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COH95 - Excited OH 4.7-GHz masers associated with IRAS far-infrared sources - II

Short title: Cohen et al. (1995)
Authors: Cohen, R. J.Masheder, M. R. W.Caswell, J. L.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 3, pp. 808-820.
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Target type: IRAS
Observations category: SF.general
Facility type: single-dish
Transitions: OH_4660,OH_4750,OH_4765

Abstract
A sample of 85 far-infrared sources selected from the IRAS Point Source Catalog has been searched for maser emission from excited OH in the ^2Pi_1/2 J=1/2 state, in the three transitions at 4765, 4750 and 4660 MHz. Four new detections were made at 4765 MHz, including one source where ground-state OH maser emission has not been reported. One new detection was made at 4660 MHz. This source OH 351.78-0.54 is remarkable in that it was detected only at 4660 MHz, and not at 4765 or 4750 MHz. Positions were measured for the new detections and for six previously known 4.7-GHz maser sources. In some cases the excited OH 4.7-GHz positions are significantly different from the positions of previously known ground-state OH 18-cm masers. The 4.7-GHz sources are among the brighter far-infrared sources in the IRAS sample. In most cases they are also OH 18-cm masers. There is a strong association between OH 4.7-GHz emission and OH 18-cm maser emission in the 1720-MHz transition. More than half of the 4.7-GHz masers that were examined for variability showed strong variations on a time-scale of a year.

Abstract

A sample of 85 far-infrared sources selected from the IRAS Point Source Catalog has been searched for maser emission from excited OH in the ^2Pi_1/2 J=1/2 state, in the three transitions at 4765, 4750 and 4660 MHz. Four new detections were made at 4765 MHz, including one source where ground-state OH maser emission has not been reported. One new detection was made at 4660 MHz. This source OH 351.78-0.54 is remarkable in that it was detected only at 4660 MHz, and not at 4765 or 4750 MHz. Positions were measured for the new detections and for six previously known 4.7-GHz maser sources. In some cases the excited OH 4.7-GHz positions are significantly different from the positions of previously known ground-state OH 18-cm masers. The 4.7-GHz sources are among the brighter far-infrared sources in the IRAS sample. In most cases they are also OH 18-cm masers. There is a strong association between OH 4.7-GHz emission and OH 18-cm maser emission in the 1720-MHz transition. More than half of the 4.7-GHz masers that were examined for variability showed strong variations on a time-scale of a year.

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Detection table from Cohen et al. (1995)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Other name	Image	Descr.	Line	Frequency	V_peak	F_peak	Telescope	V_step	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)				Other name			OH	(MHz)	(km/s)	(Jy)		(km/s)	(arcsec)	Yes/No		(kpc)
1	02 25 42.8	+62 06 5.1	133.7176	1.2201	G133.715+1.215	G133.7176+1.2201	02219+6152	W3-IRS5	Image		4765 MHz;	4765	-38	1.65	PRS	0.25	282	+H₂O -CH₃OH I +CH₃OH II +OH	SFR_MIXED		1991 Mar/Apr
2	02 27 1.1	+61 52 13.7	133.9434	1.0594	G133.947+1.064	G133.9434+1.0594	02232+6138	W3(OH)	Image		4765 MHz;	4765	-44	3.5	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1991 Mar/Apr
3	06 07 46.7	-06 22 59.6	213.7034	-12.6017	G213.705-12.597	G213.7049-12.5970	06053-0622	Mon-R2	Image		4765 MHz;	4765	11	0.53	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1991 Mar/Apr
4	12 10 0.4	-62 49 56.8	298.2229	-0.3401	G298.215-0.340	G298.2229-0.3402	12073-6233		Image		4765 MHz;	4765	32	0.41	PRS	0.25	282	+H₂O -CH₃OH I +CH₃OH II +OH			1991 Mar/Apr
5	16 22 09	-50 05 59.7	333.6032	-0.2115	G333.608-0.215	G333.6032-0.2115	16183-4958		Image		4765 MHz;	4765	-50	0.22	PRS	0.25	282	+H₂O +CH₃OH I +OH	SFR_MIXED		1991 Mar/Apr
6	17 20 54.7	-35 47 2.4	351.4193	0.6412	G351.417+0.645	G351.4193+0.6412	17175-3544	NGC6334F	Image		4765 MHz;	4765	-10	0.3	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1991 Mar/Apr
7	17 26 44.3	-36 09 27.3	351.7757	-0.5428	G351.775-0.536	G351.7757-0.5428	17233-3606	OH 351.78-0.54	Image	Descr	4660 MHz;	4660	2	1.06	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1991 Mar/Apr
8	17 30 28.9	-34 41 40	353.4162	-0.3670	G353.410-0.360	G353.4099-0.3602	17271-3439	OH 353.41-0.36	Image		4765 MHz;	4765	-21	1.7	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1991 Mar/Apr
9	19 10 15.3	+09 06 8.5	43.1689	0.0037	G43.166+0.011	G43.1669+0.0106	19078+0901	W49N	Image	Descr	4765 MHz;	4765	2	2.4	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1991 Mar/Apr
10	19 23 41.7	+14 30 45.3	49.4881	-0.3781	G49.489-0.385	G49.4879-0.3800	W51	W51	Image		4765 MHz;	4765	57	0.38	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR_MIXED		1991 Mar/Apr
11	20 01 45.6	+33 32 44.1	70.2928	1.6006	G70.293+1.601	G70.2928+1.6006	19598+3324	K3-50	Image		4765 MHz;	4765	20	1.02	PRS	0.25	282	+H₂O +CH₃OH I -CH₃OH II +OH -SiO	SFR_MIXED		1991 Mar/Apr
12	20 39 0.9	+42 24 45.9	81.7472	0.5913	G81.762+0.596	G81.7444+0.5910	DR21(OH)N	DR21(OH)N	Image	Descr	4765 MHz;	4765	0.0	3.8	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1991 Mar/Apr
13	21 43 1.4	+54 56 16.3	98.0354	1.4458	G98.035+1.446	G98.0354+1.4458	21413+5442		Image		4765 MHz;	4765	-62	0.7	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1991 Mar/Apr
14	23 13 45.6	+61 28 17.7	111.5434	0.7786	G111.542+0.769	G111.5421+0.7769	23116+6111	NGC7538	Image		4765 MHz;	4765	-59	0.69	PRS	0.25	282	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1991 Mar/Apr

Non-detection table from Cohen et al. (1995)