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BAT88 - Detection of a strong new maser line of methanol toward DR 21(OH)

Interferometry data

Short title: Batrla & Menten (1988)
Authors: Batrla, Wolfgang Menten, Karl M.
Journal: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 329, June 15, 1988, p. L117-L120. Research supported by the University of Illinois.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (1 detection)
Target type: First_detection
Transitions: CH3OH_84(I)

Abstract
The detection of a strong new maser emission line from the 5(-1)-4(0)E transition of methanol toward DR 21(OH) is reported. Interferometric observations with a resolution of 8.3 arcsec x 6.2 arcsec show that the line does not coincide in position with any of the known maser or infrared emission features toward this source. This strongly indicates an excitation mechanism for this methanol maser which is different from the physical conditions leading to the excitation of the water and OH masers. In addition, maser emission is found toward a condensation which has been detected in emission in the 2(11)-2(12) transition of formaldehyde. Besides maser emission, thermal emission lines from several compact sources are detected. Two of these sources are found very close to the OH maser position.

Abstract

The detection of a strong new maser emission line from the 5(-1)-4(0)E transition of methanol toward DR 21(OH) is reported. Interferometric observations with a resolution of 8.3 arcsec x 6.2 arcsec show that the line does not coincide in position with any of the known maser or infrared emission features toward this source. This strongly indicates an excitation mechanism for this methanol maser which is different from the physical conditions leading to the excitation of the water and OH masers. In addition, maser emission is found toward a condensation which has been detected in emission in the 2(11)-2(12) transition of formaldehyde. Besides maser emission, thermal emission lines from several compact sources are detected. Two of these sources are found very close to the OH maser position.

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Detection table from Batrla & Menten (1988)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Maser spot	Source name	Line	V_peak	T_a	∫T_a dv	Beam	PA	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					CH₃OH (class I)	(km/s)	(K)	(K*km/s)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+20 39 1.41467	+42 22 37.8807			81.720048	0.568267	G81.711+0.563			DR 21(OH)	84 GHz (I);	-1.56 .. 0.53	14.9 .. 136.21	..	8.3 x 6.2	56	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR
	+20 38 59.8066	+45 37 59.8804	-24120 mas	1.1722e+07 mas	84.303792	2.551235		1	1	DR 21(OH)		0.53(0.01)	136.21(2.55)
	+20 39 0.291893	+42 22 46.7404	-16840 mas	8860 mas	81.719899	0.572507		2	2	DR 21(OH)		0.07(0.02)	41.16(3.25)
	+20 39 0.343893	+42 22 46.5004	-16060 mas	8620 mas	81.719944	0.572340		3	2	DR 21(OH)		-0.51(0.11)	20.90(3.68)
	+20 39 0.39856	+42 22 46.7604	-15240 mas	8880 mas	81.720103	0.572250		4	2	DR 21(OH)		-1.56(0.10)	14.90(1.86)

Distribution of sources in all sky (l,b)

Distribution of sources in all sky using Aladin

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Distribution of sources in IRAS color-color diagram

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Original color diagram is taken form van der Veen & Habing (1987)

Type	Description
I	Oxygen-rich non-variable stars without circumstellar shells
II	Variable stars with "young" O-rich circumstellar shells
IIIa	Variable stars with more evolved O-rich circumstellar shells
IIIb	Variable stars with thick O-rich circumstellar shells
IV	Variable stars with very thick O-rich circumstellar shells
V	Planetary nebulae and non- variable stars with very cool circumstellar shells
VIa	Variable stars with relatively cold dust at large distances; a significant part of the stars is carbon-rich
VIb	Variable stars with relatively hot dust close to the star and relatively cold dust at large distances; Some of the objects have proven to be O-rich
VII	Variable stars with more evolved C-rich circumstellar shells
VIII	Different sort of objects

Distribution of the detection velocities versus galactic longitude from BAT88

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