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ASH23C - Investigation of the Magnetic Field from Observations of the OH Maser in the G10.624-0.385 Star Formation Region

Short title: Ashimbaeva et al. (2023C)
Authors: Ashimbaeva, N. T.Lekht, E. E.Krasnov, V. V.Tolmachev, A. M.
Journal: Astronomy Reports, Volume 67, Issue 7, p.707-718
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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 maser emission in OH lines in the 18 cm range in the G10.624-0.385 star formation region from monitoring data performed at the Large Radio Telescope in NanÃ�ay (France) in 2008-2023 are presented. It is obtained that for a Zeeman pair in line 1667 MHz splitting (about 1.96 km/s) and, consequently, the magnitude of the longitudinal magnetic field have been stable for more than 25 years. In the satellite lines of 1612 and 1720 MHz, broadband absorption and emission are observed, respectively. The mirrored profiles of the OH 1612 and 1720 MHz satellite lines indicate that the levels of the corresponding transitions are pumped by IR radiation from a source immersed in a magnetized molecular cloud around the OH maser. Spatial identification of features in both main lines is carried out. It is found that the transverse magnetic field is directed mainly along some organized structure in the form of an arc.

Abstract

The results of a study of the variability of maser emission in OH lines in the 18 cm range in the G10.624-0.385 star formation region from monitoring data performed at the Large Radio Telescope in NanÃ�ay (France) in 2008-2023 are presented. It is obtained that for a Zeeman pair in line 1667 MHz splitting (about 1.96 km/s) and, consequently, the magnitude of the longitudinal magnetic field have been stable for more than 25 years. In the satellite lines of 1612 and 1720 MHz, broadband absorption and emission are observed, respectively. The mirrored profiles of the OH 1612 and 1720 MHz satellite lines indicate that the levels of the corresponding transitions are pumped by IR radiation from a source immersed in a magnetized molecular cloud around the OH maser. Spatial identification of features in both main lines is carried out. It is found that the transverse magnetic field is directed mainly along some organized structure in the form of an arc.

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Detection table from Ashimbaeva et al. (2023C)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Other name	Line	Frequency	Polarization	V_peak	F_peak	Telescope	Beam	Detection	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)				Feature	OH	(MHz)		(km/s)	(Jy)		(arcsec)	Yes/No	(kpc)
1	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	1	1665 MHz;	1665	RC	-2.83	1.8	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	-2.83	1.8	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	2	1665 MHz;	1665	RC	-2.33	81	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	-2.33	81	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	3	1665 MHz;	1665	RC	-1.93	15.8	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	-1.9	15.8	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	4	1665 MHz;	1665	RC	-1.23	2.9	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	-1.23	2.9	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	5	1665 MHz;	1665	RC/LC	-1.13	2.9	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	6	1665 MHz;	1665	RC	-0.5	30.7	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	-0.44	30.7	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	7	1665 MHz;	1665	RC	0.0	7.6	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	0.02	7.6	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	8	1665 MHz;	1665	RC	0.35	5.6	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	0.31	5.6	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	9	1665 MHz;	1665	RC	0.77	2.2	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	0.74	2.2	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	10	1665 MHz;	1665	RC	1.23	1.3	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	1.23	1.3	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	11	1665 MHz;	1665	RC	2.84	1.3	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	2.84	1.3	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385	12	1665 MHz;	1665	RC	3.2	0.49	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023
	18 10 29	-19 55 50	10.6240	-0.3849	G10.624-0.384	G10.6239-0.3838	G10.624-0.385		1665 MHz;	1665	LC	3.2	0.49	Nancay	3.5 x 19	+CH₃OH I +OH		2008-2023

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 Download 2MASS K FITS

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 'ASH23C' 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 'ASH23C' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

ASH23C - Investigation of the Magnetic Field from Observations of the OH Maser in the G10.624-0.385 Star Formation Region

View as list of objects

Detection table from Ashimbaeva et al. (2023C)