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EDR05 - The masers towards IRAS 20126 + 4104
Interferometry data
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
:
2005A&A...434..213E
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>10
6
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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Detection table from Edris et al. (2005)
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individual components
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.)
H
2
O
(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
+H
2
O
+CH
3
OH I
+CH
3
OH 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
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GLIMPSE 360
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NVSS (1.4GHz)
ATLASGAL 870 um
ATLASGAL 870 um + Planck
Bolocam 1.1 mm
UKIDSS K
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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