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OH
FIS06 - A Very High Spectral Resolution Study of Ground-State OH Masers in W3(OH)
Interferometry data
Short title
: Fish et al. (2006)
Authors
: Fish, Vincent L.Brisken, Walter F.Sjouwerman, Loránt O.
Journal
: The Astrophysical Journal, Volume 647, Issue 1, pp. 418-431.
Bibcode
:
2006ApJ...647..418F
PDF
:
View
Target type
: High_mass_SFR
Observations category
: SF.general
Facility type
: interferometer
Transitions
: OH_1612,OH_1665,OH_1667,OH_1720
Abstract
We present VLBA observations of the ground-state hydroxyl masers in W3(OH) at 0.02 km s
-1
spectral resolution. Over 250 masers are detected, including 56 Zeeman pairs. Line shapes are predominantly Gaussian or combinations of several Gaussians, with normalized deviations typically of the same magnitude as in masers in other species. Typical FWHM maser line widths are 0.15-0.38 km s
-1
and are larger in the 1665 MHz transition than in the other three ground-state transitions. The satellite-line 1612 and 1720 MHz masers show no evidence of σ
+/-2,3
components. The spatial positions of most masers are seen to vary across the line profile, with many spots showing clear, organized positional gradients. Equivalent line-of-sight velocity gradients in the plane of the sky typically range from 0.01 to 1 km s
-1
AU
-1
(i.e., positional gradients of 1-100 AU [km s
-1
]
-1
). Small velocity gradients in the 1667 MHz transition support theoretical predictions that 1667 MHz masers appear in regions with small velocity shifts along the amplification length. Deconvolved maser spot sizes appear to be larger in the line wings but do not support a spherical maser geometry.
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Table (CSV)
View as list of objects
Detection table from Fish et al. (2006)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
grpv
#
Source name
Line
Frequency
V
peak
F
peak
Telescope
V
step
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
OH
(MHz)
(km/s)
(Jy/beam)
(km/s)
Yes
/
No
(kpc)
1
+02 27 4.6
+61 52 25.6
133.948665
1.06501
G133.947+1.064
G133.9475+1.0643
W3(OH)
1612 MHz
;
1612
-47.54 .. -41.53
0.14 .. 2.9
VLBA
0.02
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
2005 Sep 20
+02 27 4.64195
+61 52 23.9651
628.04 mas
-1635.73 mas
133.948906
1.064616
1
W3(OH)
1612
-47.54
0.42
+02 27 4.61662
+61 52 23.8861
248.05 mas
-1714.66 mas
133.948868
1.064578
2
W3(OH)
1612
-42.25
0.18
+02 27 4.61673
+61 52 23.8872
249.76 mas
-1713.64 mas
133.948868
1.064578
3
W3(OH)
1612
-41.53
0.44
+02 27 4.61163
+61 52 23.7796
173.32 mas
-1821.23 mas
133.948869
1.064546
4
W3(OH)
1612
-43.36
0.58
+02 27 4.6119
+61 52 23.7802
177.3 mas
-1820.6 mas
133.948870
1.064547
5
W3(OH)
1612
-42.62
1.61
2
+02 27 4.6
+61 52 25.6
133.948665
1.06501
G133.947+1.064
G133.9475+1.0643
W3(OH)
1665 MHz
;
1665
-49.08 .. -39.1
0.14 .. 92.03
VLBA
0.02
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
2005 Sep 20
+02 27 4.64668
+61 52 24.079
699.04 mas
-1521.77 mas
133.948903
1.064649
1
W3(OH)
1665
-47.71
0.26
+02 27 4.64695
+61 52 24.0345
703.12 mas
-1566.29 mas
133.948908
1.064637
2
W3(OH)
1665
-47.69
0.38
+02 27 4.648
+61 52 24.0894
718.86 mas
-1511.38 mas
133.948905
1.064652
3
W3(OH)
1665
-47.23
0.58
+02 27 4.64822
+61 52 24.092
722.13 mas
-1508.82 mas
133.948905
1.064653
4
W3(OH)
1665
-47.25
0.19
+02 27 4.60192
+61 52 25.6315
27.6 mas
30.66 mas
133.948666
1.065019
5
W3(OH)
1665
-45.12
2.45
+02 27 4.60196
+61 52 23.8813
28.17 mas
-1719.46 mas
133.948841
1.064566
6
W3(OH)
1665
-42.4
0.74
+02 27 4.60199
+61 52 25.9955
28.6 mas
394.66 mas
133.948629
1.065114
7
W3(OH)
1665
-48.99
2.05
+02 27 4.60204
+61 52 25.5798
29.39 mas
-21.02 mas
133.948671
1.065006
8
W3(OH)
1665
-41.1
0.74
+02 27 4.60206
+61 52 25.6367
29.66 mas
35.9 mas
133.948665
1.065021
9
W3(OH)
1665
-41.06
20.4
+02 27 4.60211
+61 52 25.5693
30.42 mas
-31.54 mas
133.948672
1.065003
10
W3(OH)
1665
-40.73
1.35
+02 27 4.60215
+61 52 25.6491
31.03 mas
48.26 mas
133.948664
1.065024
11
W3(OH)
1665
-41.43
2.01
+02 27 4.60263
+61 52 23.8765
38.31 mas
-1724.34 mas
133.948843
1.064565
12
W3(OH)
1665
-42.07
0.9
+02 27 4.60281
+61 52 25.9802
41 mas
379.37 mas
133.948632
1.065110
13
W3(OH)
1665
-48.59
0.58
+02 27 4.60299
+61 52 25.9777
43.67 mas
376.91 mas
133.948633
1.065110
14
W3(OH)
1665
-48.55
0.79
+02 27 4.60323
+61 52 23.8727
47.24 mas
-1728.08 mas
133.948844
1.064565
15
W3(OH)
1665
-41.69
3.16
+02 27 4.60325
+61 52 25.9817
47.62 mas
380.95 mas
133.948633
1.065111
16
W3(OH)
1665
-45.32
0.52
+02 27 4.5398
+61 52 25.7058
-904.18 mas
104.96 mas
133.948544
1.064994
17
W3(OH)
1665
-45.01
87.25
+02 27 4.53982
+61 52 25.7073
-903.84 mas
106.5 mas
133.948544
1.064995
18
W3(OH)
1665
-44.92
86.66
+02 27 4.53985
+61 52 25.7232
-903.43 mas
122.38 mas
133.948543
1.064999
19
W3(OH)
1665
-45.16
81.34
+02 27 4.53987
+61 52 25.6442
-903.21 mas
43.38 mas
133.948551
1.064979
20
W3(OH)
1665
-47.1
8.78
+02 27 4.5402
+61 52 25.6702
-898.25 mas
69.41 mas
133.948549
1.064986
21
W3(OH)
1665
-47.91
0.23
+02 27 4.54022
+61 52 25.6437
-897.89 mas
42.91 mas
133.948551
1.064979
22
W3(OH)
1665
-43.82
0.41
+02 27 4.54029
+61 52 25.6484
-896.86 mas
47.56 mas
133.948551
1.064980
23
W3(OH)
1665
-44.13
0.53
+02 27 4.54041
+61 52 23.9392
-895.04 mas
-1661.62 mas
133.948723
1.064537
24
W3(OH)
1665
-42.7
0.3
+02 27 4.54047
+61 52 25.6729
-894.15 mas
72.11 mas
133.948549
1.064986
25
W3(OH)
1665
-44.22
2.25
+02 27 4.54068
+61 52 23.9279
-891.01 mas
-1672.87 mas
133.948724
1.064535
26
W3(OH)
1665
-42.31
0.4
+02 27 4.54076
+61 52 25.009
-889.81 mas
-591.76 mas
133.948616
1.064815
27
W3(OH)
1665
-44.44
2.66
+02 27 4.5414
+61 52 25.6676
-880.24 mas
66.78 mas
133.948551
1.064986
28
W3(OH)
1665
-47.12
1.41
+02 27 4.54247
+61 52 24.9796
-864.21 mas
-621.18 mas
133.948622
1.064808
29
W3(OH)
1665
-44.15
1.55
3
+02 27 4.6
+61 52 25.6
133.948665
1.06501
G133.947+1.064
G133.9475+1.0643
W3(OH)
1667 MHz
;
1667
-47.8 .. -41.94
0.22 .. 21.32
VLBA
0.02
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
2005 Sep 20
+02 27 4.59741
+61 52 24.1556
-40.06 mas
-1445.19 mas
133.948805
1.064634
1
W3(OH)
1667
-45.25
0.27
+02 27 4.59528
+61 52 23.5781
-72.03 mas
-2022.71 mas
133.948859
1.064483
2
W3(OH)
1667
-47.8
1.54
+02 27 4.5742
+61 52 23.7174
-388.2 mas
-1883.45 mas
133.948807
1.064504
3
W3(OH)
1667
-44.28
21.32
+02 27 4.57425
+61 52 23.7224
-387.38 mas
-1878.44 mas
133.948806
1.064505
4
W3(OH)
1667
-44.26
5.39
+02 27 4.56343
+61 52 23.8367
-549.71 mas
-1764.13 mas
133.948775
1.064527
5
W3(OH)
1667
-44.59
0.69
+02 27 4.56377
+61 52 23.854
-544.63 mas
-1746.85 mas
133.948774
1.064532
6
W3(OH)
1667
-45.87
1.02
4
+02 27 4.6
+61 52 25.6
133.948665
1.06501
G133.947+1.064
G133.9475+1.0643
W3(OH)
1720 MHz
;
1720
-45.64 .. -42.72
0.17 .. 14.63
VLBA
0.02
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
2005 Sep 20
+02 27 4.60182
+61 52 25.6516
26.16 mas
50.8 mas
133.948664
1.065024
1
W3(OH)
1720
-42.72
7.52
+02 27 4.60184
+61 52 25.6519
26.36 mas
51.12 mas
133.948664
1.065024
2
W3(OH)
1720
-43.49
3.81
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WISE colored
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NVSS (1.4GHz)
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ATLASGAL 870 um + Planck
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select MAX(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.grpv) as grpv,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.line) as line,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.pol) as pol,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_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 oh_data_all LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line" WHERE ref ilike 'FIS06' AND detected=true AND hide=false GROUP BY ref
select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.grpv,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.line,oh_data_all.freq,oh_data_all.pol,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line" WHERE ref ilike 'FIS06' AND detected=true AND hide=false ORDER BY detected DESC,id
