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HUT99 - Magnetic field structure in the bipolar outflow source G 35.2-0.74N: MERLIN spectral line results

Short title: Hutawarakorn & Cohen (1999)
Authors: Hutawarakorn, B.Cohen, R. J.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 4, pp. 845-854.
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1665

Abstract
MERLIN polarization measurements of the OH 1665-MHz maser emission from the bipolar outflow source G 35.2-0.74N are presented. The masers have an elongated distribution, and a velocity gradient which is interpreted in terms of a disc surrounding the source of the outflow. The radius of the maser disc is 1.3 arcsec (2600 au at 2 kpc). Analysis of the OH maser polarization reveals four Zeeman pairs, with field strengths ranging from -2.5 to +5.3 mG. The direction of the field reverses on opposite sides of the disc. Linear polarization is found in five of the masers, and is used to infer the three-dimensional magnetic field direction at these points. The data lend support to the hydromagnetic model proposed by Uchida & Shibata.

Abstract

MERLIN polarization measurements of the OH 1665-MHz maser emission from the bipolar outflow source G 35.2-0.74N are presented. The masers have an elongated distribution, and a velocity gradient which is interpreted in terms of a disc surrounding the source of the outflow. The radius of the maser disc is 1.3 arcsec (2600 au at 2 kpc). Analysis of the OH maser polarization reveals four Zeeman pairs, with field strengths ranging from -2.5 to +5.3 mG. The direction of the field reverses on opposite sides of the disc. Linear polarization is found in five of the masers, and is used to infer the three-dimensional magnetic field direction at these points. The data lend support to the hydromagnetic model proposed by Uchida & Shibata.

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Detection table from Hutawarakorn & Cohen (1999)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	V_peak	F_peak	Telescope	Beam	Detection	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)				(km/s)	(Jy)		(arcsec)	Yes/No	(kpc)
1	18 58 17.6	-01 36 33.3	32.2805	-2.2589	G32.280-2.259	G32.2805-2.2589	G 35.2-0.74N	28.74	9.22	MERLIN	230 x 160	+OH		1993 Dec

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
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

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 'HUT99' 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 'HUT99' AND detected=true AND hide=false ORDER BY detected DESC,id

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HUT99 - Magnetic field structure in the bipolar outflow source G 35.2-0.74N: MERLIN spectral line results

View as list of objects

Detection table from Hutawarakorn & Cohen (1999)