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VAN96 - A search for 5_1-6_0 A^+-methanol masers towards faint IRAS sources

Short title: van der Walt et al. (1996)
Authors: van der Walt, D. J.Retief, S. J. P.Gaylard, M. J.MacLeod, G. C.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 3, pp. 1085-1095.
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Target type: IRAS
Transitions: CH3OH_6(II)

Abstract
We present the results of a search for 6.7-GHz methanol maser emission towards 241 colour-selected IRAS sources for which the flux density at 60 μm is less than 100 Jy. All the candidate sources meet the Wood & Churchwell criteria for ultracompact HII regions. Five new methanol maser sources are detected. We also present average distributions for the distances of the maser sources perpendicular to the Galactic plane, the maser luminosities, and the masses of the exciting stars obtained by using a statistical procedure to handle the ambiguity of kinematic distances. The mass distributions are used to obtain lower limits for the duration of the masing phase for masers associated with embedded stars with mass greater than 35 M_solar.

Abstract

We present the results of a search for 6.7-GHz methanol maser emission towards 241 colour-selected IRAS sources for which the flux density at 60 μm is less than 100 Jy. All the candidate sources meet the Wood & Churchwell criteria for ultracompact HII regions. Five new methanol maser sources are detected. We also present average distributions for the distances of the maser sources perpendicular to the Galactic plane, the maser luminosities, and the masses of the exciting stars obtained by using a statistical procedure to handle the ambiguity of kinematic distances. The mass distributions are used to obtain lower limits for the duration of the masing phase for masers associated with embedded stars with mass greater than 35 M_solar.

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Detection table from van der Walt et al. (1996)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Image	Line	V_range	F_peak	∫F dv	Telescope	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					CH₃OH (class II)	(km/s)	(Jy)	(Jy*km/s)		(Jy)	(arcsec)	Yes/No		(kpc)
1	05 41 21.3	+35 52 6.7	173.6228	2.8690	G173.621+2.869	G173.6221+2.8679	05379-3550	Image	6.6 GHz (II);	-25;-23	9.8 (0.9)	0.41 (0.01)	HartRAO	5.000	420	-H₂O -CH₃OH I +CH₃OH II	SFR		1993 Aug-Dec
2	11 56 50.1	-63 32 11.4	296.8934	-1.3067	G296.893-1.305	G296.8931-1.3051	11543-6315	Image	6.6 GHz (II);	21.5;23	6.0 (0.9)	0.16 (0.01)	HartRAO	5.000	420	-H₂O +CH₃OH II -OH	SFR		1993 Aug-Dec
3	14 08 39.6	-61 13 0.9	312.0916	0.2740	G312.108+0.262	G312.0916+0.2740	14054-6102	Image	6.6 GHz (II);	-52;-48	24.2 (1.4)	1.6 (0.04)	HartRAO	5.000	420	+H₂O -CH₃OH I +CH₃OH II -OH	SFR		1993 Aug-Dec
4	19 32 35.3	+16 57 33.5	52.6599	-1.0899	G52.663-1.092	G52.6626-1.0920	19303-1651	Image	6.6 GHz (II);	64;68	26.6 (1.8)	0.87 (0.02)	HartRAO	5.000	420	+H₂O +CH₃OH II -OH			1993 Aug-Dec
5	20 30 50.9	+41 02 25.9	79.7357	0.9897	G79.736+0.990	G79.7357+0.9904	20290-4052	Image	6.6 GHz (II);	-6.5;3	21.2 (1.1)	1.39 (0.02)	HartRAO	5.000	420	+H₂O -CH₃OH I +CH₃OH II -OH	SFR		1993 Aug-Dec
6	05 41 21.3	+35 52 6.7	173.6228	2.8690	G173.621+2.869	G173.6221+2.8679	05379-3550	Image	6.6 GHz (II);	-25;-23	8.2 (0.5)	0.41 (0.01)	HartRAO	5.000	420	-H₂O -CH₃OH I +CH₃OH II	SFR		1995 Oct
7	11 56 50.1	-63 32 11.4	296.8934	-1.3067	G296.893-1.305	G296.8931-1.3051	11543-6315	Image	6.6 GHz (II);	21.5;23	2.4 (0.6)	0.16 (0.01)	HartRAO	5.000	420	-H₂O +CH₃OH II -OH	SFR		1995 Oct
8	14 08 39.6	-61 13 0.9	312.0916	0.2740	G312.108+0.262	G312.0916+0.2740	14054-6102	Image	6.6 GHz (II);	-52;-48	15.0 (1.0)	1.6 (0.04)	HartRAO	5.000	420	+H₂O -CH₃OH I +CH₃OH II -OH	SFR		1995 Oct
9	19 32 35.3	+16 57 33.5	52.6599	-1.0899	G52.663-1.092	G52.6626-1.0920	19303-1651	Image	6.6 GHz (II);	64;68	10.0 (0.7)	0.87 (0.02)	HartRAO	5.000	420	+H₂O +CH₃OH II -OH			1995 Oct
10	20 30 50.9	+41 02 25.9	79.7357	0.9897	G79.736+0.990	G79.7357+0.9904	20290-4052	Image	6.6 GHz (II);	-6.5;3	26.5 (1.5)	1.39 (0.02)	HartRAO	5.000	420	+H₂O -CH₃OH I +CH₃OH II -OH	SFR		1995 Oct

Non-detection table from van der Walt et al. (1996)