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BAY13 - Magnetic fields in methanol maser condensations based on data for related regions. Seven sources: Observational parameters

Short title: Bayandina et al. (2013)
Authors: Bayandina, O. S.Alakoz, A. V.Val'tts, I. E.
Journal: Astronomy Reports, Volume 57, Issue 12, pp.889-903
Bibcode:

Target type: Known_Class_I,Known_Class_II
Transitions: OH_1665,OH_1667

Abstract
Results of polarization observations of gas-dust condensations obtained on the NanÃ�ay radio telescope in the 1665 and 1667 MHz OH lines in all four Stokes parameters are reported. Seven OH maser sources associated with methanol masers were selected for this study. The goal was to estimate the magnetic fields in methanol condensations from the Zeeman splitting of OH maser lines associated with the methanol masers. The Gaussian parameters of features in the OH spectra are presented, and their polarization parameters are estimated: the degree of circular polarization m _C, flux density in linear polarization p, and degree of linear polarization m _L. The magnetic field intensity B has been estimated from the Zeeman splitting of the OH lines and approximation of the Stokes parameter V from the derivative of Stokes parameter I. B varies from â��0.5 to 1.4 mG for different sources. The association of OH masers with methanol emission has been analyzed; the magnetic fields of OH masers in interstellar condensations associated with Class I methanol masers can be determined more reliably than the fields in interstellar condensations with OH masers associated with Class II methanol emission, and have higher values. The sizes of the studied regions suggest they may be bound structures such as Bok globules, small IRDC clouds, or protoplanetary disks.

Abstract

Results of polarization observations of gas-dust condensations obtained on the NanÃ�ay radio telescope in the 1665 and 1667 MHz OH lines in all four Stokes parameters are reported. Seven OH maser sources associated with methanol masers were selected for this study. The goal was to estimate the magnetic fields in methanol condensations from the Zeeman splitting of OH maser lines associated with the methanol masers. The Gaussian parameters of features in the OH spectra are presented, and their polarization parameters are estimated: the degree of circular polarization m _C, flux density in linear polarization p, and degree of linear polarization m _L. The magnetic field intensity B has been estimated from the Zeeman splitting of the OH lines and approximation of the Stokes parameter V from the derivative of Stokes parameter I. B varies from â��0.5 to 1.4 mG for different sources. The association of OH masers with methanol emission has been analyzed; the magnetic fields of OH masers in interstellar condensations associated with Class I methanol masers can be determined more reliably than the fields in interstellar condensations with OH masers associated with Class II methanol emission, and have higher values. The sizes of the studied regions suggest they may be bound structures such as Bok globules, small IRDC clouds, or protoplanetary disks.

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Detection table from Bayandina et al. (2013)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Descr.	Frequency	V_range	V_peak	FWHM	F_peak	∫F dv	Telescope	V_step	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					(MHz)	(km/s)	(km/s)	(km/s)	(Jy)	(Jy*km/s)		(km/s)	Yes/No		(kpc)
1	18 00 30.6	-24 04 0.9	5.8857	-0.3930	G5.885-0.392	G5.886-0.393	Image	Descr	1665	6;17	9.5 (0.05)	0.4 (0.2)	6.2	2.9 (0.2)	NANCAY	0.137	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		2003 Oct
	18 00 30.6	-24 04 0.9	5.8857	-0.3930	G5.885-0.392	G5.886-0.393	Image		1665	6;17	10.3 (0.05)	0.6 (0.2)	4.5	2.7 (0.6)	NANCAY	0.137	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		2003 Oct
	18 00 30.6	-24 04 0.9	5.8857	-0.3930	G5.885-0.392	G5.886-0.393	Image		1667	6;17	9.7 (0.02)	0.3 (0.06)	10.7	3.7 (0.5)	NANCAY	0.137	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		2003 Oct
	18 00 30.6	-24 04 0.9	5.8857	-0.3930	G5.885-0.392	G5.886-0.393	Image		1667	6;17	10.2 (0.02)	0.3 (0.06)	9.6	3.5 (0.5)	NANCAY	0.137	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		2003 Oct
5	18 12 2.5	-18 31 56.8	12.0263	-0.0337	G12.026-0.031	G12.03-0.03	Image	Descr	1665	103;112	109.0 (0.03)	0.4(0.05)	0.6	0.25 (0.03)	NANCAY	0.137	-H₂O -CH₃OH I +CH₃OH II -OH	SFR		2003 Oct
	18 12 2.5	-18 31 56.8	12.0263	-0.0337	G12.026-0.031	G12.03-0.03	Image		1667	103;112	106.7 (0.03)	0.2 (0.2)	0.4	0.06 (0.02)	NANCAY	0.137	-H₂O -CH₃OH I +CH₃OH II -OH	SFR		2003 Oct
	18 12 2.5	-18 31 56.8	12.0263	-0.0337	G12.026-0.031	G12.03-0.03	Image		1667	103;112	106.8 (0.04)	0.2 (0.1)	0.4	0.07 (0.03)	NANCAY	0.137	-H₂O -CH₃OH I +CH₃OH II -OH	SFR		2003 Oct
8	18 27 43.9	-11 15 04	20.2333	0.0665	G20.237+0.065	G20.23+0.07	Image	Descr	1665	69;79	73.8 (0.02)	0.7 (0.1)	2.9	2.1 (0.2)	NANCAY	0.137	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		2003 Oct
9	18 51 21.9	+00 12 6.4	33.1031	0.1084	G33.103+0.108	G33.103+0.108	Image	Descr	1665	75;83	79.8 (0.02)	0.3 (0.06)	1	0.3 (0.1)	NANCAY	0.137	+CH₃OH II +OH			2003 Oct
	18 51 21.9	+00 12 6.4	33.1031	0.1084	G33.103+0.108	G33.103+0.108	Image		1665	75;83	79.7 (0.01)	0.3 (0.02)	2.5	0.8 (0.1)	NANCAY	0.137	+CH₃OH II +OH			2003 Oct
	18 51 21.9	+00 12 6.4	33.1031	0.1084	G33.103+0.108	G33.103+0.108	Image		1667	75;83	78.1 (0.08)	0.1 (0.95)	0.2	0.02 (0.03)	NANCAY	0.137	+CH₃OH II +OH			2003 Oct
	18 51 21.9	+00 12 6.4	33.1031	0.1084	G33.103+0.108	G33.103+0.108	Image		1667	75;83	78.0 (0.01)	0.2 (0.02)	2.5	0.63 (0.03)	NANCAY	0.137	+CH₃OH II +OH			2003 Oct
13	17 16 25.4	-37 59 35.8	349.0957	0.1049	G349.092+0.106	G349.09+0.11	Image	Descr	1665	-86;-76	79.8 (0.01)	0.7(0.03)	3.1	2.3 (0.1)	NANCAY	0.137	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2003 Oct
	17 16 25.4	-37 59 35.8	349.0957	0.1049	G349.092+0.106	G349.09+0.11	Image		1665	-86;-76	80.2 (0.03)	0.7(0.07)	1.4	1.1 (0.1)	NANCAY	0.137	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2003 Oct
	17 16 25.4	-37 59 35.8	349.0957	0.1049	G349.092+0.106	G349.09+0.11	Image		1667	-86;-76	79.8 (0.01)	0.3 (0.03)	2.6	0.9 (0.1)	NANCAY	0.137	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2003 Oct
16	17 27 12	-35 19 36.2	352.5176	-0.1574	G352.517-0.155	G352.52-0.16	Image	Descr	1665	-56;-43	50.8 (0.01)	0.96 (0.05)	5	5.1 (0.2)	NANCAY	0.137	+H₂O +CH₃OH II +OH	SFR		2003 Oct
	17 27 12	-35 19 36.2	352.5176	-0.1574	G352.517-0.155	G352.52-0.16	Image		1667	-56;-43	51.7 (0.03)	1.0 (0.08)	1.3	1.4 (0.1)	NANCAY	0.137	+H₂O +CH₃OH II +OH	SFR		2003 Oct
	17 27 12	-35 19 36.2	352.5176	-0.1574	G352.517-0.155	G352.52-0.16	Image		1667	-56;-43	51.6 (0.02)	1.2 (0.05)	2.5	3.2 (0.1)	NANCAY	0.137	+H₂O +CH₃OH II +OH	SFR		2003 Oct
19	17 40 54.2	-30 22 38.1	358.2354	0.1149	G358.235+0.115	G358.235+0.116	Image	Descr	1665	-32;-20	26.6 (0.04)	0.5 (0.1)	0.9	0.5 (0.1)	NANCAY	0.137	+H₂O +OH +SiO	EVOLVED		2003 Oct
	17 40 54.2	-30 22 38.1	358.2354	0.1149	G358.235+0.115	G358.235+0.116	Image		1665	-32;-20	27.2 (0.05)	0.7 (0.2)	0.5	0.3 (0.1)	NANCAY	0.137	+H₂O +OH +SiO	EVOLVED		2003 Oct
	17 40 54.2	-30 22 38.1	358.2354	0.1149	G358.235+0.115	G358.235+0.116	Image		1667	-32;-20	26.7 (0.05)	0.7 (0.2)	1.4	0.9 (0.2)	NANCAY	0.137	+H₂O +OH +SiO	EVOLVED		2003 Oct
	17 40 54.2	-30 22 38.1	358.2354	0.1149	G358.235+0.115	G358.235+0.116	Image		1667	-32;-20	27.1 (0.04)	0.6 (0.1)	0.7	0.4 (0.1)	NANCAY	0.137	+H₂O +OH +SiO	EVOLVED		2003 Oct

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.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.freq) as freq,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 'BAY13' 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.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.freq,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 'BAY13' AND detected=true AND hide=false ORDER BY detected DESC,id

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BAY13 - Magnetic fields in methanol maser condensations based on data for related regions. Seven sources: Observational parameters

View as list of objects

Detection table from Bayandina et al. (2013)