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H
2
O
SAR02 - Magnetic Fields in Shocked Regions: Very Large Array Observations of H
2
O Masers
Interferometry data
Short title
: Sarma et al. (2002)
Authors
: Sarma, A. P.Troland, T. H.Crutcher, R. M.Roberts, D. A.
Journal
: The Astrophysical Journal, Volume 580, Issue 2, pp. 928-937.
Bibcode
:
2002ApJ...580..928S
Target type
: High_mass_SFR
Transitions
: H2O_22
Abstract
We present VLA observations of the Zeeman effect in 22 GHz H
2
O masers in several high-mass star-forming regions. These masers are believed to arise from collisional pumping in postshock environments. Therefore, the Zeeman effect data provide the most direct measurements of magnetic field strengths in high-density (n>~10
8
cm
-3
) postshock gas, where the field energy determines other physical conditions. Our observations yield significant magnetic field detections in W3 IRS 5, W3(OH), W49 N, and OH 43.8-0.1. In these sources, we detect line-of-sight field strengths ranging from 13 to 49 mG. For some regions, the detected fields provide a 2-3 point sampling of the magnetic field, indicating the nature of field variations on arcsecond scales. These field strengths are consistent with a shock-driven maser model having relatively low speed (20 km s
-1
), C-type shocks. We examine the balance between magnetic field energy and turbulent kinetic energy in the masing regions. These energies appear close to equilibrium.
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Detection table from Sarma et al. (2002)
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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
Configuration
V
step
RMS
Beam
PA
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(Jy)
(km/s)
(mJy/beam)
(arcsec)
(deg.)
Yes
/
No
(kpc)
1
+02 25 40.7635
+62 05 52.643
133.715119
1.215518
G133.715+1.215
W3 IRS 5
Image
Descr
22 GHz
;
-41.2 .. -40
332.7 .. 557.2
NRAOVLA
A
0.08
20.000
0.11 x 0.09
32.7
+H
2
O
-CH
3
OH I
+CH
3
OH II
+OH
SFR
1998 May 11 - 1999 Jul 29
+02 25 40.7635
+62 05 52.6416
0 mas
0 mas
133.715119
1.215517
1
W3 IRS 5
-40
432.7
+02 25 40.7722
+62 05 52.7916
130 mas
150 mas
133.715120
1.215562
2
W3 IRS 5
-40.2
332.7
+02 25 40.7702
+62 05 53.0416
100 mas
400 mas
133.715092
1.215626
3
W3 IRS 5
-41.2
557.2
2
+02 27 4.88854
+61 52 24.5283
133.949301
1.064937
G133.949+1.064
W3 (OH)
Image
Descr
22 GHz
;
-49.1
3795.7
NRAOVLA
A
0.08
40.000
0.1 x 0.09
-16.3
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1998 May 11 - 1999 Jul 29
+02 27 4.88856
+61 52 24.528
0 mas
0 mas
133.949302
1.064937
1
W3 (OH)
-49.1
3795.7
3
+19 10 13.4058
+09 06 13.0499
43.166459
0.011211
G43.167+0.011
W49 N
Image
Descr
22 GHz
;
-72.7 .. -0.71
595.4 .. 6967
NRAOVLA
A
0.08
35.000
0.11 x 0.09
20.4
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR_MIXED
1998 May 11 - 1999 Jul 29
+19 10 13.4059
+09 06 13.05
0 mas
0 mas
43.166459
0.011210
1
W49 N
-72.7
6967
+19 10 13.4526
+09 06 13.55
700 mas
500 mas
43.166671
0.011104
2
W49 N
-0.71
851
4
+17 47 20.4231
-28 23 41.2547
0.658642
-0.041226
G0.6573-0.0413
Sgr B2 S
Descr
22 GHz
;
66.1
1164
NRAOVLA
A
0.08
80.000
0.21 x 0.13
-1.7
+H
2
O
+CH
3
OH II
+OH
SFR
1998 May 11 - 1999 Jul 29
+17 47 20.423
-28 23 41.2548
0 mas
0 mas
0.658642
-0.041226
1
Sgr B2 S
66.1
1164
5
+22 56 17.9333
+62 01 46.3447
109.87054
2.113529
G109.871+2.114
Cep A
Descr
22 GHz
;
-8.8
2494
NRAOVLA
A
0.08
50.000
0.13 x 0.09
60.7
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1998 May 11 - 1999 Jul 29
+22 56 17.8406
+62 01 48.894
-1390 mas
2550 mas
109.870680
2.114246
1
Cep A
-8.8
2494
6
+19 11 54.0672
+09 35 50.3664
43.795555
-0.127525
G43.795-0.127
OH 43.8-0.1
Image
Descr
22 GHz
;
36.5
1133.9
NRAOVLA
A
0.08
40.000
0.12 x 0.09
30.7
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1998 May 11 - 1999 Jul 29
+19 11 54.0672
+09 35 50.3664
0 mas
0 mas
43.795555
-0.127525
1
OH 43.8-0.1
36.5
1133.9
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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 'SAR02' 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 'SAR02' AND detected=true AND hide=false ORDER BY detected DESC,id
