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MEN89 - Observations of various methanol maser transitions toward the NGC 6334 region

Short title: Menten & Batrla (1989)
Authors: Menten, Karl M. Batrla, Wolfgang
Journal: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 839-846.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (4 detection)
Target type: High_mass_SFR
Transitions: CH3OH_19(II),CH3OH_23.1(II)

Abstract
A number of CH3OH lines toward the H-II region F in the NGC 6334 star-forming region have been observed in April 1987 with the 140-foot Green Bank telescope. Strong maser emission is found in the 2(1) to 3(0)E transition at 19.9 GHz and in the 9(2) to 10(1)A(+) transition at 23.1 GHz. The results suggest that the 12.1, 19.9, and 23.1 GHz methanol masers may be closely associated with compact H-II regions and OH masers, and that the 25 GHz masers may be associated with dense condensations in an earlier evolutionary state.

Abstract

A number of CH3OH lines toward the H-II region F in the NGC 6334 star-forming region have been observed in April 1987 with the 140-foot Green Bank telescope. Strong maser emission is found in the 2(1) to 3(0)E transition at 19.9 GHz and in the 9(2) to 10(1)A(+) transition at 23.1 GHz. The results suggest that the 12.1, 19.9, and 23.1 GHz methanol masers may be closely associated with compact H-II regions and OH masers, and that the 25 GHz masers may be associated with dense condensations in an earlier evolutionary state.

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Detection table from Menten & Batrla (1989)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	V_peak	FWHM	F_peak	Telescope	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)			CH₃OH (class II)	(km/s)	(km/s)	(Jy)		(arcsec)	Yes/No		(kpc)
1	17 20 53.4	-35 47 1.5	351.4170	0.6450	G351.417+0.645	NGC 6334-F	19 GHz (II);	-10.76(0.03)	0.56(0.07)	37.4(1.7)	GBT	102	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1987 April 7-10
	17 20 53.4	-35 47 1.5	351.4170	0.6450	G351.417+0.645	NGC 6334-F	19 GHz (II);	-10.38(0.01)	0.28(0.01)	412.7(5.7)	GBT	102	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1987 April 7-10
	17 20 53.4	-35 47 1.5	351.4170	0.6450	G351.417+0.645	NGC 6334-F	19 GHz (II);	-9.47(0.06)	0.64(0.14)	6.4(1.2)	GBT	102	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1987 April 7-10
4	17 20 53.4	-35 47 1.5	351.4170	0.6450	G351.417+0.645	NGC 6334-F	23 GHz (II);	-10.36(0.01)	0.25(0.01)	51.6(2.0)	GBT	72	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1987 April 7-10

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 MEN89

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