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H
2
O
SUR14 - The magnetic field at milliarcsecond resolution around
IRAS 20126+4104
Interferometry data
Short title
: Surcis et al. (2014)
Authors
: Surcis, G.Vlemmings, W. H. T.van Langevelde, H. J.Moscadelli, L.Hutawarakorn Kramer, B.
Journal
: Astronomy & Astrophysics, Volume 563, id.A30,
8
pp.
Bibcode
:
2014A&A...563A..30S
Target type
: High_mass_SFR
Abstract
Context. IRAS 20126+4104 is a well studied B0.5 protostar that is surrounded by a ~1000 au Keplerian disk and is where a large-scale outflow originates. Both 6.7-GHz CH
3
OH masers and 22-GHz H
2
O masers have been detected toward this young stellar object. The CH
3
OH masers trace the Keplerian disk, while the H
2
O masers are associated with the surface of the conical jet. Recently, observations of dust polarized emission (350 μm) at an angular resolution of 9 arcsec (~15 000 au) have revealed an S-shaped morphology of the magnetic field around IRAS 20126+4104.
Aims: The observations of polarized maser emissions at milliarcsecond resolution (~20 au) can make a crucial contribution to understanding the orientation of the magnetic field close to IRAS 20126+4104. This will allow us to determine whether the magnetic field morphology changes from arcsecond resolution to milliarcsecond resolution.
Methods: The European VLBI Network was used to measure the linear polarization and the Zeeman splitting of the 6.7-GHz CH
3
OH masers toward IRAS 20126+4104. The NRAO Very Long Baseline Array was used to measure the linear polarization and the Zeeman splitting of the 22-GHz H
2
O masers toward the same region.
Results: We detected 26 CH
3
OH masers and 5 H
2
O masers at high angular resolution. Linear polarization emission was observed toward three CH
3
OH masers and toward one H
2
O maser. Significant Zeeman splitting was measured in one CH
3
OH maser (ΔV
Z
= -9.2 ± 1.4 m s
-1
). No significant (5σ) magnetic field strength was measured using the H
2
O masers. We found that in IRAS 20126+4104 the rotational energy is less than the magnetic energy.
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Detection table from Surcis et al. (2014)
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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
F
peak
Telescope
V
step
RMS
Beam
PA
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(Jy/beam)
(km/s)
(mJy/beam)
(arcsec)
(deg.)
Yes
/
No
(kpc)
1
+20 14 25.966
+41 13 32.738
78.122167
3.633031
G78.122+3.633
IRAS 20126+4104
Image
Descr
22 GHz
;
-15.51 .. -2.05
0.19 .. 24.77
VLBA
0.003
20.000
0.00075 x 0.00034
-9.4
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
2012 Jun 24
+20 14 25.966
+41 13 32.7389
-0.818 mas
-0.656 mas
78.122167
3.633032
1
IRAS 20126+4104
-2.05
0.37 (0.05)
+20 14 25.9661
+41 13 32.7396
0 mas
0 mas
78.122168
3.633031
2
IRAS 20126+4104
-4.61
24.77 (0.06)
+20 14 25.993
+41 13 32.5276
403.317 mas
-212.02 mas
78.122165
3.632929
3
IRAS 20126+4104
-5.61
0.19 (0.04)
+20 14 25.993
+41 13 32.5271
403.898 mas
-212.452 mas
78.122165
3.632929
4
IRAS 20126+4104
-6.23
0.39 (0.05)
+20 14 26.0023
+41 13 32.5381
542.648 mas
-201.458 mas
78.122184
3.632906
5
IRAS 20126+4104
-15.51
0.23 (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 'SUR14' 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 'SUR14' AND detected=true AND hide=false ORDER BY detected DESC,id
