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SLY93 - The detection of a new methanol maser transition at 9.9 GHz

Short title: Slysh et al. (1993)
Authors: Slysh, V. I. Kalenskij, S. V. Val'tts, I. E.
Journal: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 413, no. 2, p. L133-L135.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (5 detection) Non-detection table: Show non-detection table (12 non-detection)
Target type: First_detection
Transitions: CH3OH_9(I)

Abstract
The paper reports the detection, at 9.94 GHz, of a new methanol emission line, 9(-1)-8(-2) E in observations made during April 2-3, 1992 with the 43-m NRAO radio telescope at Green Bank (West Virginia). From a sample of 11 sources, three were detected in emission for the 9(-1)-8(-2) E line: Orion-KL, Sgr B2, and W33 Met. The line in W33-Met shows properties of class I masers, while in Orion-KL and in Sgr B, the line is thermal. No lines were detected in the 4(3)-5(2) A(+) (at 9.98 GHz) and 4(3)-5(2) A- (at 10.06 GHz) transitions, which, according to theoretical predictions, might show maser emission.

Abstract

The paper reports the detection, at 9.94 GHz, of a new methanol emission line, 9(-1)-8(-2) E in observations made during April 2-3, 1992 with the 43-m NRAO radio telescope at Green Bank (West Virginia). From a sample of 11 sources, three were detected in emission for the 9(-1)-8(-2) E line: Orion-KL, Sgr B2, and W33 Met. The line in W33-Met shows properties of class I masers, while in Orion-KL and in Sgr B, the line is thermal. No lines were detected in the 4(3)-5(2) A(+) (at 9.98 GHz) and 4(3)-5(2) A- (at 10.06 GHz) transitions, which, according to theoretical predictions, might show maser emission.

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Detection table from Slysh et al. (1993)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Line	V_peak	FWHM	F_peak	Telescope	V_step	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)				CH₃OH (class I)	(km/s)	(km/s)	(Jy)		(km/s)	(arcsec)	Yes/No		(kpc)
1	05 35 14.5	-05 22 26.6	208.9920	-19.3843	G208.993-19.385	Orion-KL	Image	9.93 GHz (I);	8.7 (0.2)	2.4 (0.3)	0.25 (0.04)	GBT	0.29	204	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	SFR_MIXED		1992 April 2-3
2	17 47 20.1	-28 23 4.3	0.6668	-0.0349	G0.6667-0.0344	Sgr B2	Image	9.93 GHz (I);	62.5 (0.1)	14.3 (0.2)	0.19 (0.03)	GBT	1.2	204	+H₂O +CH₃OH I +CH₃OH II -OH	SFR		1992 April 2-3
3	17 47 20.1	-28 23 4.3	0.6668	-0.0349	G0.6667-0.0344	Sgr B2		10.05 GHz;	65	15	0.04d	GBT		204	+H₂O +CH₃OH I +CH₃OH II -OH	SFR		1992 April 2-3
4	18 14 10.7	-17 55 53.4	12.7970	-0.1908	G12.797-0.193	W33-Met	Image	9.93 GHz (I);	33.5 (0.02)	0.4 (0.01)	0.80 (0.10)	GBT	0.29	204	+H₂O +CH₃OH I +CH₃OH II	SFR		1992 April 2-3
5	18 14 10.7	-17 55 53.4	12.7970	-0.1908	G12.797-0.193	W33-Met		9.97 GHz;	37	0.5	0.17d	GBT		204	+H₂O +CH₃OH I +CH₃OH II	SFR		1992 April 2-3

Non-detection table from Slysh et al. (1993)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	F_peak	Telescope	RMS	Beam	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)			CH₃OH (class I)	(Jy)		(Jy)	(arcsec)	Yes/No
1	05 35 14.5	-05 22 26.6	208.9920	-19.3843	G208.993-19.385	Orion-KL	9.97 GHz;	<0.11b	GBT		204	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	SFR_MIXED	1992 April 2-3
2	05 35 14.5	-05 22 26.6	208.9920	-19.3843	G208.993-19.385	Orion-KL	10.05 GHz;	<0.11	GBT		204	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	SFR_MIXED	1992 April 2-3
3	17 47 20.1	-28 23 4.3	0.6668	-0.0349	G0.6667-0.0344	Sgr B2	9.97 GHz;	<0.019b	GBT		204	+H₂O +CH₃OH I +CH₃OH II -OH	SFR	1992 April 2-3
4	18 14 10.7	-17 55 53.4	12.7970	-0.1908	G12.797-0.193	W33-Met	10.05 GHz;	<0.13b	GBT		204	+H₂O +CH₃OH I +CH₃OH II	SFR	1992 April 2-3
5	02 27 4.4	+61 52 21.6	133.9487	1.0638	G133.949+1.064	W3(OH)	9.93 GHz (I);		GBT	0.060	204	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1992 April 2-3
6	17 20 54.1	-35 45 1.4	351.4456	0.6622	G351.446+0.660	NGC6334-I(N)	9.93 GHz (I);		GBT	0.080	204	+H₂O +CH₃OH I +CH₃OH II	SFR	1992 April 2-3
7	17 45 38.7	-29 05 9.7	359.8750	-0.0829	G359.8733-0.0824	SgrAc	9.93 GHz (I);		GBT	0.040	204	+CH₃OH I	SFR_MIXED	1992 April 2-3
8	18 10 28.5	-19 55 48.7	10.6233	-0.3830	G10.623-0.383	W31C	9.93 GHz (I);		GBT	0.080	204	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	1992 April 2-3
9	19 23 43.9	+14 30 36.4	49.4901	-0.3871	G49.488-0.387	W51 e1e2	9.93 GHz (I);		GBT	0.070	204	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	1992 April 2-3
10	20 38 54.6	+42 19 27.5	81.6653	0.5528	G81.711+0.563	DR21-West	9.93 GHz (I);		GBT	0.080	204	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	1992 April 2-3
11	20 39 0.7	+42 22 50.8	81.7216	0.5722	G81.711+0.563	DR21(OH)	9.93 GHz (I);		GBT	0.080	204	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR	1992 April 2-3
12	23 13 45.4	+61 28 13.7	111.5426	0.7777	G111.542+0.769	NGC 7538	9.93 GHz (I);		GBT	0.080	204	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1992 April 2-3

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 SLY93

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