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XU08 - A high-sensitivity 6.7 GHz methanol maser survey toward H2O sources

Short title: Xu et al. (2008)
Authors: Xu, Y.Li, J. J.Hachisuka, K.Pandian, J. D.Menten, K. M.Henkel, C.
Journal: Astronomy and Astrophysics, Volume 485, Issue 3, 2008, pp.729-734
Bibcode:

Target type: H2O
Transitions: CH3OH_6(II)

Abstract
We present the results of a high sensitivity survey for 6.7 GHz methanol masers towards 22 GHz water masers using the 100 m Efflesberg telescope. A total of 89 sources were observed and 10 new methanol masers were detected. The new detections are relatively faint with peak flux densities of between 0.5 and 4.0 Jy. A nil detection rate from low-mass star forming regions enhances the conclusion that the masers are only associated with massive star formation. Even the faintest methanol maser in our survey, with a luminosity of 1.1 x10^-9 L_sun is associated with massive stars, as inferred from its infrared luminosity. Table 3 is only available in electronic form at http://www.aanda.org

Abstract

We present the results of a high sensitivity survey for 6.7 GHz methanol masers towards 22 GHz water masers using the 100 m Efflesberg telescope. A total of 89 sources were observed and 10 new methanol masers were detected. The new detections are relatively faint with peak flux densities of between 0.5 and 4.0 Jy. A nil detection rate from low-mass star forming regions enhances the conclusion that the masers are only associated with massive star formation. Even the faintest methanol maser in our survey, with a luminosity of 1.1 x10^-9 L_sun is associated with massive stars, as inferred from its infrared luminosity. Table 3 is only available in electronic form at

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Detection table from Xu et al. (2008)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Descr.	Line	V_range	V_peak	F_peak	∫F dv	Telescope	Beam	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					CH₃OH (class II)	(km/s)	(km/s)	(Jy)	(Jy*km/s)		(arcsec)	Yes/No		(kpc)	(kpc)
1	05 17 13.3	+39 22 14	168.0631	0.8197	G168.063+0.820	05137+3919	Image	Descr	6.6 GHz (II);	-21.1;-16	-16.2	1.5	0.7	EFF	120	+H₂O -CH₃OH I +CH₃OH II +OH	GALAXY	12.010		2006 Feb-May
2	06 47 12.9	+00 26 07	212.0631	-0.7411	G212.063-0.741	06446+0029	Image	Descr	6.6 GHz (II);	42.7;50.0	48.6	1.6	2.8	EFF	120	+H₂O +CH₃OH I +CH₃OH II	SFR	6.010		2006 Feb-May
3	18 34 38.2	-07 59 35	23.9090	0.0657	G23.901+0.066	18319-0802	Image	Descr	6.6 GHz (II);	31.0;45.2	35.7	2.1	2.2	EFF	120	+H₂O -CH₃OH I +CH₃OH II +OH	MIXED	2.800		2006 Feb-May
4	18 38 14.3	-06 47 47	25.3822	-0.1772	G25.382-0.181	18355-0650	Image	Descr	6.6 GHz (II);	56.6;62.1	58.2	3.9	4.2	EFF	120	+H₂O -CH₃OH I +CH₃OH II	MIXED	5.740		2006 Feb-May
5	18 43 1.1	-04 36 41	27.8692	-0.2336	G27.869-0.236	18403-0440	Image	Descr	6.6 GHz (II);	19.8;20.4	20.1	1	0.3	EFF	120	+H₂O +CH₃OH II	SFR	3.340		2006 Feb-May
6	18 46 5.9	-02 42 27	29.9138	-0.0475	G29.915-0.043	G29.91-0.05	Image	Descr	6.6 GHz (II);	93.4;105.3	104.3	2.9	7.8	EFF	120	+H₂O +CH₃OH I +CH₃OH II +OH	MIXED	7.100		2006 Feb-May
7	18 50 31.1	-00 01 54	32.7989	0.1902	G32.797+0.191	18479-0005	Image	Descr	6.6 GHz (II);	24.9;28.3	27.4	1.5	1.3	EFF	120	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	13.020		2006 Feb-May
8	20 29 24.9	+40 11 21	78.8871	0.7090	G78.887+0.709	20275+4001	Image	Descr	6.6 GHz (II);	-7.4;-6.5	-6.9	4	1.7	EFF	120	+H₂O +CH₃OH I +CH₃OH II	SFR	2.030		2006 Feb-May
9	21 32 13	+55 52 56	97.5214	3.1719	G97.525+3.181	21306+5540	Image	Descr	6.6 GHz (II);	-73.7;-68	-69.9	1.1	1.5	EFF	120	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	8.610		2006 Feb-May
10	22 19 18.3	+63 18 48	106.7971	5.3122	G106.797+5.312	22176+6303	Image	Descr	6.6 GHz (II);	-2.3;-1.1	-2	0.5	0.2	EFF	120	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.960		2006 Feb-May

Non-detection table from Xu et al. (2008)