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GOD06B - Tracing the base of protostellar wind(s) towards the high-mass star forming region AFGL 5142: VLA continuum and VLBA H2O maser observations
Interferometry data
Short title
: Goddi & Moscadelli (2006B)
Authors
: Goddi, C.Moscadelli, L.
Journal
: Astronomy and Astrophysics, Volume 447, Issue 2, February IV 2006, pp.577-587
Bibcode
:
2006A&A...447..577G
Target type
: High_mass_SFR
Transitions
: H2O_22
Abstract
We have conducted phase-reference multi-epoch observations of the 22.2 GHz water masers using the Very Long Baseline Array (VLBA) and a multi-frequency study of the continuum emission using the Very Large Array (VLA) towards the high-mass star forming region (SFR) AFGL 5142. 29 maser features were identified and most of them were persistent over the four observing epochs, allowing absolute proper motions to be determined. The water maser emission comes from two elongated structures (indicated as Group I and Group II), with the measured proper motions aligned along the structures' elongation axes. Each group consists of two (blue- and red-shifted) clusters of features separated by a few hundreds and thousands of AU respectively for Group I and Group II. The maser features of Group II have both positions and velocities aligned along a direction close to the axis of the outflow traced by HCO+ and SiO emission on angular scales of tens of arcsec. We predict that the maser emission arises from dense, shocked molecular clumps displaced along the axis of the molecular outflow. The two maser clusters of Group I are oriented on the sky along a direction forming a large angle (>≈ 60°) with the axis of the jet/outflow traced by Group II maser features. We have detected a compact (8.4 and 22 GHz) continuum source (previously reported at 4.9 and 8.4 GHz) that falls close to the centroid of Group I masers, indicating that the source ionizing the gas is also responsible for the excitation of the water masers. The kinematic analysis indicates that the Group I masers trace outflowing rather than rotating gas, discarding the Keplerian disk scenario proposed in a previous paper for Group I. Since the axis joining the two maser clusters of Group II does not cross the position of the continuum source, Group II masers might be excited by an (undetected) massive YSO, distinct from the one (pinpointed by the VLA continuum emission) responsible for the excitation of the Group I masers. Our results give support to models of accretion and jet ejection related to the formation of high-mass stars.
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Detection table from Goddi & Moscadelli (2006B)
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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
V
X
V
Y
F
peak
Telescope
Configuration
V
step
RMS
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(km/s)
(km/s)
(Jy)
(km/s)
(mJy/beam)
(arcsec)
Yes
/
No
(kpc)
1
+05 30 48.033
+33 47 54.6
174.200808
-0.070527
G174.198-0.077
AFGL 5142
Image
Descr
22 GHz
;
-7.8 .. 4.6
0.1 .. 33.2
NRAOVLA
B
0.2
40.000
0.0007 x 0.0004
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
GALAXY
2003 Oct 16 - 2004 Feb 08
+05 30 48.0273
+33 47 54.3563
-84.3 mas
-243.7 mas
174.200854
-0.070581
1
AFGL 5142
-5
0.8 (11)
-11(7)
33.2
+05 30 48.0289
+33 47 54.3571
-59.6 mas
-242.9 mas
174.200856
-0.070576
2
AFGL 5142
-5.7
14 (14)
-15 (7)
7.1
+05 30 48.0201
+33 47 54.3208
-191.1 mas
-279.2 mas
174.200848
-0.070607
3
AFGL 5142
-6.3
-9(13)
16 (7)
5.3
+05 30 48.0284
+33 47 54.3622
-66.6 mas
-237.8 mas
174.200854
-0.070576
4
AFGL 5142
-7.8
5(14)
-11(7)
1.1
+05 30 48.029
+33 47 54.3579
-57.9 mas
-242.1 mas
174.200856
-0.070575
5
AFGL 5142
-4.4
0.1
+05 30 48.0163
+33 47 54.7055
-248.1 mas
105.5 mas
174.200752
-0.070559
6
AFGL 5142
-3.1
-9(13)
8 (7)
0.6
+05 30 48.0277
+33 47 54.8423
-77.8 mas
242.3 mas
174.200742
-0.070505
7
AFGL 5142
-2.7
8(13)
-10(7)
1.1
+05 30 48.0172
+33 47 54.6
-234.7 mas
0 mas
174.200778
-0.070573
8
AFGL 5142
0.1
-9(13)
2(7)
0.5
+05 30 48.0173
+33 47 54.5996
-233.2 mas
-0.4 mas
174.200778
-0.070572
9
AFGL 5142
-0.2
-6(13)
4(7)
0.6
+05 30 48.0204
+33 47 54.5738
-186.7 mas
-26.2 mas
174.200790
-0.070567
10
AFGL 5142
-1.4
-26 (16)
9(8)
0.5
+05 30 48.0207
+33 47 54.5726
-182.8 mas
-27.4 mas
174.200791
-0.070567
11
AFGL 5142
-2.2
0.9 (13)
9(7)
0.3
+05 30 48.0129
+33 47 54.6435
-299.9 mas
43.5 mas
174.200760
-0.070578
12
AFGL 5142
-1.3
-13 (13)
5(7)
5.2
+05 30 48.016
+33 47 54.6921
-253.9 mas
92.1 mas
174.200754
-0.070562
13
AFGL 5142
-1.7
-7(13)
6(7)
0.7
+05 30 48.0135
+33 47 54.576
-290 mas
-24 mas
174.200776
-0.070587
14
AFGL 5142
-1.9
0.3
+05 30 48.0141
+33 47 54.501
-281.9 mas
-99 mas
174.200795
-0.070597
15
AFGL 5142
-1.7
-6(14)
-5(7)
0.5
+05 30 48.0215
+33 47 54.4301
-171.4 mas
-169.9 mas
174.200825
-0.070586
16
AFGL 5142
4.6
-18 (14)
4(7)
0.9
+05 30 48.0181
+33 47 54.604
-222.4 mas
4 mas
174.200779
-0.070570
17
AFGL 5142
1.9
-0.3 (16)
11 (8)
0.5
+05 30 48.0127
+33 47 54.607
-303.2 mas
7 mas
174.200768
-0.070585
18
AFGL 5142
-2
-12 (13)
-2 (20)
0.1
+05 30 48.0206
+33 47 54.574
-184.5 mas
-26 mas
174.200790
-0.070567
19
AFGL 5142
-1.3
-18 (13)
16 (7)
0.2
+05 30 48.0135
+33 47 54.5942
-291 mas
-5.8 mas
174.200772
-0.070584
20
AFGL 5142
0
-26 (17)
5 (9)
0.3
+05 30 48.0135
+33 47 54.58
-290.1 mas
-19.96 mas
174.200775
-0.070586
21
AFGL 5142
1.8
0.1
+05 30 48.0168
+33 47 54.7183
-241.4 mas
118.3 mas
174.200750
-0.070556
22
AFGL 5142
1.3
-5.0(17)
3 (9)
0.1
+05 30 48.0168
+33 47 54.7189
-240.6 mas
118.9 mas
174.200750
-0.070556
23
AFGL 5142
-0.6
0.1
+05 30 48.0462
+33 47 54.6892
199.8 mas
89.2 mas
174.200812
-0.070475
24
AFGL 5142
-0.1
22 (14)
11 (7)
0.7
+05 30 48.046
+33 47 54.6906
197.4 mas
90.6 mas
174.200812
-0.070475
25
AFGL 5142
0.9
6(13)
19 (7)
0.1
+05 30 48.0016
+33 47 53.0121
-469.2 mas
-1587.9 mas
174.201117
-0.070860
26
AFGL 5142
-7.4
6.6
+05 30 48.0029
+33 47 53.119
-450 mas
-1481 mas
174.201094
-0.070840
27
AFGL 5142
4.1
0.5
+05 30 47.9714
+33 47 52.7866
-921.5 mas
-1813.4 mas
174.201112
-0.070982
28
AFGL 5142
-5.7
-17(14)
-16 (7)
4.9
+05 30 47.9714
+33 47 52.7871
-921.6 mas
-1812.9 mas
174.201111
-0.070982
29
AFGL 5142
-4.2
-27 (13)
-18(7)
0.7
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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 'GOD06B' 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 'GOD06B' AND detected=true AND hide=false ORDER BY detected DESC,id
