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OH
EDR17 - OH masers towards IRAS 19092+0841
Interferometry data
Short title
: Edris et al. (2017)
Authors
: Edris, K. A.Fuller, G. A.Etoka, S.Cohen, R. J.
Journal
: Astronomy & Astrophysics, Volume 608, id.A80,
6
pp.
Bibcode
:
2017A&A...608A..80E
PDF
:
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Target type
: High_mass_SFR
Observations category
: polarization
Facility type
: interferometer
Transitions
: OH_1665,OH_1667
Abstract
Context. Maser emission is a strong tool for studying high-mass star-forming regions and their evolutionary stages. OH masers in particular can trace the circumstellar material around protostars and determine their magnetic field strengths at milliarcsecond resolution.
Aims: We seek to image OH maser emission towards high-mass protostellar objects to determine their evolutionary stages and to locate the detected maser emission in the process of high-mass star formation.
Methods: In 2007, we surveyed OH maser emission towards 217 high-mass protostellar objects to study its presence. In this paper, we present follow-up MERLIN observations of a ground-state OH maser emission towards one of these objects, IRAS 19092+0841.
Results: We detect emissions from the two OH main spectral lines, 1665 and 1667 MHz, close to the central object. We determine the positions and velocities of the OH maser features. The masers are distributed over a region of 5'' corresponding to 22 400 AU (or 0.1 pc) at a distance of 4.48 kpc. The polarization properties of the OH maser features are determined as well. We identify three Zeeman pairs from which we inferred a magnetic field strength of 4.4 mG pointing towards the observer.
Conclusions: The relatively small velocity spread and relatively wide spacial distribution of the OH maser features support the suggestion that this object could be in an early evolutionary state before the presence of disk, jets or outflows.
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Detection table from Edris et al. (2017)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
grpv
#
Source name
Image
Descr.
Line
Frequency
V
peak
F
peak
Telescope
RMS
Beam
PA
Detection
Class
Distance
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
OH
(MHz)
(km/s)
(Jy/beam)
(Jy/beam)
(arcsec)
(deg.)
Yes
/
No
(kpc)
(kpc)
1
+19 11 37.4
+08 46 30
43.034829
-0.447258
G43.038-0.453
G43.0348-0.4473
IRAS 19092
Image
Descr
1665 MHz
;
1665
57.98 .. 60.7
0.05 .. 1.53
MERLIN
14.000
0.9 x 0.4
-31
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
4.480
4 and 5 April 2003
+19 11 39.002
+08 46 30.38
24031.2 mas
380 mas
43.037975
-0.453058
1
IRAS 19092
1665
60.65
0.17
+19 11 38.973
+08 46 31.1
23596.2 mas
1100 mas
43.038097
-0.452860
2
IRAS 19092
1665
60.59
0.77
+19 11 38.899
+08 46 28.33
22486.2 mas
-1670 mas
43.037274
-0.452945
3
IRAS 19092
1665
60.7
0.05
+19 11 38.943
+08 46 27.68
23146.2 mas
-2320 mas
43.037197
-0.453190
4
IRAS 19092
1665
60.58
0.18
+19 11 38.909
+08 46 44.8
22636.2 mas
14800 mas
43.041349
-0.450865
5
IRAS 19092
1665
60.5
0.1
+19 11 39.001
+08 46 30.44
24016.2 mas
440 mas
43.037988
-0.453047
6
IRAS 19092
1665
57.98
0.48
+19 11 38.974
+08 46 31.09
23611.2 mas
1090 mas
43.038096
-0.452865
7
IRAS 19092
1665
58.08
1.53
+19 11 38.941
+08 46 27.95
23116.2 mas
-2050 mas
43.037260
-0.453148
8
IRAS 19092
1665
58.07
0.14
+19 11 38.95
+08 46 27.59
23251.2 mas
-2410 mas
43.037189
-0.453227
9
IRAS 19092
1665
58.09
0.25
2
+19 11 37.4
+08 46 30
43.034829
-0.447258
G43.038-0.453
G43.0348-0.4473
IRAS 19092
1667 MHz
;
1667
60.55 .. 60.67
0.4 .. 0.48
MERLIN
14.000
0.9 x 0.4
-31
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
4.480
4 and 5 April 2003
+19 11 38.95
+08 46 27.81
23251.2 mas
-2190 mas
43.037243
-0.453198
1
IRAS 19092
1667
60.67
0.48
+19 11 38.944
+08 46 27.66
23161.2 mas
-2340 mas
43.037194
-0.453196
2
IRAS 19092
1667
60.55
0.4
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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 'EDR17' 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 'EDR17' AND detected=true AND hide=false ORDER BY detected DESC,id
