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OH
CAS01B - Maser maps and magnetic field of OH 323.459-0.079
Interferometry data
Short title
: Caswell & Reynolds (2001)
Authors
: Caswell, J. L.Reynolds, J. E.
Journal
: Monthly Notices of the Royal Astronomical Society, Volume 325, Issue 4, pp. 1346-1352.
Bibcode
:
2001MNRAS.325.1346C
PDF
:
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Target type
: High_mass_SFR
Observations category
: SF.general
Facility type
: interferometer
Transitions
: OH_1665,OH_1667
Abstract
The maser site OH 323.459-0.079 has been studied using the Long Baseline Array of the Australia Telescope National Facility. Simultaneous observations of the 1665- and 1667-MHz hydroxyl ground-state transitions yielded a series of maps at a velocity spacing of 0.18kms
-1
, in both senses of circular polarization, with tenth-arcsec spatial resolution. Many small-diameter maser spots were detected within a 2-arcsec region. Pairs of spots with the same position, but with right- and left-hand circular polarization offset in frequency, reveal Zeeman splitting. Six pairs were found, and in four cases, the pairs at 1667 and 1665MHz mutually corroborate the derived values of magnetic field and (central) kinematic velocity. Over the whole site, magnetic field estimates range from +1.47 to +4.13mG with a median value of +2.5mG. The excited state of OH at 6035MHz also displays Zeeman pairs revealing a similar magnetic field, and we show that the most prominent of these pairs coincides with the most prominent pair at 1665 and 1667MHz. We also compared the morphology and kinematics at 1665 and 1667MHz with those of maser emission from the excited state of OH at 6035MHz and from methanol at 6668MHz. All three varieties of masers appear intermingled, and associated with an ultracompact Hii region. In many respects we find that OH 323.459-0.079 is similar to W3(OH), one of the few other maser sites yet studied in comparable detail.
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Detection table from Caswell & Reynolds (2001)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
grpv
#
Source name
Image
Line
Frequency
V
peak
F
peak
Telescope
V
step
RMS
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
OH
(MHz)
(km/s)
(Jy)
(km/s)
(mJy)
Yes
/
No
(kpc)
1
+15 29 19.35
-56 31 22
323.459003
-0.078698
G323.459-0.079
G323.4591-0.0786
323.459-0.079
Image
1665 MHz
;
1665
-71.51 .. -64.91
0.15 .. 11.04
ATCA
0.18
20.000
-H
2
O
+CH
3
OH II
+OH
SFR
1998 Mar 12-13
+15 29 19.34
-56 31 22.35
-150 mas
-349.2 mas
323.458929
-0.078765
1
323.459-0.079
1665
-66.49
0.22
+15 29 19.341
-56 31 22.34
-135 mas
-339.2 mas
323.458933
-0.078764
2
323.459-0.079
1665
-64.91
0.53
+15 29 19.327
-56 31 22.32
-345 mas
-319.2 mas
323.458909
-0.078742
3
323.459-0.079
1665
-66.67
1.97
+15 29 19.329
-56 31 22.32
-315 mas
-319.2 mas
323.458913
-0.078744
4
323.459-0.079
1665
-65.39
0.46
2
+15 29 19.35
-56 31 22
323.459003
-0.078698
G323.459-0.079
G323.4591-0.0786
323.459-0.079
Image
1667 MHz
;
1667
-71.47 .. -66.11
0.16 .. 4.65
ATCA
0.18
20.000
-H
2
O
+CH
3
OH II
+OH
SFR
1998 Mar 12-13
+15 29 19.325
-56 31 22.31
-375 mas
-309.2 mas
323.458907
-0.078737
1
323.459-0.079
1667
-66.63
4.65
+15 29 19.326
-56 31 22.31
-360 mas
-309.2 mas
323.458909
-0.078738
2
323.459-0.079
1667
-66.11
1
+15 29 19.3
-56 31 21.9
-750 mas
100.8 mas
323.458924
-0.078610
3
323.459-0.079
1667
-68.43
0.17
+15 29 19.308
-56 31 21.95
-630 mas
50.8 mas
323.458931
-0.078632
4
323.459-0.079
1667
-68.6
0.36
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X
DSS colored
2MASS colored
WISE colored
PACS color (70-160 um)
SPIRE color (250-500 um)
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NVSS (1.4GHz)
ATLASGAL 870 um
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 'CAS01B' 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 'CAS01B' AND detected=true AND hide=false ORDER BY detected DESC,id
