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SZY00C - New detections of OH sources towards the 6.7 GHz methanol masers

Short title: Szymczak & Kus (2000)
Authors: Szymczak, M.Kus, A. J.
Journal: Astronomy and Astrophysics Supplement, v.147, p.181-185
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: single-dish
Transitions: OH_1665,OH_1667

Abstract
A sample of 6.7 GHz methanol masers has been searched for OH maser emission at 1665 and 1667 MHz using the 32 m Torun� radio telescope. Eight new OH sources were detected. They are generally weak at radio and infrared wavelengths. In the northern hemisphere sample of 68 methanol sources the OH maser emission is associated with 49 sources. Generally OH masers do not arise in weak FIR sources. The ratio of OH to CH_3OH maser flux densities increases for objects with blue FIR colour and probably reflects evolutionary changes in the star-forming regions.

Abstract

A sample of 6.7 GHz methanol masers has been searched for OH maser emission at 1665 and 1667 MHz using the 32 m Torun� radio telescope. Eight new OH sources were detected. They are generally weak at radio and infrared wavelengths. In the northern hemisphere sample of 68 methanol sources the OH maser emission is associated with 49 sources. Generally OH masers do not arise in weak FIR sources. The ratio of OH to CH_3OH maser flux densities increases for objects with blue FIR colour and probably reflects evolutionary changes in the star-forming regions.

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Detection table from Szymczak & Kus (2000)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Image	Descr.	Line	Frequency	Polarization	V_peak	F_peak	Telescope	V_step	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)						OH	(MHz)		(km/s)	(Jy)		(km/s)	(Jy)	(arcsec)	Yes/No		(kpc)
1	05 41 38.6	+35 48 50.7	173.7000	2.8900	G173.698+2.886	G173.7000+2.8900	IRAS 05382+3547	Image	Descr	1665 MHz;	1665	L	-27.3	0.95	Torun_32m	0.1	0.200	999	-H₂O +CH₃OH II +OH -SiO	SFR		1999 October and December
	05 41 38.6	+35 48 50.7	173.7000	2.8900	G173.698+2.886	G173.7000+2.8900	IRAS 05382+3547	Image		1665 MHz;	1665	R	-22.2	0.51	Torun_32m	0.1	0.200	999	-H₂O +CH₃OH II +OH -SiO	SFR		1999 October and December
3	18 53 45.9	+00 33 54	33.7000	-0.2600	G33.700-0.260	G33.7000-0.2600	IRAS 18512+0029	Image	Descr	1665 MHz;	1665	L	60.8	7.85	Torun_32m	0.1	0.200	999	+OH			1999 October and December
	18 53 45.9	+00 33 54	33.7000	-0.2600	G33.700-0.260	G33.7000-0.2600	IRAS 18512+0029	Image		1665 MHz;	1665	R	60.9	9.54	Torun_32m	0.1	0.200	999	+OH			1999 October and December
5	18 53 45.9	+00 33 54	33.7000	-0.2600	G33.700-0.260	G33.7000-0.2600	IRAS 18512+0029	Image		1667 MHz;	1667	L	61.2	2.49	Torun_32m	0.1	0.200	999	+OH			1999 October and December
	18 53 45.9	+00 33 54	33.7000	-0.2600	G33.700-0.260	G33.7000-0.2600	IRAS 18512+0029	Image		1667 MHz;	1667	R	64.6	5.5	Torun_32m	0.1	0.200	999	+OH			1999 October and December
7	19 21 26.1	+15 44 10.8	50.3100	0.6800	G50.315+0.676	G50.3100+0.6800	IRAS 19191+1538	Image	Descr	1667 MHz;	1667	L	42.8	1.37	Torun_32m	0.1	0.200	999	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1999 October and December
	19 21 26.1	+15 44 10.8	50.3100	0.6800	G50.315+0.676	G50.3100+0.6800	IRAS 19191+1538	Image		1667 MHz;	1667	R	42.5	1.09	Torun_32m	0.1	0.200	999	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1999 October and December
9	19 30 27.9	+18 20 38	53.6300	0.0200	G53.619+0.035	G53.6300+0.0200	IRAS 19282+1814	Image	Descr	1665 MHz;	1665	L	7.2	0.47	Torun_32m	0.1	0.200	999	+OH			1999 October and December
	19 30 27.9	+18 20 38	53.6300	0.0200	G53.619+0.035	G53.6300+0.0200	IRAS 19282+1814	Image		1665 MHz;	1665	R	3	0.43	Torun_32m	0.1	0.200	999	+OH			1999 October and December
11	19 30 27.9	+18 20 38	53.6300	0.0200	G53.619+0.035	G53.6300+0.0200	IRAS 19282+1814	Image		1667 MHz;	1667	L	-4.1	0.79	Torun_32m	0.1	0.200	999	+OH			1999 October and December
	19 30 27.9	+18 20 38	53.6300	0.0200	G53.619+0.035	G53.6300+0.0200	IRAS 19282+1814	Image		1667 MHz;	1667	L	24.5	1.17	Torun_32m	0.1	0.200	999	+OH			1999 October and December
	19 30 27.9	+18 20 38	53.6300	0.0200	G53.619+0.035	G53.6300+0.0200	IRAS 19282+1814	Image		1667 MHz;	1667	R	-4.1	0.94	Torun_32m	0.1	0.200	999	+OH			1999 October and December
	19 30 27.9	+18 20 38	53.6300	0.0200	G53.619+0.035	G53.6300+0.0200	IRAS 19282+1814	Image		1667 MHz;	1667	R	24.4	1.21	Torun_32m	0.1	0.200	999	+OH			1999 October and December
15	19 38 47.2	+23 08 35.6	58.7700	0.6500	G58.774+0.644	G58.7747+0.6445	IRAS 19366+2301	Image	Descr	1665 MHz;	1665	L	32.5	0.54	Torun_32m	0.1	0.200	999	+OH			1999 October and December
16	19 38 47.2	+23 08 35.6	58.7700	0.6500	G58.774+0.644	G58.7747+0.6445	IRAS 19366+2301	Image		1667 MHz;	1667	L	33.8	0.78	Torun_32m	0.1	0.200	999	+OH			1999 October and December
	19 38 47.2	+23 08 35.6	58.7700	0.6500	G58.774+0.644	G58.7747+0.6445	IRAS 19366+2301	Image		1667 MHz;	1667	R	33.7	0.8	Torun_32m	0.1	0.200	999	+OH			1999 October and December
18	20 08 8.6	+35 59 21.9	73.0600	1.8000	G73.062+1.796	G73.0600+1.8000	IRAS 20062+3550	Image	Descr	1665 MHz;	1665	L	-2.4	0.76	Torun_32m	0.1	0.200	999	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1999 October and December
	20 08 8.6	+35 59 21.9	73.0600	1.8000	G73.062+1.796	G73.0600+1.8000	IRAS 20062+3550	Image		1665 MHz;	1665	R	-2.4	1.57	Torun_32m	0.1	0.200	999	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1999 October and December
20	21 09 6.2	+50 01 56.8	90.9200	1.5100	G90.920+1.507	G90.9200+1.5100	IRAS 21074+4949	Image	Descr	1665 MHz;	1665	L	-76	0.75	Torun_32m	0.1	0.200	999	+H₂O +CH₃OH II +OH	EVOLVED		1999 October and December
	21 09 6.2	+50 01 56.8	90.9200	1.5100	G90.920+1.507	G90.9200+1.5100	IRAS 21074+4949	Image		1665 MHz;	1665	L	-72.5	0.74	Torun_32m	0.1	0.200	999	+H₂O +CH₃OH II +OH	EVOLVED		1999 October and December
	21 09 6.2	+50 01 56.8	90.9200	1.5100	G90.920+1.507	G90.9200+1.5100	IRAS 21074+4949	Image		1665 MHz;	1665	R	-76	0.83	Torun_32m	0.1	0.200	999	+H₂O +CH₃OH II +OH	EVOLVED		1999 October and December
	21 09 6.2	+50 01 56.8	90.9200	1.5100	G90.920+1.507	G90.9200+1.5100	IRAS 21074+4949	Image		1665 MHz;	1665	R	-72.6	0.42	Torun_32m	0.1	0.200	999	+H₂O +CH₃OH II +OH	EVOLVED		1999 October and December
24	22 28 53.7	+64 13 55.6	108.1900	5.5200	G108.186+5.518	G108.1900+5.5200	IRAS 22272+6358	Image	Descr	1665 MHz;	1665	L	-10.9	1.38	Torun_32m	0.1	0.200	999	-H₂O -CH₃OH I +CH₃OH II +OH	SFR		1999 October and December
	22 28 53.7	+64 13 55.6	108.1900	5.5200	G108.186+5.518	G108.1900+5.5200	IRAS 22272+6358	Image		1665 MHz;	1665	R	-8.9	0.79	Torun_32m	0.1	0.200	999	-H₂O -CH₃OH I +CH₃OH II +OH	SFR		1999 October and December
26	22 28 53.7	+64 13 55.6	108.1900	5.5200	G108.186+5.518	G108.1900+5.5200	IRAS 22272+6358	Image		1667 MHz;	1667	L	-11.7	1.4	Torun_32m	0.1	0.200	999	-H₂O -CH₃OH I +CH₃OH II +OH	SFR		1999 October and December
	22 28 53.7	+64 13 55.6	108.1900	5.5200	G108.186+5.518	G108.1900+5.5200	IRAS 22272+6358	Image		1667 MHz;	1667	R	-10.7	1.06	Torun_32m	0.1	0.200	999	-H₂O -CH₃OH I +CH₃OH II +OH	SFR		1999 October and December

Non-detection table from Szymczak & Kus (2000)