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SAR01 - Very Long Baseline Array Observations of the Zeeman Effect in H₂O Masers in W3 IRS 5

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Short title: Sarma et al. (2001)
Authors: Sarma, A. P.Troland, T. H.Romney, J. D.
Journal: The Astrophysical Journal, Volume 554, Issue 2, pp. L217-L220.
Bibcode:

Target type: YSO
Transitions: H2O_22

Abstract
We present Very Long Baseline Array (VLBA) observations of the Zeeman effect in H₂O masers in W3 IRS 5. These observations have yielded the first ultrahigh spatial resolution maps of the magnetic field in a star-forming region measured via the Zeeman effect-masers for which we can independently measure the magnetic field are separated by <=25 mas (60 AU). This is the first VLBA detection of the Zeeman effect in H₂O masers in a star-forming region. These observations also remove the confusion in observed magnetic fields from closely spaced masers. We shall explicitly demonstrate that observations at lower resolution can yield lower magnetic fields than with the VLBA, even though there are no field reversals within the larger beam.

Abstract

We present Very Long Baseline Array (VLBA) observations of the Zeeman effect in H₂O masers in W3 IRS 5. These observations have yielded the first ultrahigh spatial resolution maps of the magnetic field in a star-forming region measured via the Zeeman effect-masers for which we can independently measure the magnetic field are separated by <=25 mas (60 AU). This is the first VLBA detection of the Zeeman effect in H₂O masers in a star-forming region. These observations also remove the confusion in observed magnetic fields from closely spaced masers. We shall explicitly demonstrate that observations at lower resolution can yield lower magnetic fields than with the VLBA, even though there are no field reversals within the larger beam.

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Detection table from Sarma et al. (2001)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_peak	F_peak	Telescope	V_step	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(Jy/beam)		(km/s)	(mJy/beam)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+02 25 40.7635	+62 05 52.643			133.715119	1.215518	G133.715+1.215		W3 IRS 5 C	Image	Descr	22 GHz;	-39.94	713.2	VLBA	0.11	16.000	0.00067 x 0.00033	-4.4	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		2000 Jan 9
	+02 25 40.7635	+62 05 52.6416	0 mas	0 mas	133.715119	1.215517		1	W3 IRS 5 C				-39.94	713.2
2	+02 25 40.7635	+62 05 52.643			133.715119	1.215518	G133.715+1.215		W3 IRS 5 NW			22 GHz;	-39.54	326.5	VLBA	0.11	16.000	0.00067 x 0.00033	-4.4	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		2000 Jan 9
	+02 25 40.7625	+62 05 52.6528	-14.8 mas	11.2 mas	133.715116	1.215519		1	W3 IRS 5 NW				-39.54	326.5
3	+02 25 40.7635	+62 05 52.643			133.715119	1.215518	G133.715+1.215		W3 IRS 5 nearSE			22 GHz;	-39.1	123.2	VLBA	0.11	16.000	0.00067 x 0.00033	-4.4	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		2000 Jan 9
	+02 25 40.7648	+62 05 52.6248	19.5 mas	-16.8 mas	133.715123	1.215514		1	W3 IRS 5 nearSE				-39.1	123.2
4	+02 25 40.7635	+62 05 52.643			133.715119	1.215518	G133.715+1.215		W3 IRS 5 SE			22 GHz;	-39.78	445.5	VLBA	0.11	16.000	0.00067 x 0.00033	-4.4	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		2000 Jan 9
	+02 25 40.7656	+62 05 52.6001	31 mas	-41.5 mas	133.715127	1.215508		1	W3 IRS 5 SE				-39.78	445.5

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	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(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_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 h2o_data_all  LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line"  WHERE ref ilike 'SAR01' AND detected=true AND hide=false GROUP BY ref

select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all   LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line"  WHERE ref ilike 'SAR01' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

SAR01 - Very Long Baseline Array Observations of the Zeeman Effect in H2O Masers in W3 IRS 5

Interferometry data

View as list of objects

Detection table from Sarma et al. (2001)

SAR01 - Very Long Baseline Array Observations of the Zeeman Effect in H₂O Masers in W3 IRS 5