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BAC90 - The 44 GHz methanol masers - Results of an extensive survey in the 7(0)-6(1)A(+) line

Short title: Bachiller et al. (1990)
Authors: Bachiller, R. Gomez-Gonzalez, J. Barcia, A. Menten, K. M.
Journal: Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. 116-122.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (17 detection)
Target type: H2O

Abstract
A search for emission in the 44-GHz 7(0)-6(1)A(+) transition of CH3OH toward 124 known water masers associated with star-formation regions and evolved stars was conducted. Emission was detected toward 16 sources. In most sources maser action was observed, indicated by narrow intense spectral features. The methanol maser velocities were similar to the systemic velocities of the regions in question and showed no high-velocity features. Several new maser components were found in regions containing previously known methanol masers.

Abstract

A search for emission in the 44-GHz 7(0)-6(1)A(+) transition of CH3OH toward 124 known water masers associated with star-formation regions and evolved stars was conducted. Emission was detected toward 16 sources. In most sources maser action was observed, indicated by narrow intense spectral features. The methanol maser velocities were similar to the systemic velocities of the regions in question and showed no high-velocity features. Several new maser components were found in regions containing previously known methanol masers.

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Detection table from Bachiller et al. (1990)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Line	V_peak	FWHM	∫F dv	List	Beam	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)		CH₃OH (class I)	(km/s)	(km/s)	(Jy*km/s)		(arcsec)	Yes/No		(kpc)
1	18 36 12.5	-07 12 10.1	24.7898	0.0838	G24.790+0.083	44 GHz (I);	114.5	1.8	47.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		BAC90
2	18 08 56.1	-20 05 53.4	10.3014	-0.1477	G10.322-0.148	44 GHz (I);	13.8	2.3	29.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II	SFR_MIXED		BAC90
3	18 20 24.1	-16 11 27.2	15.0352	-0.6737	G15.033-0.674	44 GHz (I);	18.9	2.3	25.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		BAC90
4	18 58 12.7	+01 40 36.5	35.1966	-0.7419	G35.197-0.743	44 GHz (I);	34.2	3.9	8.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		BAC90
5	18 14 01	-18 53 25.2	11.9366	-0.6158	G11.937-0.616	44 GHz (I);	35.19	0.5	92.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II	SFR		BAC90
	18 14 01	-18 53 25.2	11.9366	-0.6158	G11.937-0.616	44 GHz (I);	35.8	4.1	92.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II	SFR		BAC90
7	18 27 38.1	-11 56 39.5	19.6088	-0.2351	G19.609-0.234	44 GHz (I);	41.43	0.8	23.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		BAC90
8	18 57 9.1	+01 39 03	35.0524	-0.5178	G35.052-0.518	44 GHz (I);	49.94	1.0	26.00	AVE02	2	+H₂O +CH₃OH I -CH₃OH II	SFR		BAC90
9	18 00 30.4	-24 04 16.5	5.8816	-0.3945	G5.885-0.392	44 GHz (I);	8.77	1.4	93.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		BAC90
	18 00 30.4	-24 04 16.5	5.8816	-0.3945	G5.885-0.392	44 GHz (I);	12.17	1.2	93.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY		BAC90
11	18 46 04	-02 39 21.5	29.9560	-0.0168	G29.956-0.016	44 GHz (I);	98.5	1.3	18.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II	SFR_MIXED		BAC90
12	05 39 12.9	+35 45 54	173.4808	2.4461	G173.481+2.446	44 GHz (I);	-16.67	0.55	14.70	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		BAC90
13	20 21 42.1	+37 26 7.5	75.7716	0.3432	G75.773+0.343	44 GHz (I);	-2	2.3	42.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		BAC90
14	20 38 59.6	+42 19 23.8	81.6738	0.5399	G81.711+0.563	44 GHz (I);	-3.67	0.64	32.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR		BAC90
15	02 25 53.6	+62 04 10.6	133.7486	1.1979	G133.749+1.198	44 GHz (I);	-38.4	0.7	10.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II	SFR		BAC90
16	23 13 45.4	+61 28 9.7	111.5422	0.7767	G111.542+0.769	44 GHz (I);	-57.35	1.13	52.00	AVE02	2	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		BAC90
17	21 43 49.5	+66 06 45.9	105.4689	9.8283	G105.469+9.828	44 GHz (I);	-6.4	1.1	16.00	AVE02	2	+CH₃OH I	EVOLVED		BAC90

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 BAC90

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