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HAS90 - Detection of widespread strong methanol masers at 44 GHz

Short title: Haschick et al. (1990)
Authors: Haschick, Aubrey D. Menten, Karl M. Baan, Willem A.
Journal: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 10, 1990, p. 556-567.
Bibcode:

Target type: High_mass_SFR

Abstract
The Haystack Observatory 37-m antenna was used to search for emission from the 44 GHz 7(0)-6(1)A(+) transition of interstellar methanol toward 50 galactic star-forming regions. The line was detected toward half the observed sources. Several of these regions were also observed in the 36 GHz 4(-1)-3(0)E line. In most sources, the detected emission shows one or more narrow components indicating maser action. The spectral appearance and spatial distribution of these methanol masers closely resembles the properties of the well-studied 25 GHz methanol masers: in some cases, distances between individual methanol maser components are of order 1 pc. Unlike the now well-studied 12 GHz methanol masers, these masers appear well separated from OH/H2O maser centers and compact H II regions.

Abstract

The Haystack Observatory 37-m antenna was used to search for emission from the 44 GHz 7(0)-6(1)A(+) transition of interstellar methanol toward 50 galactic star-forming regions. The line was detected toward half the observed sources. Several of these regions were also observed in the 36 GHz 4(-1)-3(0)E line. In most sources, the detected emission shows one or more narrow components indicating maser action. The spectral appearance and spatial distribution of these methanol masers closely resembles the properties of the well-studied 25 GHz methanol masers: in some cases, distances between individual methanol maser components are of order 1 pc. Unlike the now well-studied 12 GHz methanol masers, these masers appear well separated from OH/H2O maser centers and compact H II regions.

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Detection table from Haschick et al. (1990)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Other name	Line	V_peak	FWHM	∫F dv	List	Beam	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)		Comp	CH₃OH (class I)	(km/s)	(km/s)	(Jy*km/s)		(arcsec)	Yes/No		(kpc)
1	06 12 56.4	+17 59 53.8	192.5974	-0.0355	G192.599-0.048		44 GHz (I);	11.18	0.57	17.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
2	20 10 9.1	+31 31 37.4	69.5406	-0.9756	G69.540-0.976		44 GHz (I);	11.42	0.49	11.70	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	20 10 9.1	+31 31 37.4	69.5406	-0.9756	G69.540-0.976		44 GHz (I);	12.04	0.28	11.70	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
4	19 10 13.4	+09 06 14.4	43.1668	0.0114	G43.166+0.011		44 GHz (I);	14.0	4.1	43.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	19 10 13.4	+09 06 14.4	43.1668	0.0114	G43.166+0.011		44 GHz (I);	15.57	0.48	43.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
6	17 45 38.2	-29 03 27.7	359.8982	-0.0664	G359.8928-0.0671		44 GHz (I);	21	14	200.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II	SFR_MIXED		HAS90
7	18 14 11.1	-17 55 57.4	12.7968	-0.1928	G12.797-0.193	W33Met	44 GHz (I);	32.64	0.63	76.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
	18 14 11.1	-17 55 57.4	12.7968	-0.1928	G12.797-0.193	W33Met	44 GHz (I);	36.28	1.3	76.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
9	18 06 19.3	-21 37 37.9	8.6684	-0.3576	G8.669-0.356		44 GHz (I);	33.92	1.5	108.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	18 06 19.3	-21 37 37.9	8.6684	-0.3576	G8.669-0.356		44 GHz (I);	35.71	1.3	108.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	18 06 19.3	-21 37 37.9	8.6684	-0.3576	G8.669-0.356		44 GHz (I);	37.73	1.2	108.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	18 06 19.3	-21 37 37.9	8.6684	-0.3576	G8.669-0.356		44 GHz (I);	35.71	1.3	68.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
13	18 14 11.1	-17 55 57.4	12.7968	-0.1928	G12.797-0.193		44 GHz (I);	36.28	1.3	29.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
14	18 06 19.3	-21 37 37.9	8.6684	-0.3576	G8.669-0.356		44 GHz (I);	37.73	1.2	21.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
15	17 45 52	-28 59 26.7	359.9815	-0.0745	G359.9815-0.0745		44 GHz (I);	44.5	12.5	332.00	AVE02	50	+CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
	17 45 52	-28 59 26.7	359.9815	-0.0745	G359.9815-0.0745		44 GHz (I);	47.19	0.42	332.00	AVE02	50	+CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
	17 45 52	-28 59 26.7	359.9815	-0.0745	G359.9815-0.0745		44 GHz (I);	47.19	0.42	20.00	AVE02	50	+CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
18	19 23 43.9	+14 30 39.4	49.4909	-0.3867	G49.489-0.387	e1/e2	44 GHz (I);	48.88	1.17	126.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	19 23 43.9	+14 30 39.4	49.4909	-0.3867	G49.489-0.387	e1/e2	44 GHz (I);	55.4	7.2	126.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
20	19 23 46.5	+14 29 40.6	49.4815	-0.4037	G49.489-0.387	Met2	44 GHz (I);	52.37	0.60	42.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	19 23 46.5	+14 29 40.6	49.4815	-0.4037	G49.489-0.387	Met2	44 GHz (I);	54.04	0.61	42.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	19 23 46.5	+14 29 40.6	49.4815	-0.4037	G49.489-0.387	Met2	44 GHz (I);	56.67	0.37	42.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
23	19 23 45.2	+14 29 45.5	49.4802	-0.3984	G49.489-0.387	Met3	44 GHz (I);	53.95	1.2	29.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	19 23 45.2	+14 29 45.5	49.4802	-0.3984	G49.489-0.387	Met3	44 GHz (I);	56.63	0.46	29.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
25	19 23 43.9	+14 29 25.4	49.4728	-0.3965	G49.489-0.387	Met1	44 GHz (I);	56.0	1.1	16.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
26	18 53 18.6	+01 14 57.7	34.2572	0.1532	G34.257+0.153		44 GHz (I);	56.4	1.0	36.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
	18 53 18.6	+01 14 57.7	34.2572	0.1532	G34.257+0.153		44 GHz (I);	58.26	1.3	36.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
28	17 47 20.4	-28 23 7.3	0.6667	-0.0363	G0.6665-0.0349		44 GHz (I);	63	20	390.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II -OH			HAS90
	17 47 20.4	-28 23 7.3	0.6667	-0.0363	G0.6665-0.0349		44 GHz (I);	63	20	390.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II -OH			HAS90
30	19 23 43.2	+14 31 34.4	49.5031	-0.3772	G49.489-0.387	Met4	44 GHz (I);	64.4	2.6	48.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
31	19 23 38.2	+14 30 05	49.4716	-0.3709	G49.489-0.387	Met5	44 GHz (I);	66.72	0.29	14.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
32	06 41 9.7	+09 29 34.9	203.3155	2.0549	G203.316+2.055		44 GHz (I);	7.24	0.21	107.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
	06 41 9.7	+09 29 34.9	203.3155	2.0549	G203.316+2.055		44 GHz (I);	7.52	0.46	107.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
34	20 38 36.8	+42 37 59.5	81.8775	0.7838	G81.871+0.781	(N)	44 GHz (I);	8.92	0.32	23.10	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
35	18 47 47	-01 54 35.1	30.8157	-0.0580	G30.818-0.057		44 GHz (I);	95.15	1.4	228.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	18 47 47	-01 54 35.1	30.8157	-0.0580	G30.818-0.057		44 GHz (I);	96.81	0.9	228.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	18 47 47	-01 54 35.1	30.8157	-0.0580	G30.818-0.057		44 GHz (I);	99.19	3	228.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	18 47 47	-01 54 35.1	30.8157	-0.0580	G30.818-0.057		44 GHz (I);	102.43		228.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
39	05 40 53.3	+35 41 48.8	173.7188	2.6980	G173.719+2.698		44 GHz (I);	-16.38	0.74	61.40	AVE02	50	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		HAS90
	05 40 53.3	+35 41 48.8	173.7188	2.6980	G173.719+2.698		44 GHz (I);	-17	0.17	61.40	AVE02	50	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		HAS90
41	20 38 54.6	+42 19 23.5	81.6644	0.5521	G81.713+0.567	West	44 GHz (I);	-2.47	0.35	132.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	20 38 54.6	+42 19 23.5	81.6644	0.5521	G81.713+0.567	West	44 GHz (I);	-1.95	1.6	132.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	20 38 54.6	+42 19 23.5	81.6644	0.5521	G81.713+0.567	West	44 GHz (I);	-1.5	0.22	132.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
44	20 39 00	+42 19 27.8	81.6755	0.5396	G81.713+0.567		44 GHz (I);	-3.8	2.6	24.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
45	20 39 0.7	+42 22 50.8	81.7216	0.5722	G81.713+0.567		44 GHz (I);	-4.8	1.9	329.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	20 39 0.7	+42 22 50.8	81.7216	0.5722	G81.713+0.567		44 GHz (I);	-1.1	2.6	329.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
	20 39 0.7	+42 22 50.8	81.7216	0.5722	G81.713+0.567		44 GHz (I);	0.36	0.66	329.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
48	02 27 4.7	+61 52 25.5	133.9488	1.0651	G133.947+1.064		44 GHz (I);	-46.49	0.8	4.20	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
49	23 13 44.8	+61 26 50.7	111.5330	0.7567	G111.542+0.766		44 GHz (I);	-55.6	5.2	63.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90
50	17 20 53.3	-35 47 1.5	351.4168	0.6453	G351.417+0.645		44 GHz (I);	-6.1	5.4	150.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		HAS90
51	22 19 18.3	+63 18 48.3	106.7972	5.3122	G106.797+5.312		44 GHz (I);	-8.22	0.7	12.00	AVE02	50	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		HAS90

Non-detection table from Haschick et al. (1990)