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EDR05 - The masers towards IRAS 20126 + 4104

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Short title: Edris et al. (2005)
Authors: Edris, K. A.Fuller, G. A.Cohen, R. J.Etoka, S.
Journal: Astronomy and Astrophysics, Volume 434, Issue 1, April IV 2005, pp.213-220
Bibcode:

Target type: High_mass_SFR
Transitions: H2O_22

Abstract
We present MERLIN observations of OH, water and methanol masers towards the young high mass stellar object IRAS 20126+4104. Emission from the 1665-MHz OH, 22-GHz H2O and 6.7-GHz CH3OH masers is detected and all originates very close to the central source. The OH and methanol masers appear to trace part of a circumstellar disk around the central source. The positions and velocities of the OH and CH3OH masers are consistent with Keplerian rotation around a central mass of ~5 Msolar. The water masers are offset from the OH and CH3OH masers and have significantly changed since they were last observed, but still appear to be associated to the outflow from the source. All the OH masers components are circularly polarised, in some cases reaching 100 percent while some OH components also have linear polarisation. We identify one Zeeman pair of OH masers and the splitting of this pair indicates a magnetic field of strength ~11 mG within ~0.5'' (850 AU) of the central source. The OH and CH3OH maser emission suggest that the disk material is dense, n>10⁶ cm^-3, and warm, T>125 K and the high abundance of CH3OH required by the maser emission is consistent with the evaporation of the mantles on dust grains in the disk as a result of heating or shocking of the disk material.

Abstract

We present MERLIN observations of OH, water and methanol masers towards the young high mass stellar object IRAS 20126+4104. Emission from the 1665-MHz OH, 22-GHz H2O and 6.7-GHz CH3OH masers is detected and all originates very close to the central source. The OH and methanol masers appear to trace part of a circumstellar disk around the central source. The positions and velocities of the OH and CH3OH masers are consistent with Keplerian rotation around a central mass of ~5 Msolar. The water masers are offset from the OH and CH3OH masers and have significantly changed since they were last observed, but still appear to be associated to the outflow from the source. All the OH masers components are circularly polarised, in some cases reaching 100 percent while some OH components also have linear polarisation. We identify one Zeeman pair of OH masers and the splitting of this pair indicates a magnetic field of strength ~11 mG within ~0.5'' (850 AU) of the central source. The OH and CH3OH maser emission suggest that the disk material is dense, n>10⁶ cm^-3, and warm, T>125 K and the high abundance of CH3OH required by the maser emission is consistent with the evaporation of the mantles on dust grains in the disk as a result of heating or shocking of the disk material.

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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	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(Jy/beam)		(km/s)	(mJy/beam)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+20 14 26.04	+41 13 32.5			78.12224	3.632802	G78.122+3.633		IRAS 20126 + 4104	Image	Descr	22 GHz;	-9.14 .. 13.39		MERLIN	0.25	11.000	0.04 x 0.008	-37	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		28 and 29 Mar. 2002
	+20 14 26.0243	+41 13 32.575	-235.5 mas	76.6 mas	78.122230	3.632854		1	IRAS 20126 + 4104				3.51	7.79 (0.01)
	+20 14 26.0241	+41 13 32.576	-238.5 mas	77.6 mas	78.122230	3.632855		2	IRAS 20126 + 4104				2.05	4.25 (0.01)
	+20 14 26.0269	+41 13 32.588	-196.5 mas	89.6 mas	78.122238	3.632849		3	IRAS 20126 + 4104				-2.27	8.40 (0.01)
	+20 14 26.0221	+41 13 32.607	-268.5 mas	108.6 mas	78.122234	3.632865		4	IRAS 20126 + 4104				-2.36	0.56 (0.01)
	+20 14 26.0217	+41 13 32.612	-274.5 mas	113.6 mas	78.122234	3.632867		5	IRAS 20126 + 4104				-5.22	4.93 (0.01)
	+20 14 26.0219	+41 13 32.602	-271.5 mas	103.6 mas	78.122233	3.632865		6	IRAS 20126 + 4104				-7.07	78.81 (0.04)
	+20 14 26.022	+41 13 32.602	-270 mas	103.6 mas	78.122233	3.632864		7	IRAS 20126 + 4104				-9.14	8.53 (0.01)
	+20 14 26.0243	+41 13 32.667	-235.5 mas	168.6 mas	78.122252	3.632868		8	IRAS 20126 + 4104				13.39	1.20 0.01

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(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 'EDR05' 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 'EDR05' AND detected=true AND hide=false ORDER BY detected DESC,id

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EDR05 - The masers towards IRAS 20126 + 4104

Interferometry data

View as list of objects

Detection table from Edris et al. (2005)