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MAT80 - An interferometric and multitransitional study of the Orion methanol masers

Interferometry data

Short title: Matsakis et al. (1980)
Authors: Matsakis, D. N. Wright, M. C. H. Townes, C. H. Welch, W. J. Cheung, A. C. Askne, J. I. H.
Journal: Astrophysical Journal, Part 1, vol. 236, Mar. 1, 1980, p. 481-491.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (2 detection)
Target type: High_mass_SFR
Transitions: CH3OH_25-30_GHz(I)

Abstract
The paper considers the methanol source in OMC-1 interferometrically mapped in two masing transitions with wavelengths near 1 cm. The source consisted of 10 components with different Doppler velocities most of the components radiate in both of the mapped transitions, and have brightness temperatures or limits of 1000-4000 K. The molecular excitation was studied with a series of single-dish measurements, and a new methanol transition was detected. It is concluded that the methanol masers are being excited by infrared emission from other objects in the vicinity.

Abstract

The paper considers the methanol source in OMC-1 interferometrically mapped in two masing transitions with wavelengths near 1 cm. The source consisted of 10 components with different Doppler velocities most of the components radiate in both of the mapped transitions, and have brightness temperatures or limits of 1000-4000 K. The molecular excitation was studied with a series of single-dish measurements, and a new methanol transition was detected. It is concluded that the methanol masers are being excited by infrared emission from other objects in the vicinity.

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Detection table from Matsakis et al. (1980)

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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	Major	Minor	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					CH₃OH (class I)	(km/s)	(K)	(arcsec)	(arcsec)		Yes/No		(kpc)
1	+05 35 13.9716	-05 22 37.5207			208.99386	-19.387575	G208.993-19.385			OMC-1 (25.0 GHz)	25.0 GHz (I);	6.5 .. 9.7	130 .. 950			HCRO	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	SFR_MIXED		November and December of 1977
	+05 35 14.6383	-05 22 33.5204	10000 mas	4000 mas	208.994135	-19.384606		1	8	OMC-1 (25.0 GHz)		6.5	220	5.377	-5.377
	+05 35 14.6383	-05 22 37.5204	10000 mas	0 mas	208.995186	-19.385108		2	8	OMC-1 (25.0 GHz)		6.8	240	10.000	10.000
	+05 35 15.0383	-05 22 44.5204	16000 mas	-7000 mas	208.997820	-19.384508		3	10	OMC-1 (25.0 GHz)		6.8	260	10.000	16.000
	+05 35 13.7716	-05 21 58.5204	-3000 mas	39000 mas	208.983220	-19.383413		4	1*	OMC-1 (25.0 GHz)		7.3	130*	18.000	15.000
	+05 35 14.3716	-05 22 36.5204	6000 mas	1000 mas	208.994393	-19.385969		5	7*	OMC-1 (25.0 GHz)		7.3	200*	5.377	-5.377
	+05 35 14.9049	-05 22 36.5204	14000 mas	1000 mas	208.995454	-19.383996		6	8*	OMC-1 (25.0 GHz)		7.3	280*	14.000	16.000
	+05 35 15.0383	-05 22 44.5204	16000 mas	-7000 mas	208.997820	-19.384508		7	10	OMC-1 (25.0 GHz)		7.3	870	10.000	16.000
	+05 35 13.5049	-05 22 0.5204	-7000 mas	37000 mas	208.983214	-19.384651		8	1*	OMC-1 (25.0 GHz)		7.8	180*	8.000	12.000
	+05 35 15.2383	-05 22 44.5204	19000 mas	-7000 mas	208.998218	-19.383768		9	10	OMC-1 (25.0 GHz)		7.8	630	10.000	15.000
	+05 35 14.2383	-05 22 39.5204	4000 mas	-2000 mas	208.994915	-19.386840		10	7	OMC-1 (25.0 GHz)		7.8	750	10.000	16.000
	+05 35 13.7049	-05 22 23.5204	-4000 mas	14000 mas	208.989652	-19.386802		11	2	OMC-1 (25.0 GHz)		7.8	800	12.000	17.000
	+05 35 13.5716	-05 21 58.5204	-6000 mas	39000 mas	208.982822	-19.384153		12	1*	OMC-1 (25.0 GHz)		8.3	140	8.000	14.000
	+05 35 15.1716	-05 22 44.5204	18000 mas	-7000 mas	208.998085	-19.384015		13	10	OMC-1 (25.0 GHz)		8.3	380	18.000	17.000
	+05 35 14.1049	-05 22 38.5204	2000 mas	-1000 mas	208.994387	-19.387207		14	7*	OMC-1 (25.0 GHz)		8.3	420	11.000	18.000
	+05 35 13.6383	-05 22 23.5204	-5000 mas	14000 mas	208.989520	-19.387049		15	2	OMC-1 (25.0 GHz)		8.3	950	10.000	16.000
	+05 35 14.9049	-05 22 45.5204	14000 mas	-8000 mas	208.997817	-19.385127		16	10*	OMC-1 (25.0 GHz)		8.6	130*	8.000	16.000
	+05 35 14.0383	-05 22 36.5204	1000 mas	1000 mas	208.993730	-19.387203		17	7*	OMC-1 (25.0 GHz)		8.6	250	5.377	-5.377
	+05 35 13.7049	-05 22 27.5204	-4000 mas	10000 mas	208.990703	-19.387305		18	2	OMC-1 (25.0 GHz)		8.6	440	14.000	19.000
	+05 35 13.7049	-05 22 31.5204	-4000 mas	6000 mas	208.991753	-19.387807		19	3	OMC-1 (25.0 GHz)		9.1	250	9.000	14.000
	+05 35 14.2383	-05 22 13.5204	4000 mas	24000 mas	208.988087	-19.383572		20	6	OMC-1 (25.0 GHz)		9.7	250	8.000	15.000
2	+05 35 13.9716	-05 22 37.5207			208.99386	-19.387575	G208.993-19.385			OMC-1 (25.1 GHz)	25.1 GHz (I);	6.5 .. 9.7	120 .. 930			HCRO	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	SFR_MIXED		November and December of 1977
	+05 35 14.7716	-05 22 40.5204	12000 mas	-3000 mas	208.996239	-19.384992		1	8	OMC-1 (25.1 GHz)		6.5	210	8.000	16.000
	+05 35 13.8383	-05 22 33.5204	-2000 mas	4000 mas	208.992544	-19.387565		2	4	OMC-1 (25.1 GHz)		6.5	310	9.000	11.000
	+05 35 14.7049	-05 22 42.5204	11000 mas	-5000 mas	208.996632	-19.385490		3	8	OMC-1 (25.1 GHz)		6.8	420	12.000	15.000
	+05 35 13.9049	-05 22 25.5204	-1000 mas	12000 mas	208.990576	-19.386313		4	2	OMC-1 (25.1 GHz)		7.3	240	5.377	-5.377
	+05 35 14.3716	-05 22 36.5204	6000 mas	1000 mas	208.994393	-19.385969		5	7	OMC-1 (25.1 GHz)		7.3	370*	5.377	-5.377
	+05 35 14.6383	-05 22 29.5204	10000 mas	8000 mas	208.993085	-19.384103		6	9	OMC-1 (25.1 GHz)		7.3	380*	5.377	-5.377
	+05 35 15.0383	-05 22 42.5204	16000 mas	-5000 mas	208.997295	-19.384257		7	10	OMC-1 (25.1 GHz)		7.3	930	10.000	16.000
	+05 35 14.9049	-05 22 25.5204	14000 mas	12000 mas	208.992565	-19.382614		8	9*	OMC-1 (25.1 GHz)		7.8	310*	8.000	13.000
	+05 35 13.4383	-05 22 3.5204	-8000 mas	34000 mas	208.983870	-19.385275		9	1	OMC-1 (25.1 GHz)		7.8	380	8.000	16.000
	+05 35 15.1716	-05 22 42.5204	18000 mas	-5000 mas	208.997560	-19.383764		10	10	OMC-1 (25.1 GHz)		7.8	490	12.000	14.000
	+05 35 14.3049	-05 22 36.5204	5000 mas	1000 mas	208.994260	-19.386216		11	7	OMC-1 (25.1 GHz)		7.8	580	14.000	16.000
	+05 35 13.7049	-05 22 21.5204	-4000 mas	16000 mas	208.989127	-19.386551		12	2	OMC-1 (25.1 GHz)		7.8	880	10.000	16.000
	+05 35 15.3716	-05 22 42.5204	21000 mas	-5000 mas	208.997958	-19.383024		13	10*	OMC-1 (25.1 GHz)		8.3	170*	16.000	13.000
	+05 35 13.7716	-05 22 24.5204	-3000 mas	13000 mas	208.990048	-19.386681		14	2	OMC-1 (25.1 GHz)		8.3	870	11.000	17.000
	+05 35 14.0383	-05 22 26.5204	1000 mas	11000 mas	208.991103	-19.385946		15	5	OMC-1 (25.1 GHz)		8.6	500	12.000	19.000
	+05 35 13.9716	-05 22 35.5204	0 mas	2000 mas	208.993334	-19.387323		16	3	OMC-1 (25.1 GHz)		9.1	120*	5.377	-5.377
	+05 35 14.1049	-05 22 13.5204	2000 mas	24000 mas	208.987822	-19.384065		17	6	OMC-1 (25.1 GHz)		9.7	180	10.000	18.000

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 MAT80

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