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ASH16 - Investigation of OH and H₂O masers in the star-forming region G 188.946+0.886

Short title: Ashimbaeva et al. (2016)
Authors: Ashimbaeva, N. T.Colom, P.Lekht, E. E.Pashchenko, M. I.Rudnitskii, G. M.Tolmachev, A. M.
Journal: Astronomy Letters, Volume 42, Issue 10, pp.652-664
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: single-dish
Transitions: OH_1665,OH_1667,OH_1720

Abstract
We present the results of our observations of the maser radio emission source G 188.946+0.886 in hydroxyl (OH) molecular lines with the radio telescope of the Nancay Observatory (France) and in the H2O line at A = 1.35 cm with the RT-22 radio telescope at the Pushchino Observatory (Russia). An emission feature in the 1720-MHz satellite line of the OH ground state has been detected for the first time. The radial velocity of the feature, VLSr = 3.6 km s-1, has a �blue� shift relative to the range of emission velocities in the main 1665- and 1667-MHz OH lines, which is 8�11 km s-1. This suggests a probable connection of the observed feature in the 1720-MHz line with the �blue� wing of the bipolar outflow observed in this region in the CO line. We have estimated the magnetic field strength for three features (0.90 and 0.8 mG for 1665 MHz and 0.25 mG for 1720 MHz) from the Zeeman splitting in the 1665- and 1720-MHz lines. No emission and (or) absorption has been detected in the other 1612-MHz satellite OH line. Three cycles of H2O maser activity have been revealed. The variability is quasi-periodic in pattern. There is a general tendency for the maser activity to decrease. Some clusters of H2O maser spots can form organized structures, for example, chains and other forms.

Abstract

We present the results of our observations of the maser radio emission source G 188.946+0.886 in hydroxyl (OH) molecular lines with the radio telescope of the Nancay Observatory (France) and in the H2O line at A = 1.35 cm with the RT-22 radio telescope at the Pushchino Observatory (Russia). An emission feature in the 1720-MHz satellite line of the OH ground state has been detected for the first time. The radial velocity of the feature, VLSr = 3.6 km s-1, has a �blue� shift relative to the range of emission velocities in the main 1665- and 1667-MHz OH lines, which is 8�11 km s-1. This suggests a probable connection of the observed feature in the 1720-MHz line with the �blue� wing of the bipolar outflow observed in this region in the CO line. We have estimated the magnetic field strength for three features (0.90 and 0.8 mG for 1665 MHz and 0.25 mG for 1720 MHz) from the Zeeman splitting in the 1665- and 1720-MHz lines. No emission and (or) absorption has been detected in the other 1612-MHz satellite OH line. Three cycles of H2O maser activity have been revealed. The variability is quasi-periodic in pattern. There is a general tendency for the maser activity to decrease. Some clusters of H2O maser spots can form organized structures, for example, chains and other forms.

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Detection table from Ashimbaeva et al. (2016)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Image	Line	Frequency	Polarization	Telescope	V_step	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					OH	(MHz)			(km/s)	(Jy)	(arcsec)	Yes/No		(kpc)
1	06 08 53.4	+21 38 28.9	188.9463	0.8862	G188.946+0.887	G188.9463+0.8874	G188.946+0.886	Image	1665 MHz;	1665	LR	Nancay	0.07	0.200	210 x 999	+OH	SFR_MIXED		2011 Dec 5 - 2015 Dec 1
2	06 08 53.4	+21 38 28.9	188.9463	0.8862	G188.946+0.887	G188.9463+0.8874	G188.946+0.886	Image	1667 MHz;	1667	LR	Nancay	0.07	0.200	210 x 999	+OH	SFR_MIXED		2011 Dec 5 - 2015 Dec 1
3	06 08 53.4	+21 38 28.9	188.9463	0.8862	G188.946+0.887	G188.9463+0.8874	G188.946+0.886	Image	1720 MHz;	1720	LR	Nancay	0.07	0.200	210 x 999	+OH	SFR_MIXED		2011 Dec 5 - 2015 Dec 1

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 'ASH16' 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 'ASH16' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

ASH16 - Investigation of OH and H2O masers in the star-forming region G 188.946+0.886

View as list of objects

Detection table from Ashimbaeva et al. (2016)

ASH16 - Investigation of OH and H₂O masers in the star-forming region G 188.946+0.886