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• Target type: High_mass_SFR
  Observations category: polarization
  Facility type: mixed
  

• Abstract

  Linear polarization of water-maser emission at 22.235 GHz was measured for astronomical sources using a single-dish telescope (Haystack Observatory) and an interferometer (the VLA). Of the 25 star-forming regions observed using single-dish polarimetry, eight had linearly polarized features. None of the 17 stellar maser sources showed measurable (greater than a few percent) linear or circular polarization in the single-dish observations. No linear polarization stronger than 7% was detected from the galactic nucleus of NGC 3079. In current theories, the direction of linear polarization is predicted to be parallel or perpendicular to the projection of the magnetic field in protostellar clouds, and thus can potentially provide information on field configurations in these regions if high angular resolution can be achieved. We were successful in mapping the direction of polarization for a few water-maser spots toward Orion KL, Orion B, NGC 2071, and W51, using the VLA in continuum mode. We discuss these observations within the context of the theory of molecular alignment and maser beaming in magnetic fields.

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Image	Line	Fpeak	Telescope	Beam	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					H2O	(Jy)		(arcsec)	Yes/No		(kpc)	(kpc)
1	02 19 20.7	-02 58 26.2	167.7501	-57.9800	G167.754-57.983	G167.7501-57.9802	o Cet		22 GHz;	6.00	HAYS	90	+H2O -OH +SiO	EVOLVED	0.300		1986 Mar 22-25
2	02 22 52.6	+58 34 56.1	134.6240	-2.1983	G134.621-2.195	G134.6207-2.1950	S Per		22 GHz;	75.90	HAYS	90	+H2O +OH +SiO	UNK	5.000		1986 Mar 22-25
3	04 01 31.3	+11 24 2.6	179.4729	-29.9360	G179.473-29.936	G179.4729-29.9360	IKTau		22 GHz;	83.60	HAYS	90	+H2O		0.300		1986 Mar 22-25
4	04 11 31.8	-25 08 01	222.1657	-45.3433	G222.165-45.346	G222.1652-45.3463	W Eri		22 GHz;	31.90	HAYS	90	+H2O +OH +SiO	EVOLVED	0.700		1986 Mar 22-25
5	04 31 7.8	+27 29 49.2	171.3832	-14.0726	G171.387-14.079	G171.3832-14.0726	IRC 30087		22 GHz;	3.00	HAYS	90	+H2O -OH	EVOLVED			1986 Mar 22-25
6	05 19 48.9	+63 15 58.9	148.2805	14.5615	G148.285+14.565	G148.2805+14.5615	IRC 60154		22 GHz;	95.70	HAYS	90	+H2O +OH +SiO	EVOLVED			1986 Mar 22-25
7	05 55 49.3	+20 10 30.8	188.7153	-2.4917	G188.715-2.492	G188.7151-2.4921	U Ori		22 GHz;	221.00	HAYS	90	+H2O +OH +SiO	EVOLVED	0.300		1986 Mar 22-25
8	06 34 34.9	+60 56 33.2	154.3091	21.5200	G154.310+21.517	G154.3098+21.5170	IRC 60169		22 GHz;	281.00	HAYS	90	+H2O +OH +SiO	EVOLVED			1986 Mar 22-25
9	06 40 45.5	+59 54 36.3	155.6118	21.9471	G155.612+21.947	G155.6118+21.9471	U Lyn		22 GHz;	6.00	HAYS	90	+H2O				1986 Mar 22-25
10	07 22 58.6	-25 46 2.8	239.3529	-5.0645	G239.352-5.065	G239.3524-5.0655	VY CMa		22 GHz;	1268.00	HAYS	90	+H2O -CH3OH I -CH3OH II +OH +SiO	EVOLVED			1986 Mar 22-25