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H
2
O
SUR11B - The properties and polarization of the H
2
O and CH
3
OH maser environment of NGC 7538-IRS 1
Interferometry data
Short title
: Surcis et al. (2011B)
Authors
: Surcis, G.Vlemmings, W. H. T.Torres, R. M.van Langevelde, H. J.Hutawarakorn Kramer, B.
Journal
: Astronomy & Astrophysics, Volume 533, id.A47,
13
pp.
Bibcode
:
2011A&A...533A..47S
Target type
: High_mass_SFR
Abstract
Context. NGC 7538 is a complex massive star-forming region. The region is composed of several radio continuum sources, one of which is IRS 1, a high-mass protostar, from which a 0.3 pc molecular bipolar outflow was detected. Several maser species have been detected around IRS 1. The CH
3
OH masers have been suggested to trace a Keplerian-disk, while the H
2
O masers are almost aligned to the outflow. More recent results suggested that the region hosts a torus and potentially a disk, but with a different inclination than the Keplerian-disk that is supposed to be traced by the CH
3
OH masers.
Aims: Tracing the magnetic field close to protostars is fundamental for determining the orientation of the disk/torus. Recent studies showed that during the protostellar phase of high-mass star formation the magnetic field is oriented along the outflows and around or on the surfaces of the disk/torus. The observations of polarized maser emissions at milliarcsecond resolution can make a crucial contribution to understanding the orientation of the magnetic field and, consequently, the orientation of the disk/torus in NGC 7538-IRS 1.
Methods: 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 NGC 7538-IRS 1. The European VLBI Network and the MERLIN telescopes were used to measure the linear polarization and the Zeeman-splitting of the 6.7 GHz CH
3
OH masers toward the same region.
Results: We detected 17 H
2
O masers and 49 CH
3
OH masers at high angular resolution. We detected linear polarization emission toward two H
2
O masers and toward twenty CH
3
OH masers. The CH
3
OH masers, most of which only show a core structure, seem to trace rotating and potentially infalling gas in the inner part of a torus. Significant Zeeman-splitting was measured in three CH
3
OH masers. No significant (3σ) magnetic field strength was measured using the H
2
O masers. We also propose a new description of the structure of the NGC 7538-IRS 1 maser region.
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Detection table from Surcis et al. (2011B)
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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
Detection
Type
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(Jy/beam)
(km/s)
(mJy/beam)
(arcsec)
Yes
/
No
(kpc)
1
+23 13 45.36
+61 28 10.5
111.542124
0.776926
G111.542+0.769
NGC 7538-IRS 1
Image
Descr
22 GHz
-73.3 .. -43.3
0.13 .. 36.43
VLBA
0.1
7.300
0.001 x 0.0004
+H
2
O
SFR
2005 Nov 21
+23 13 45.3477
+61 28 10.6407
-185.213 mas
141.908 mas
111.542116
0.776971
1
NGC 7538-IRS 1
-57.8
17.11 (0.07)
+23 13 45.3482
+61 28 10.6382
-176.468 mas
139.422 mas
111.542116
0.776970
2
NGC 7538-IRS 1
-58.3
1.00 (0.02)
+23 13 45.3486
+61 28 10.6379
-170.974 mas
139.088 mas
111.542117
0.776969
3
NGC 7538-IRS 1
-58.3
0.48 (0.02)
+23 13 45.3562
+61 28 9.4277
-57.6929 mas
-1071.1 mas
111.542007
0.776651
4
NGC 7538-IRS 1
-72.2
0.90 (0.01)
+23 13 45.3562
+61 28 9.44225
-57.447 mas
-1056.55 mas
111.542009
0.776655
5
NGC 7538-IRS 1
-57.3
0.48 (0.01)
+23 13 45.3562
+61 28 9.44217
-57.3376 mas
-1056.63 mas
111.542009
0.776655
6
NGC 7538-IRS 1
-70.3
36.43 (0.02)
+23 13 45.3562
+61 28 9.44173
-57.1463 mas
-1057.07 mas
111.542009
0.776655
7
NGC 7538-IRS 1
-73.3
16.99 (0.01)
+23 13 45.3562
+61 28 9.44221
-56.7637 mas
-1056.59 mas
111.542009
0.776655
8
NGC 7538-IRS 1
-67.3
0.15 (0.01)
+23 13 45.3562
+61 28 9.42872
-56.4631 mas
-1070.08 mas
111.542008
0.776652
9
NGC 7538-IRS 1
-71.6
0.48 (0.01)
+23 13 45.36
+61 28 10.4988
0 mas
0 mas
111.542124
0.776925
10
NGC 7538-IRS 1
-60.6
7.34 (0.03)
+23 13 45.3657
+61 28 10.4028
85.5692 mas
-96.002 mas
111.542125
0.776896
11
NGC 7538-IRS 1
-59.7
0.36 (0.02)
+23 13 45.3673
+61 28 10.4853
110.002 mas
-13.538 mas
111.542136
0.776916
12
NGC 7538-IRS 1
-60.2
0.20 (0.03)
+23 13 45.3674
+61 28 10.3993
111.669 mas
-99.499 mas
111.542128
0.776894
13
NGC 7538-IRS 1
-60.1
9.31 (0.03)
+23 13 45.3675
+61 28 10.3423
112.844 mas
-156.492 mas
111.542122
0.776879
14
NGC 7538-IRS 1
-60.1
0.25 (0.03)
+23 13 45.3701
+61 28 10.4088
151.98 mas
-90.046 mas
111.542133
0.776895
15
NGC 7538-IRS 1
-59.9
1.04 (0.03)
+23 13 45.3761
+61 28 10.6477
242.004 mas
148.947 mas
111.542169
0.776952
16
NGC 7538-IRS 1
-43.3
0.13 (0.01)
+23 13 45.3762
+61 28 10.6485
242.769 mas
149.715 mas
111.542169
0.776952
17
NGC 7538-IRS 1
-43.8
0.14(0.01)
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DSS colored
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WISE colored
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.image) as image,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 'SUR11B' 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.image,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 'SUR11B' AND detected=true AND hide=false ORDER BY detected DESC,id
