.6147	+62 01 44.517			109.869759	2.113337	G109.871+2.115	G109.8713+2.1144		Cep A	1720 MHz;	1720	-15.4 .. -13.3	1.122 .. 1.2354	MERLIN	3.000	0.154 x 0.107	-24	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1999 May 20 and June 16
	+22 56 17.6147	+62 01 44.517	0 mas	0 mas	109.869759	2.113337			1	Cep A		1720	-15.4	1.122

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 'BAR05' 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 'BAR05' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

BAR05 - Magnetic field in Cepheus A as deduced from OH maser polarimetric observations

Interferometry data

View as list of objects

Detection table from Bartkiewicz et al. (2005)