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BAR12 - Milliarcsecond structure of water maser emission in two young high-mass stellar objects associated with methanol masers
Interferometry data
Short title
: Bartkiewicz et al. (2012)
Authors
: Bartkiewicz, A.Szymczak, M.van Langevelde, H. J.
Journal
: Astronomy & Astrophysics, Volume 541, id.A72,
9
pp.
Bibcode
:
2012A&A...541A..72B
Target type
: High_mass_SFR
Transitions
: H2O_22
Abstract
Context. The 22.2 GHz water masers are often associated with the 6.7 GHz methanol masers but owing to the different excitation conditions they likely probe independent spatial and kinematic regions around the powering young massive star.
Aims: We compared the emission of these two maser species on milliarcsecond scales to determine in which structures the masers arise and to test a disc-outflow scenario where the methanol emission arises in a circumstellar disc while the water emission comes from an outflow.
Methods: We obtained high-angular and spectral resolution 22.2 GHz water maser observations of the two sources G31.581+00.077 and G33.641-00.228 using the EVN.
Results: In both objects the water maser spots form complex and filamentary structures of sizes 18-160 AU. The emission towards the source G31.581 + 00.077 comes from two distinct regions of which one is related to the methanol maser source of ring-like shape. In both targets the main axis of methanol distribution is orthogonal to the water maser distribution. Most of water masers appear to trace shocks on a working surface between an outflow/jet and a dense envelope. Some spots are possibly related to the disc-wind interface which is as close as 100-150 AU to the regions of methanol emission.
The colour versions of all figures are available on-line.
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Detection table from Bartkiewicz et al. (2012)
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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
F
peak
Telescope
V
step
Beam
PA
Detection
Class
Distance
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(mJy/beam)
(km/s)
(arcsec)
(deg.)
Yes
/
No
(kpc)
(kpc)
1
+18 48 41.9411
-01 10 2.5281
31.580767
0.076993
G31.581+0.077
G31.581+00.077
Image
Descr
22 GHz
;
90.6 .. 102.9
233 .. 1333
EVN
0.1
0.001 x 0.0024
-38
+H
2
O
+CH
3
OH I
+CH
3
OH II
-OH
SFR
5.500
2010 October 30
+18 48 41.9504
-01 10 2.57142
137.78 mas
-43.02 mas
31.580774
0.076953
1
1
G31.581+00.077
102.9
1008
+18 48 41.9503
-01 10 2.57098
136.79 mas
-42.58 mas
31.580774
0.076953
2
2
G31.581+00.077
101.8
233
+18 48 41.9502
-01 10 2.56909
134.57 mas
-40.69 mas
31.580774
0.076954
3
3
G31.581+00.077
100.3
472
+18 48 41.9471
-01 10 2.59244
88.23 mas
-64.04 mas
31.580763
0.076963
4
6
G31.581+00.077
93.6
363
+18 48 41.947
-01 10 2.59237
86.79 mas
-63.97 mas
31.580763
0.076963
5
7
G31.581+00.077
91.7
1000
+18 48 41.9472
-01 10 2.59388
89.65 mas
-65.48 mas
31.580763
0.076962
6
8
G31.581+00.077
90.6
1333
2
+18 53 32.563
+00 31 39.18
33.641373
-0.227733
G33.641-0.228
G33.641-00.228
Image
22 GHz
;
54.8 .. 58.1
157 .. 263
EVN
0.1
0.001 x 0.0024
-38
+H
2
O
-CH
3
OH I
+CH
3
OH II
+OH
SFR
3.800
2010 October 30
+18 53 32.5688
+00 31 38.9086
87.77 mas
-271.39 mas
33.641317
-0.227789
1
1
G33.641-00.228
58.1
174
+18 53 32.5661
+00 31 38.9007
46.98 mas
-279.33 mas
33.641310
-0.227780
2
3
G33.641-00.228
56.3
157
+18 53 32.5662
+00 31 38.9026
48.62 mas
-277.37 mas
33.641310
-0.227780
3
4
G33.641-00.228
54.8
263
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SDSS color
IRAC color I1,I2,I4
GLIMPSE 360
PACS color (70-160 um)
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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 'BAR12' 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 'BAR12' AND detected=true AND hide=false ORDER BY detected DESC,id
