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H
2
O
GOD05 - Kinematics of H
2
O masers in high-mass star forming regions
Interferometry data
Short title
: Goddi et al. (2005)
Authors
: Goddi, C.Moscadelli, L.Alef, W.Tarchi, A.Brand, J.Pani, M.
Journal
: Astronomy and Astrophysics, Volume 432, Issue 1, March II 2005, pp.161-173
Bibcode
:
2005A&A...432..161G
Target type
: High_mass_SFR
Transitions
: H2O_22
Abstract
We have conducted multi-epoch EVN observations of the 22.2 GHz water masers towards four high-mass star forming regions (Sh 2-255 IR, IRAS 23139+5939, WB89-234, and OMC2). The (three) observing epochs span 6 months. In each region, the H2O maser emission likely originates close (within a few hundred AU) to a forming high-mass YSO. Several maser features (~10) have been detected for each source and, for those features persistent over the three epochs, proper motions have been derived. The amplitudes of the proper motions are found to be larger than the range of variation of the line-of-sight velocities and in each of the observed sources the proper motion orientation seems to indicate expansion. The gas kinematics traced by the 22.2 GHz H2O masers is compatible with the shock-excited nature of water maser emission. Three different kinematic models (a spherical expanding shell, a Keplerian rotating disk and a conical outflow) were fitted to the 3-dimensional velocity field of the detected maser features. The results of these fits, together with the comparison of the VLBI maps with the highest-resolution images of the sources in several thermal tracers, suggest that the water maser features most likely trace the inner portion of the molecular outflows detected at much larger scales.
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Detection table from Goddi et al. (2005)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
#
Maser spot
Source name
Image
Descr.
Line
V
peak
V
X
V
Y
F
peak
Telescope
RMS
Beam
PA
Detection
Class
Distance
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(km/s)
(km/s)
(Jy/beam)
(Jy/beam)
(arcsec)
(deg.)
Yes
/
No
(kpc)
(kpc)
1
+06 12 54.0159
+17 59 23.0081
192.600322
-0.04804
G192.599-0.048
Sh 2-255 IR
Image
Descr
22 GHz
;
11.8
78.5
EVN
0.600
0.0028 x 0.0012
50.6
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR_MIXED
2.500
1997 Sep.
+06 12 54.006
+17 59 22.9057
-147.8 mas
-100.69 mas
192.600328
-0.048088
1
1
Sh 2-255 IR
11.6
8(7)
-30(5)
51.9
+06 12 54.0159
+17 59 23.0057
1.4 mas
-0.71 mas
192.600323
-0.048040
2
2
Sh 2-255 IR
7.3
5 (6)
-11(3)
24.7
+06 12 54.016
+17 59 23.0068
2.77 mas
0.39 mas
192.600323
-0.048039
3
3
Sh 2-255 IR
9.9
2.6
+06 12 54.02
+17 59 23.0155
63.1 mas
9.09 mas
192.600328
-0.048024
4
4
Sh 2-255 IR
5.6
7(11)
-14(9)
5
+06 12 54.0065
+17 59 22.9163
-140 mas
-90.1 mas
192.600327
-0.048084
5
5
Sh 2-255 IR
12.9
14 (15)
-41 (12)
2.4
+06 12 54.0147
+17 59 22.928
-16.7 mas
-78.4 mas
192.600339
-0.048054
6
6
Sh 2-255 IR
10.5
2.5
+06 12 54.0159
+17 59 23.0072
1.5 mas
0.8 mas
192.600322
-0.048039
7
7
Sh 2-255 IR
10.7
2.4
+06 12 54.0059
+17 59 22.9042
-149.2 mas
-102.2 mas
192.600328
-0.048088
8
8
Sh 2-255 IR
12.5
5(7)
-35 (8)
11.5
+06 12 54.0158
+17 59 23.0064
0 mas
0 mas
192.600322
-0.048040
9
9
Sh 2-255 IR
9.1
13.9
+06 12 54.0164
+17 59 23.008
8.5 mas
1.6 mas
192.600323
-0.048038
10
10
Sh 2-255 IR
6.7
4.9
+06 12 54.007
+17 59 22.8254
-132.8 mas
-181 mas
192.600350
-0.048095
11
11
Sh 2-255 IR
5.8
0.6
+06 12 54.0068
+17 59 22.8256
-135.6 mas
-180.75 mas
192.600349
-0.048095
12
12
Sh 2-255 IR
6.4
4
+06 12 54.0213
+17 59 23.0248
81.3 mas
18.4 mas
192.600328
-0.048019
13
13
Sh 2-255 IR
7.1
2.5
+06 12 54.0053
+17 59 22.8188
-158.3 mas
-187.61 mas
192.600348
-0.048102
14
14
Sh 2-255 IR
8.5
2.7
2
+23 16 10.3396
+59 55 28.8118
111.255664
-0.769702
G111.255-0.770
IRAS 23139+5939
Image
Descr
22 GHz
;
-53.3
247
EVN
4.000
0.0023 x 0.0016
-41.4
+H
2
O
+CH
3
OH I
+CH
3
OH II
-OH
SFR
4.800
1997 Sep.
+23 16 10.3393
+59 55 28.8145
-2.81 mas
2.45 mas
111.255663
-0.769701
1
1
IRAS 23139+5939
-53.2
-13 (15)
11 (9)
199.6
+23 16 10.3394
+59 55 28.812
0 mas
0 mas
111.255664
-0.769702
2
2
IRAS 23139+5939
-54.7
7.1
+23 16 10.3383
+59 55 28.8118
-16.82 mas
-0.24 mas
111.255661
-0.769701
3
3
IRAS 23139+5939
-50.5
-40 (14)
17(18)
4.6
+23 16 10.335
+59 55 28.5854
-67.3 mas
-226.6 mas
111.255632
-0.769757
4
4
IRAS 23139+5939
-52.9
97(17)
-57(21)
4.8
+23 16 10.3292
+59 55 28.6286
-153.78 mas
-183.4 mas
111.255625
-0.769742
5
5
IRAS 23139+5939
-46.6
4.2
+23 16 10.3387
+59 55 28.7913
-11.7 mas
-20.7 mas
111.255660
-0.769707
6
6
IRAS 23139+5939
-46.7
1.2
+23 16 10.3404
+59 55 28.7938
14.2 mas
-18.2 mas
111.255664
-0.769708
7
7
IRAS 23139+5939
-47.3
0.9
+23 16 10.3392
+59 55 28.8136
-3.7 mas
1.6 mas
111.255663
-0.769701
8
8
IRAS 23139+5939
-57.7
0.7
+23 16 10.3411
+59 55 28.906
24.49 mas
94 mas
111.255676
-0.769679
9
9
IRAS 23139+5939
-46.6
0.8
3
+23 02 32.0546
+56 57 51.7118
108.471383
-2.81818
G108.471-2.818
WB89-234
Image
Descr
22 GHz
;
-51.1
15
EVN
0.300
0.0015 x 0.0007
42.1
+H
2
O
-CH
3
OH I
-CH
3
OH II
SFR
5.800
1997 Sep.
+23 02 32.0609
+56 57 51.7286
94.29 mas
18.21 mas
108.471398
-2.818182
1
1
WB89-234
-51
11 (4)
-20(5)
30.4
+23 02 32.0546
+56 57 51.7104
0 mas
0 mas
108.471383
-2.818180
2
2
WB89-234
-54.9
6.6
+23 02 32.055
+56 57 51.6949
5.35 mas
-15.46 mas
108.471382
-2.818185
3
3
WB89-234
-55.9
10 (5)
-31 (2)
4.7
+23 02 32.0568
+56 57 51.7195
32.42 mas
9.11 mas
108.471389
-2.818180
4
4
WB89-234
-50.1
34 (16)
-37(5)
4.6
+23 02 32.0549
+56 57 51.694
3.6 mas
-16.41 mas
108.471382
-2.818185
5
5
WB89-234
-57
0.2 (25)
-65 (8)
4
+23 02 32.0538
+56 57 51.6971
-12.04 mas
-13.32 mas
108.471380
-2.818183
6
6
WB89-234
-56
2.1
+23 02 32.055
+56 57 51.6933
5.4 mas
-17.15 mas
108.471382
-2.818185
7
7
WB89-234
-58.4
1.4
+23 02 32.055
+56 57 51.7307
5.88 mas
20.31 mas
108.471386
-2.818176
8
8
WB89-234
-55.9
3.8
+23 02 32.055
+56 57 51.7286
5.06 mas
18.24 mas
108.471386
-2.818176
9
9
WB89-234
-52.4
1.6
+23 02 32.0545
+56 57 51.7733
-1.69 mas
62.94 mas
108.471390
-2.818164
10
10
WB89-234
-53.8
1.5
+23 02 32.0546
+56 57 51.7008
-1.19 mas
-9.65 mas
108.471382
-2.818183
11
11
WB89-234
-53.7
1.4
+23 02 32.0576
+56 57 51.7241
44.44 mas
13.73 mas
108.471391
-2.818180
12
12
WB89-234
-60.4
1.6
4
+05 35 27.6253
-05 09 34.3008
208.815512
-19.238533
G208.816-19.239
OMC2
Image
Descr
22 GHz
;
18
70
EVN
0.900
0.0029 x 0.0014
43.9
+H
2
O
+CH
3
OH I
+CH
3
OH II
SFR_MIXED
0.480
1997 Sep.
+05 35 27.6254
-05 09 34.3008
0 mas
0 mas
208.815513
-19.238532
1
1
OMC2
17.6
115.5
+05 35 27.637
-05 09 34.2115
172.7 mas
89.29 mas
208.815512
-19.238478
2
2
OMC2
11.9
2.3
+05 35 27.636
-05 09 34.2256
158.5 mas
75.2 mas
208.815514
-19.238484
3
3
OMC2
8.5
12 (3)
13(3)
2.3
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ATLASGAL 870 um
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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 'GOD05' 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 'GOD05' AND detected=true AND hide=false ORDER BY detected DESC,id