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ASA10B - OH and H₂O masers towards the star-forming region S140-IRS1

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Short title: Asanok et al. (2010B)
Authors: Asanok, K.Etoka, S.Gray, M. D.Thomasson, P.Richards, A. M. S.Kramer, B. Hutawarakorn
Journal: Monthly Notices of the Royal Astronomical Society, Volume 404, Issue 1, pp. 120-133.
Bibcode:

Target type: High_mass_SFR

Abstract
Multi-Element Radio-Linked Interferometer Network polarization measurements of the OH 1.7- and 6.0-GHz, and the H₂O 22-GHz masers in the massive star-forming region S140-IRS1 are presented. The observations were taken with astrometric accuracy of 15-30 mas. OH maser emission has been detected only in the ground-state 1665-MHz line. The OH masers are located approximately 2.5 arcsec north-west of IRS1. They lie in two distinct regions separated by approximately 1 arcsec along a north-east/south-west axis. Analysis of the OH maser polarization yields a magnetic field of B = 5.2-6.9mG, directed towards us. The polarization position angles attest to a magnetic field which is preferentially orientated along the direction of the CO outflow associated with IRS1. The brightest H₂O masers coincide in position with IRS1 and show a gradient of increasing Doppler velocity from north-west to south-east. These water masers also have proper motions of ~18kms^-1 in a similar direction. The closest OH and H₂O masers are separated by more than 2 arcsec. H₂O masers have also been detected at several locations up to ~0.5arcmin distance, where masers have not previously been reported. The relationships between our maser observations, the central engine/object of IRS1 and the multiple outflows detected by observations at other wavelengths are also discussed.

Abstract

Multi-Element Radio-Linked Interferometer Network polarization measurements of the OH 1.7- and 6.0-GHz, and the H₂O 22-GHz masers in the massive star-forming region S140-IRS1 are presented. The observations were taken with astrometric accuracy of 15-30 mas. OH maser emission has been detected only in the ground-state 1665-MHz line. The OH masers are located approximately 2.5 arcsec north-west of IRS1. They lie in two distinct regions separated by approximately 1 arcsec along a north-east/south-west axis. Analysis of the OH maser polarization yields a magnetic field of B = 5.2-6.9mG, directed towards us. The polarization position angles attest to a magnetic field which is preferentially orientated along the direction of the CO outflow associated with IRS1. The brightest H₂O masers coincide in position with IRS1 and show a gradient of increasing Doppler velocity from north-west to south-east. These water masers also have proper motions of ~18kms^-1 in a similar direction. The closest OH and H₂O masers are separated by more than 2 arcsec. H₂O masers have also been detected at several locations up to ~0.5arcmin distance, where masers have not previously been reported. The relationships between our maser observations, the central engine/object of IRS1 and the multiple outflows detected by observations at other wavelengths are also discussed.

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Detection table from Asanok et al. (2010B)

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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	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(Jy)		(km/s)	(mJy/beam)	Yes/No		(kpc)
1	+22 19 18.218	+63 18 46.779			106.79674	5.312004	G106.797+5.312		S140	Image	Descr	22 GHz;	-18.6 .. 10.2	0.19 .. 314.9	MERLIN	0.21	21.000	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1998 Jan 24 - 2004 Apr 23
	+22 19 18.2261	+63 18 47.0254	122.1 mas	247 mas	106.796791	5.312053		1	S140				10.2	25.79
	+22 19 18.2261	+63 18 47.0264	122.4 mas	248 mas	106.796791	5.312053		2	S140				6.6	8.05
	+22 19 18.2251	+63 18 47.0436	107.2 mas	265.2 mas	106.796792	5.312058		3	S140				4.8	6.39
	+22 19 18.1812	+63 18 46.8034	-550.8 mas	25 mas	106.796686	5.312048		4	S140				-12.8	0.28
	+22 19 18.1925	+63 18 46.8767	-381.1 mas	98.3 mas	106.796715	5.312053		5	S140				-15.5	2.44
	+22 19 18.2183	+63 18 47.082	5 mas	303.6 mas	106.796787	5.312074		6	S140				-18.1	0.19
	+22 19 16.5471	+63 19 0.8014	-25062 mas	14023 mas	106.796274	5.316977		7	S140				-15.4	0.78
	+22 19 16.5473	+63 19 0.8014	-25060 mas	14023 mas	106.796274	5.316977		8	S140				-17.6	8.22
	+22 19 17.2693	+63 18 39.1184	-14229 mas	-7660 mas	106.794075	5.311206		9	S140				2.7	3.21
	+22 19 17.2723	+63 18 39.1864	-14185 mas	-7592 mas	106.794090	5.311219		10	S140				-2.3	1.46
	+22 19 17.2729	+63 18 39.1744	-14175 mas	-7604 mas	106.794089	5.311215		11	S140				-4	6.47
	+22 19 17.2707	+63 18 39.1414	-14209 mas	-7637 mas	106.794081	5.311210		12	S140				-2.4	0.58
	+22 19 17.2695	+63 18 39.1164	-14227 mas	-7662 mas	106.794075	5.311205		13	S140				-4	0.25
	+22 19 17.2672	+63 18 39.0604	-14261 mas	-7718 mas	106.794063	5.311195		14	S140				-14.6	0.57
	+22 19 17.267	+63 18 39.0604	-14264 mas	-7718 mas	106.794063	5.311195		15	S140				-17.1	16.74
	+22 19 17.2649	+63 18 39.0504	-14295 mas	-7728 mas	106.794058	5.311195		16	S140				-17.9	0.75
	+22 19 18.2275	+63 18 47.0009	143.99 mas	222.53 mas	106.796789	5.312046		17	S140				7.1	2.13
	+22 19 18.2256	+63 18 47.0156	115.05 mas	237.2 mas	106.796789	5.312051		18	S140				2.9	314.9
	+22 19 18.2231	+63 18 47.0351	78.16 mas	256.66 mas	106.796788	5.312058		19	S140				3.8	310.7
	+22 19 18.2223	+63 18 47.0402	66.14 mas	261.75 mas	106.796787	5.312060		20	S140				-1.3	0.52
	+22 19 18.1928	+63 18 46.8665	-377.44 mas	88.05 mas	106.796714	5.312050		21	S140				-15.1	21.29
	+22 19 18.2202	+63 18 47.0702	33.72 mas	291.78 mas	106.796789	5.312069		22	S140				-18.6	0.98
	+22 19 17.275	+63 18 39.1986	-14144.5 mas	-7579.8 mas	106.794096	5.311219		23	S140				-1.9	1.02
	+22 19 17.265	+63 18 39.0254	-14293.6 mas	-7753 mas	106.794054	5.311189		24	S140				-13.2	22.54
	+22 19 17.9518	+63 18 48.6956	-3991.5 mas	1917.2 mas	106.796617	5.312723		25	S140				-15.3	5.44

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 'ASA10B' 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 'ASA10B' AND detected=true AND hide=false ORDER BY detected DESC,id

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ASA10B - OH and H2O masers towards the star-forming region S140-IRS1

Interferometry data

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Detection table from Asanok et al. (2010B)

ASA10B - OH and H₂O masers towards the star-forming region S140-IRS1