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MOR85 - New maser lines of methanol

Short title: Morimoto et al. (1985)
Authors: Morimoto, M. Ohishi, M. Kanzawa, T.
Journal: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 288, Jan. 1, 1985, p. L11-L15. Research supported by the Ministry of Education of Japan.
Bibcode:

Target type: First_detection,HII

Abstract
It is found that the 4(-1)-3(0) E line (36.169 GHz) of methanol (CH3OH) is a maser in Sgr B2, with an antenna temperature of up to 60 K and a velocity width of 10 km/s. This maser is spatially extended with angular size of up to 90 arcsec, is distributed along the edge of H II regions, and apparently is not directly attached to star forming regions. Components with a narrow velocity width also exist. They are unresolved by our beam and have a velocity width of less than 1.5 km/s. We also discovered a new maser line of CH3OH, the 7(0)-6(1) A line (44.069 GHz) in Sgr B2, W51, and two other galactic sources. These two maser lines have different radial velocities. Excitation study shows that these two lines can be inverted easily but require a kinetic temperature of greater than 80 K and a fractional abundance of methanol to molecular hydrogen of 10 to the -7th for intense maser action.

Abstract

It is found that the 4(-1)-3(0) E line (36.169 GHz) of methanol (CH3OH) is a maser in Sgr B2, with an antenna temperature of up to 60 K and a velocity width of 10 km/s. This maser is spatially extended with angular size of up to 90 arcsec, is distributed along the edge of H II regions, and apparently is not directly attached to star forming regions. Components with a narrow velocity width also exist. They are unresolved by our beam and have a velocity width of less than 1.5 km/s. We also discovered a new maser line of CH3OH, the 7(0)-6(1) A line (44.069 GHz) in Sgr B2, W51, and two other galactic sources. These two maser lines have different radial velocities. Excitation study shows that these two lines can be inverted easily but require a kinetic temperature of greater than 80 K and a fractional abundance of methanol to molecular hydrogen of 10 to the -7th for intense maser action.

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Detection table from Morimoto et al. (1985)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Line	V_peak	FWHM	List	Beam	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)		CH₃OH (class I)	(km/s)	(km/s)		(arcsec)	Yes/No		(kpc)
1	18 17 24.9	-17 22 12.3	13.6580	-0.6016	G13.657-0.600	36 GHz (I);	48		AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		MOR85
2	18 47 47	-01 54 28.1	30.8175	-0.0571	G30.817-0.057	36 GHz (I);	100	7	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		MOR85
3	19 23 53.7	+14 30 37.1	49.5090	-0.4218	G49.509-0.422	36 GHz (I);	48	1.5	AVE02	50	+CH₃OH I	SFR		MOR85
	19 23 53.7	+14 30 37.1	49.5090	-0.4218	G49.509-0.422	36 GHz (I);	55	7	AVE02	50	+CH₃OH I	SFR		MOR85
5	17 47 20.4	-28 21 57.2	0.6833	-0.0261	G0.6814-0.0271	36 GHz (I);	58	10	AVE02	50	+CH₃OH I	MIXED		MOR85

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	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(met1_data_all.ra_hms) as ra_hms,MAX(met1_data_all.dec_dms) as dec_dms,MAX(met1_data_all.source_name) as source_name,MAX(met1_data_all.ra) as ra,MAX(met1_data_all.dec) as dec,MAX(met1_data_all.l) as l,MAX(met1_data_all.b) as b,MAX(met1_data_all.grp) as grp,MAX(met1_data_all.other_name) as other_name,MAX(met1_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met1_data_all.line) as line,MAX(met1_data_all.vrange) as vrange,MAX(met1_data_all.vpeak) as vpeak,MAX(met1_data_all.peak) as peak,MAX(met1_data_all.fwhm) as fwhm,MAX(met1_data_all.int) as int,MAX(met1_data_all.rms) as rms,MAX(met1_data_all.units) as units,MAX(met1_data_all.units_rms) as units_rms,MAX(met1_data_all.date_txt) as date_txt,MAX(met1_data_all.telescope_ref) as telescope_ref,MAX(met1_data_all.telescope_conf) as telescope_conf,MAX(met1_data_all.v_step) as v_step,MAX(met1_data_all.beam) as beam,MAX(met1_data_all.beam_maj) as beam_maj,MAX(met1_data_all.beam_min) as beam_min,MAX(met1_data_all.beam_pa) as beam_pa,MAX(met1_data_all.ref) as ref,MAX(met1_data_all.list_ref) as list_ref,MAX(met1_data_all.ascii) as ascii,MAX(met1_data_all.url) as url,MAX(met1_data_all.image) as image,MAX(met1_data_all.image2) as image2,MAX(met1_data_all.image3) as image3,MAX(met1_data_all.descr) as descr,MAX(met1_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met1_data_all.dist) as dist,1 as dist_parallax,MAX(met1_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 met1_data_all  LEFT JOIN all_objects_withmet ON met1_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 met1_data_all.line=transitions."Line"  WHERE ref ilike 'MOR85' AND detected=true AND hide=false GROUP BY ref

select met1_data_all.ra_hms,met1_data_all.dec_dms,met1_data_all.source_name,met1_data_all.ra,met1_data_all.dec,met1_data_all.l,met1_data_all.b,met1_data_all.grp,met1_data_all.other_name,met1_data_all.other_desc,met1_data_all.thermal,met1_data_all.line,met1_data_all.vrange,met1_data_all.vpeak,met1_data_all.peak,met1_data_all.fwhm,met1_data_all.int,met1_data_all.rms,met1_data_all.units,met1_data_all.units_rms,met1_data_all.date_txt,met1_data_all.telescope_ref,met1_data_all.telescope_conf,met1_data_all.v_step,met1_data_all.beam,met1_data_all.beam_maj,met1_data_all.beam_min,met1_data_all.beam_pa,met1_data_all.ref,met1_data_all.list_ref,met1_data_all.ascii,met1_data_all.url,met1_data_all.image,met1_data_all.image2,met1_data_all.image3,met1_data_all.descr,met1_data_all.id,met1_data_all.mjy_flag,met1_data_all.rms_mjy_flag,met1_data_all.dist,met1_data_all.dist_parallax,met1_data_all.date_txt,line_det,type,simbad_types_cat FROM met1_data_all   LEFT JOIN all_objects_withmet ON met1_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 met1_data_all.line=transitions."Line"  WHERE ref ilike 'MOR85' AND detected=true AND hide=false ORDER BY detected DESC,id

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MOR85 - New maser lines of methanol

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Detection table from Morimoto et al. (1985)