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• Target type: High_mass_SFR,OH
  Observations category: SF.general
  Facility type: interferometer
  Transitions: OH_4765
  

• Abstract

  The Very Large Array (VLA) was used to determine precise positions for 4765-MHz OH maser emission sources toward star-forming regions which had been observed about seven months earlier with the Effelsberg 100-m telescope. The observations were successful for K3-50, DR21EX, W75N and W49A. No line was detected toward S255: this line had decreased to less than 5 per cent of the flux density observed only seven months earlier. The time-variability of the observed features during the past 30 yr is summarized. In addition, to compare with the Effelsberg observations, the 4750- and 4660-MHz lines were observed in W49A. These lines were found to originate primarily from an extended region which is distinguished as an exceptional collection of compact continuum components as well as by being the dynamical centre of the very powerful H2O outflow.

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	Frequency	Vpeak	Fpeak	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						OH	(MHz)	(km/s)	(mJy)	(mJy)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+19 10 15.6066	+09 06 12.503			43.170505	0.003109	G43.166+0.011		W49A	Image	Descr	4765 MHz;	4765	8.23	1440	15.000	4.26 x 1.83	-79.6	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		1984 March 23
	+19 10 10.9428	+09 05 17.7778	-69955.4 mas	-54725 mas	43.148161	0.013110		1	W49A					8.23	1440 (60)
2	+19 10 15.6066	+09 06 12.503			43.170505	0.003109	G43.166+0.011		W49A	Image		4750 MHz;	4750	..	..	15.000	4.11 x 1.72	-77.2	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		1984 March 23
3	+19 10 15.6066	+09 06 12.503			43.170505	0.003109	G43.166+0.011		W49A	Image		4660 MHz;	4660	..	..	15.000	4.33 x 1.7	-76.2	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		1984 March 23
4	+20 01 43.6033	+33 32 23.9859			70.284386	1.603528	G70.293+1.601		K3-50	Image	Descr	4765 MHz;	4765	-20.43	600	13.000	4.49 x 3.78	-60.4	+H2O +CH3OH I -CH3OH II +OH	SFR_MIXED		1984 April 29
	+20 01 45.7682	+33 32 45.5224	32474.6 mas	21536.8 mas	70.293442	1.600310		1	K3-50					-20.43	600 (40)
5	+20 39 0.913271	+42 22 37.8526			81.719103	0.569488	G81.718+0.571		DR21EX	Image	Descr	4765 MHz;	4765	5.23	12830	17.000	4.25 x 4.13	-51.1	+H2O +CH3OH I +CH3OH II +OH -SiO	SFR		1984 April 29
	+20 39 0.406582	+42 24 39.0256	-7599.27 mas	121174 mas	81.744874	0.591197		1	DR21EX					5.23	12830 (200)
6	+20 38 36.4345	+42 37 32.0887			81.870678	0.780164	G81.871+0.781		W75N	Image	Descr	4765 MHz;	4765	9.37 .. 13.9	170 .. 280	8.500	5.19 x 3.96	-79.8	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		1984 April 29
	+20 38 36.4431	+42 37 35.1892	130.411 mas	3101.23 mas	81.871378	0.780667		1	W75N					13.90	280 (30)
	+20 38 36.4232	+42 37 34.7881	-167.667 mas	2700.11 mas	81.871253	0.780647		2	W75N					9.37	170 (30)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Descr.	Line	Frequency	RMS	Beam	PA	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)				OH	(MHz)	(mJy)	(arcsec)	(deg.)	Yes/No
1	+06 12 53.4333	+18 00 11.6511	192.587359	-0.043584	G192.599-0.048	S255	Descr	4765 MHz;	4765	10.000	6.24 x 4.22	-66.2	+H2O +CH3OH I +CH3OH II +OH	SFR	1984 April 29

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