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OH
ASH23B - Investigation of the OH Maser Emission at 18 cm and Magnetic Field in the S128 Star Formation Region
Short title
: Ashimbaeva et al. (2023B)
Authors
: Ashimbaeva, N. T.Lekht, E. E.Krasnov, V. V.Tolmachev, A. M.
Journal
: Astronomy Reports, Volume 67, Issue 7, p.697-706
Bibcode
:
2023ARep...67..697A
PDF
:
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Target type
: High_mass_SFR
Observations category
: variability
Facility type
: single-dish
Transitions
: OH_1612,OH_1665,OH_1667,OH_1720
Abstract
The results of a study of the variability of OH maser emission in the lines at 18 cm in the S128 star formation region from monitoring data in 2007-2022 with the Large Radio Telescope in Nançay (France) are presented. Maser emission was observed in the main line at 1665 MHz during the entire monitoring, and only short-term emission was observed in the satellite lines at 1612 and 1720 MHz. For the four strongest features in the 1665 MHz line, the variability of the positional angle $χ $ of linearly polarized emission was found. The dependence of the angle $χ $ on the radial velocity to some extent resembles a limited sinusoid, which may be due to the existence of an organized spatial structure of OH maser spots and the associated transverse magnetic field. For two Zeeman pairs in the 1612 MHz line having similar radial velocities (-75.344/-75.236 and -74.980/-74.903 km/s), the detected splits have opposite signs and, therefore, opposite directions of the longitudinal magnetic field. The directions of the transverse magnetic field vectors are also determined for these features. Apparently, the magnetic field is swirling and is associated with a swirling molecular outflows of matter.
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Table (CSV)
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Detection table from Ashimbaeva et al. (2023B)
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individual components
ID
Obs. RA
Obs. Dec
l
b
Group id
grpv
Source name
Other name
Line
Frequency
V
peak
F
peak
Telescope
Beam
Detection
Dist. (parallax)
Date
(J2000)
(J2000)
(deg.)
(deg.)
Feature ID
OH
(MHz)
(km/s)
(Jy)
(arcsec)
Yes
/
No
(kpc)
1
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1665_-73.6
1665 MHz
;
1665
-73.6
1.2
Nancay
999
+OH
08.04.2021
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1665_-73.1
1665 MHz
;
1665
-73.1
1.5
Nancay
999
+OH
08.04.2021
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1665_-72.15
1665 MHz
;
1665
-72.15
1
Nancay
999
+OH
08.04.2021
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1665_-70.95
1665 MHz
;
1665
-70.95
1.3
Nancay
999
+OH
08.04.2021
5
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1612_-76.40
1612 MHz
;
1612
-76.4
0.8
Nancay
999
+OH
16.03.2018
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1612_Z1_C1
1612 MHz
;
1612
-75.344
1.5
Nancay
999
+OH
16.03.2018
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1612_Z1_C2
1612 MHz
;
1612
-75.236
1.5
Nancay
999
+OH
16.03.2018
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1612_Z2_C1
1612 MHz
;
1612
-74.98
1
Nancay
999
+OH
16.03.2018
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1612_Z2_C2
1612 MHz
;
1612
-74.903
1
Nancay
999
+OH
16.03.2018
10
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1720_Z1_C1
1720 MHz
;
1720
-70.16
1.2
Nancay
999
+OH
09.08.2012
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1720_Z1_C2
1720 MHz
;
1720
-69.96
1.2
Nancay
999
+OH
09.08.2012
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1720_Z2_C1
1720 MHz
;
1720
-67.56
0.8
Nancay
999
+OH
19.11.2014
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_1720_Z2_C2
1720 MHz
;
1720
-67.3
0.8
Nancay
999
+OH
19.11.2014
Non-detection table from Ashimbaeva et al. (2023B)
Export table to csv
Hide
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Show
individual components
ID
Obs. RA
Obs. Dec
l
b
Group id
grpv
Source name
Other name
Line
Frequency
F
peak
Telescope
Beam
Detection
Date
(J2000)
(J2000)
(deg.)
(deg.)
Feature ID
OH
(MHz)
(Jy)
(arcsec)
Yes
/
No
1
21 32 15
+55 53 30
97.5313
3.1756
G97.527+3.180
G97.5313+3.1756
S128
S128_ND_1667
1667 MHz
;
1667
<0.1
Nancay
999
+OH
2007-2022
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X
DSS colored
2MASS colored
WISE colored
PACS color (70-160 um)
SPIRE color (250-500 um)
GLIMPSE 360
SDSS color
IRAC color I1,I2,I4
NVSS (1.4GHz)
ATLASGAL 870 um
ATLASGAL 870 um + Planck
Bolocam 1.1 mm
UKIDSS K
Download UKIDSS K FITS
2MASS K
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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.vi) as vi,MAX(oh_data_all.var_type) as var_type,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 'ASH23B' 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.vi,oh_data_all.var_type,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 'ASH23B' AND detected=true AND hide=false ORDER BY detected DESC,id
