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ASA10C - OH and H₂O masers towards the star-forming region S140-IRS1

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Short title: Asanok et al. (2010)
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.
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1665

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. (2010)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	grpv	#	Source name	Image	Line	Frequency	V_peak	F_peak	Telescope	V_step	RMS	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						OH	(MHz)	(km/s)	(Jy/beam)		(km/s)	(Jy/beam)	Yes/No		(kpc)
1	+22 19 18.218	+63 18 46.779			106.79674	5.312004	G106.797+5.312	G106.7968+5.3121		S140-IRS1	Image	1665 MHz;	1665	-10.02 .. -4.58	0.19 .. 5.09	MERLIN	0.09	7.000	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2005 May 5-10
	+22 19 18.1089	+63 18 48.7964	-1635 mas	2018 mas	106.796879	5.312584			1	S140-IRS1			1665	-4.58	0.7
	+22 19 18.1103	+63 18 48.7964	-1614 mas	2018 mas	106.796881	5.312583			2	S140-IRS1			1665	-5.68	1.31
	+22 19 18.1097	+63 18 48.7934	-1624 mas	2015 mas	106.796880	5.312583			3	S140-IRS1			1665	-7.35	4.58
	+22 19 18.1088	+63 18 48.7954	-1637 mas	2017 mas	106.796879	5.312584			4	S140-IRS1			1665	-7.78	5.09
	+22 19 18.109	+63 18 48.7964	-1634 mas	2018 mas	106.796879	5.312584			5	S140-IRS1			1665	-8.38	4.36
	+22 19 18.0732	+63 18 48.0884	-2171 mas	1310 mas	106.796714	5.312457			6	S140-IRS1			1665	-5.56	0.45
	+22 19 18.1089	+63 18 48.7884	-1636 mas	2010 mas	106.796878	5.312583			7	S140-IRS1			1665	-7.74	0.32
	+22 19 18.1086	+63 18 48.7924	-1640 mas	2014 mas	106.796878	5.312584			8	S140-IRS1			1665	-8.16	0.21
	+22 19 18.1101	+63 18 48.7904	-1618 mas	2012 mas	106.796880	5.312582			9	S140-IRS1			1665	-8.72	0.69
	+22 19 18.0707	+63 18 48.0884	-2208 mas	1310 mas	106.796711	5.312460			10	S140-IRS1			1665	-8.56	0.23
	+22 19 18.0714	+63 18 48.0884	-2198 mas	1310 mas	106.796712	5.312459			11	S140-IRS1			1665	-9.18	3.98
	+22 19 18.0733	+63 18 48.0874	-2169 mas	1309 mas	106.796714	5.312457			12	S140-IRS1			1665	-9.65	0.24
	+22 19 18.0721	+63 18 48.0814	-2187 mas	1303 mas	106.796712	5.312457			13	S140-IRS1			1665	-10.02	0.19

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

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 'ASA10C' 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 'ASA10C' AND detected=true AND hide=false ORDER BY detected DESC,id

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ASA10C - OH and H2O masers towards the star-forming region S140-IRS1

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Detection table from Asanok et al. (2010)

ASA10C - OH and H₂O masers towards the star-forming region S140-IRS1