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H
2
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MOS05 - Water masers in the massive protostar IRAS 20126+4104: ejection and deceleration
Interferometry data
Short title
: Moscadelli et al. (2005)
Authors
: Moscadelli, L.Cesaroni, R.Rioja, M. J.
Journal
: Astronomy and Astrophysics, Volume 438, Issue 3, August II 2005, pp.889-898
Bibcode
:
2005A&A...438..889M
Target type
: High_mass_SFR,YSO
Transitions
: H2O_22
Abstract
We report on the first multi-epoch, phase referenced VLBI observations of the H2O maser emission in a high-mass protostar associated with a disk-jet system. The source under study, IRAS 20126+4104, has been extensively investigated in a large variety of tracers, including H2O maser VLBA data acquired by us three years before the present observations. The new findings fully confirm the interpretation proposed in our previous study, namely that the maser spots are expanding from a common origin coincident with the protostar. We also demonstrate that the observed 3-D velocities of the maser spots can be fitted with a model assuming that the spots are moving along the surface of a conical jet, with speed increasing for increasing distance from the cone vertex. We also present the results of single-dish monitoring of the H2O maser spectra in IRAS 20126+4104. These reveal that the peak velocity of some maser lines decreases linearly with time. We speculate that such a deceleration could be due to braking of the shocks from which the maser emission originates, due to mass loading at the shock front or dissipation of the shock energy.
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Detection table from Moscadelli 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
range
V
peak
V
X
V
Y
F
peak
Telescope
V
step
RMS
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(km/s)
(km/s)
(km/s)
(Jy)
(km/s)
(mJy/beam)
(arcsec)
Yes
/
No
(kpc)
1
+20 14 26.0253
+41 13 32.666
78.122253
3.632865
G78.122+3.633
IRAS 20126+4104
Image
Descr
22 GHz
;
-32;10
-24.9 .. 2.7
0.06 .. 24.3
EVN
0.21
13.000
0.0008 x 0.0006
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
2000 Nov 9 - 2001 Mar 1
+20 14 26.0254
+41 13 32.6676
0 mas
0 mas
78.122254
3.632866
1
IRAS 20126+4104
-15
-84
54
24.3
+20 14 26.0253
+41 13 32.6681
-1 mas
0.5 mas
78.122254
3.632866
2
IRAS 20126+4104
-15.3
18.36
+20 14 26.0252
+41 13 32.6688
-2.3 mas
1.2 mas
78.122254
3.632866
3
IRAS 20126+4104
-16.2
10.94
+20 14 26.0253
+41 13 32.6684
-1.6 mas
0.8 mas
78.122254
3.632866
4
IRAS 20126+4104
-16
5.12
+20 14 26.0237
+41 13 32.6161
-24.5 mas
-51.5 mas
78.122239
3.632862
5
IRAS 20126+4104
-2.3
-48
25
4.5
+20 14 26.0239
+41 13 32.6018
-21.5 mas
-65.8 mas
78.122236
3.632859
6
IRAS 20126+4104
-3.3
-66
14
5.58
+20 14 26.024
+41 13 32.601
-21.1 mas
-66.6 mas
78.122236
3.632859
7
IRAS 20126+4104
-5.1
-58
14
0.92
+20 14 26.0238
+41 13 32.6046
-22.9 mas
-63 mas
78.122236
3.632860
8
IRAS 20126+4104
-5.8
-52
19
0.47
+20 14 26.0235
+41 13 32.6072
-28 mas
-60.4 mas
78.122236
3.632861
9
IRAS 20126+4104
-8.5
-55
17
5.77
+20 14 26.0236
+41 13 32.606
-25.8 mas
-61.6 mas
78.122236
3.632861
10
IRAS 20126+4104
-9.5
-53
4
2.97
+20 14 26.0236
+41 13 32.6067
-26 mas
-60.9 mas
78.122237
3.632861
11
IRAS 20126+4104
-8.6
-52
16
2.08
+20 14 26.0247
+41 13 32.6677
-9.2 mas
0.1 mas
78.122253
3.632867
12
IRAS 20126+4104
-14.8
-76
56
0.29
+20 14 26.0262
+41 13 32.5838
12.3 mas
-83.8 mas
78.122236
3.632851
13
IRAS 20126+4104
-5.6
-42
7
0.24
+20 14 26.0261
+41 13 32.5827
11.7 mas
-84.9 mas
78.122235
3.632850
14
IRAS 20126+4104
-3.7
-44
17
0.08
+20 14 26.0263
+41 13 32.692
14.8 mas
24.4 mas
78.122261
3.632867
15
IRAS 20126+4104
-8
-28
18
0.49
+20 14 26.016
+41 13 32.7406
-141 mas
73 mas
78.122254
3.632901
16
IRAS 20126+4104
-24.9
-85
46
0.85
+20 14 26.0159
+41 13 32.7408
-142 mas
73.2 mas
78.122254
3.632901
17
IRAS 20126+4104
-24.8
0.09
+20 14 26.0242
+41 13 32.6006
-17.8 mas
-67 mas
78.122236
3.632858
18
IRAS 20126+4104
-9.5
-70
12
0.17
+20 14 26.0241
+41 13 32.6012
-19 mas
-66.4 mas
78.122236
3.632859
19
IRAS 20126+4104
-7.9
-59
9
0.14
+20 14 26.0255
+41 13 32.6669
2.1 mas
-0.7 mas
78.122254
3.632865
20
IRAS 20126+4104
-14.2
-76
83
0.13
+20 14 26.0258
+41 13 32.6972
6.4 mas
29.6 mas
78.122261
3.632869
21
IRAS 20126+4104
-8
0.12
+20 14 26.0274
+41 13 32.5905
29.9 mas
-77.1 mas
78.122239
3.632849
22
IRAS 20126+4104
-3.8
0.16
+20 14 26.0273
+41 13 32.5894
28.9 mas
-78.2 mas
78.122239
3.632849
23
IRAS 20126+4104
-3.8
0.13
+20 14 26.0268
+41 13 32.5804
21.3 mas
-87.2 mas
78.122236
3.632848
24
IRAS 20126+4104
2.7
0.06
+20 14 26.0272
+41 13 32.5896
28.2 mas
-78 mas
78.122239
3.632849
25
IRAS 20126+4104
-3.8
0.1
+20 14 26.0575
+41 13 32.4393
482.7 mas
-228.3 mas
78.122256
3.632746
26
IRAS 20126+4104
-1.9
-2
-11
1.06
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NVSS (1.4GHz)
ATLASGAL 870 um
ATLASGAL 870 um + Planck
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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 'MOS05' 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 'MOS05' AND detected=true AND hide=false ORDER BY detected DESC,id
