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H
2
O
MOS00 - Tracing the root of the bipolar jet in IRAS 20126+4104: VLBA observations of H
2
O masers
Interferometry data
Short title
: Moscadelli et al. (2000)
Authors
: Moscadelli, L.Cesaroni, R.Rioja, M. J.
Journal
: Astronomy and Astrophysics, Vol. 360, p.663-670
Bibcode
:
2000A&A...360..663M
Target type
: High_mass_SFR,YSO
Transitions
: H2O_22
Abstract
We present VLBA observations of the H
2
O masers towards IRAS 20126+4104, a high-mass young stellar object which is believed to be associated with a rotating disk and a bipolar outflow/jet system collimated along the disk axis. A model fit to the positions and velocities of the maser spots demonstrates that these could arise on a conical surface at the interface between the jet and the surrounding molecular gas. The masers expand from a common centre which coincides, within the uncertainties, with the position of the embedded young stellar object: the expansion velocity is less than that measured on a much larger scale in the SiO(2-1) line and this indicates that the jet is sensitively braked close to its origin by the interaction with the surrounding medium. Based on observations carried out with the Very Large Baseline Array. The VLBA is a facility of the NRAO, which is operated by Associated Universities, Inc., under contract with the NSF.
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Detection table from Moscadelli et al. (2000)
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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
range
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)
(km/s)
(Jy/beam)
(km/s)
(mJy/beam)
(arcsec)
(deg.)
Yes
/
No
(kpc)
1
+20 14 26.0387
+41 13 32.534
78.122246
3.63281
G78.122+3.633
IRAS 20126+4104
Image
Descr
22 GHz
;
-27;16
-24.2 .. 13.6
0.03 .. 3.41
NRAOVLA
0.21
5.000
0.0012 x 0.0011
49
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997 Nov 21-22
+20 14 26.032
+41 13 32.6433
-101.988 mas
108.945 mas
78.122260
3.632844
1
IRAS 20126+4104
-24.2
0.07
+20 14 26.0308
+41 13 32.663
-120.151 mas
128.597 mas
78.122262
3.632851
2
IRAS 20126+4104
-22.7
0.06
+20 14 26.0305
+41 13 32.6594
-123.803 mas
124.979 mas
78.122261
3.632851
3
IRAS 20126+4104
-22.9
0.05
+20 14 26.0317
+41 13 32.6557
-106.58 mas
121.263 mas
78.122262
3.632847
4
IRAS 20126+4104
-23.9
0.05
+20 14 26.0387
+41 13 32.6525
-1 mas
118.05 mas
78.122273
3.632828
5
IRAS 20126+4104
-20.8
0.07
+20 14 26.0306
+41 13 32.6485
-123.174 mas
114.12 mas
78.122258
3.632849
6
IRAS 20126+4104
-20.8
0.05
+20 14 26.0322
+41 13 32.6472
-98.472 mas
112.842 mas
78.122261
3.632844
7
IRAS 20126+4104
-24.2
0.11
+20 14 26.0387
+41 13 32.6888
-1 mas
154.394 mas
78.122282
3.632834
8
IRAS 20126+4104
-8.2
0.1
+20 14 26.0316
+41 13 32.6875
-107.905 mas
153.097 mas
78.122269
3.632852
9
IRAS 20126+4104
-7.1
0.04
+20 14 26.0317
+41 13 32.6864
-106.919 mas
152.008 mas
78.122269
3.632852
10
IRAS 20126+4104
-7.9
0.96
+20 14 26.0316
+41 13 32.6859
-108.613 mas
151.513 mas
78.122269
3.632852
11
IRAS 20126+4104
-9.4
0.18
+20 14 26.0317
+41 13 32.6854
-105.754 mas
150.957 mas
78.122269
3.632852
12
IRAS 20126+4104
-7.3
3.41
+20 14 26.0314
+41 13 32.685
-110.888 mas
150.62 mas
78.122268
3.632852
13
IRAS 20126+4104
-11.9
0.2
+20 14 26.0387
+41 13 32.6835
-1 mas
149.133 mas
78.122281
3.632833
14
IRAS 20126+4104
-12.6
0.1
+20 14 26.0387
+41 13 32.624
-1 mas
89.645 mas
78.122267
3.632824
15
IRAS 20126+4104
-5.6
0.03
+20 14 26.0312
+41 13 32.619
-114.216 mas
84.56 mas
78.122253
3.632843
16
IRAS 20126+4104
-5.8
0.03
+20 14 26.0307
+41 13 32.6016
-120.844 mas
67.216 mas
78.122248
3.632841
17
IRAS 20126+4104
-6.5
0.6
+20 14 26.0311
+41 13 32.5986
-116.158 mas
64.235 mas
78.122248
3.632840
18
IRAS 20126+4104
-7.3
0.35
+20 14 26.0287
+41 13 32.5957
-151.256 mas
61.285 mas
78.122243
3.632846
19
IRAS 20126+4104
-11.9
0.04
+20 14 26.0309
+41 13 32.5956
-117.841 mas
61.2 mas
78.122247
3.632840
20
IRAS 20126+4104
2.4
0.08
+20 14 26.0388
+41 13 32.5369
0.0260001 mas
2.54 mas
78.122247
3.632810
21
IRAS 20126+4104
11
0.12
+20 14 26.0388
+41 13 32.5368
-0.457 mas
2.38 mas
78.122247
3.632810
22
IRAS 20126+4104
13.6
1.87
+20 14 26.0388
+41 13 32.5344
0 mas
0 mas
78.122246
3.632810
23
IRAS 20126+4104
13.6
2.75
+20 14 26.0389
+41 13 32.5344
0.904 mas
-0.03 mas
78.122246
3.632810
24
IRAS 20126+4104
12.3
0.53
+20 14 25.9858
+41 13 32.8771
-794.285 mas
342.709 mas
78.122234
3.633001
25
IRAS 20126+4104
-3.3
0.25
+20 14 25.9856
+41 13 32.8729
-797.65 mas
338.476 mas
78.122233
3.633001
26
IRAS 20126+4104
-3.3
0.05
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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 'MOS00' 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 'MOS00' AND detected=true AND hide=false ORDER BY detected DESC,id