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CAS95B - Methanol and hydroxyl maser positions

Short title: Caswell et al. (1995B)
Authors: Caswell, J. L.Vaile, R. A.Forster, J. R.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 1, pp. 210-216.
Bibcode:
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1665,CH3OH_6(II)

Abstract
The Australia Telescope Compact Array has been used to study more than 40 sites of 1.665-GHz hydroxyl masers and 36 sites of 6.668-GHz methanol masers. Maser positions accurate to better than 1 arcsec have been derived. At each maser site both species are commonly present, and comparisons have been made between the methanol and OH. In 28 of the 29 cases where we have accurate measurements of both species, the methanol and OH coincide to within the errors, with nominal separations of less than 1.4 arcsec. In only one case do the two species apparently arise from different sites, the separation in this instance exceeding 3 arcsec. 1.665-GHz OH masers are known to be excellent indicators of the sites of ultra-compact HII regions which envelop recently formed massive stars; our results confirm with high accuracy that masers of 1.665-GHz OH and 6.6-GHz methanol generally pinpoint identical HII regions. Thus the same evolutionary phase of the HII region is conducive to both OH and methanol maser emission. We briefly discuss the precise distribution of the masing molecules relative to the embedded star and its HII region, but this requires further study.

Abstract

The Australia Telescope Compact Array has been used to study more than 40 sites of 1.665-GHz hydroxyl masers and 36 sites of 6.668-GHz methanol masers. Maser positions accurate to better than 1 arcsec have been derived. At each maser site both species are commonly present, and comparisons have been made between the methanol and OH. In 28 of the 29 cases where we have accurate measurements of both species, the methanol and OH coincide to within the errors, with nominal separations of less than 1.4 arcsec. In only one case do the two species apparently arise from different sites, the separation in this instance exceeding 3 arcsec. 1.665-GHz OH masers are known to be excellent indicators of the sites of ultra-compact HII regions which envelop recently formed massive stars; our results confirm with high accuracy that masers of 1.665-GHz OH and 6.6-GHz methanol generally pinpoint identical HII regions. Thus the same evolutionary phase of the HII region is conducive to both OH and methanol maser emission. We briefly discuss the precise distribution of the masing molecules relative to the embedded star and its HII region, but this requires further study.

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Detection table from Caswell et al. (1995B)

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ID	Obs. RA	Obs. Dec	l	b	Group id	grpv	Source name	Descr.	Line	Frequency	V_peak	F_peak	Telescope	Configuration	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	13 11 13.8	-62 34 41.2	305.2084	0.2061	G305.208+0.206	G305.2049+0.2062	305.21+0.21	Descr	1665 MHz;	1665	-38.0	15.9	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
2	13 11 10.6	-62 34 38	305.2024	0.2075	G305.208+0.206	G305.2049+0.2062	305.20+0.21	Descr	1665 MHz;	1665	-42.5	0.67	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
3	13 12 35.9	-62 37 17.9	305.3619	0.1502	G305.362+0.150	G305.3619+0.1502	305.36+0.15		1665 MHz;	1665	-39.5	7.6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	SFR		1993 Feb 2, 6
4	13 43 1.7	-62 08 52.1	308.9176	0.1229	G308.918+0.123	G308.9180+0.1228	308.92+0.12		1665 MHz;	1665	-54.0	50	ATCA	6-km	0.72	0.040	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
5	13 50 41.8	-61 35 9.7	309.9206	0.4790	G309.921+0.479	G309.9205+0.4789	309.92+0.48		1665 MHz;	1665	-60.0	27.6	ATCA	6-km	0.72	0.040	7	-H₂O +CH₃OH II +OH	SFR		1993 Feb 2, 6
6	14 43 23.4	-60 13 0.2	316.4120	-0.3083	G316.412-0.308	G316.4119-0.3084	316.41-0.31		1665 MHz;	1665	-7.5	0.17	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
7	14 44 18.3	-59 55 11.5	316.6402	-0.0867	G316.640-0.087	G316.6404-0.0866	316.64-0.09		1665 MHz;	1665	-21.5	0.6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	SFR		1993 Feb 2, 6
8	15 00 55.4	-58 58 52.6	318.9479	-0.1961	G318.948-0.196	G318.9478-0.1962	318.95-0.20		1665 MHz;	1665	-35.5	41.5	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
9	15 18 34.6	-56 38 25.6	322.1582	0.6360	G322.161+0.635	G322.1596+0.6353	322.16+0.64	Descr	1665 MHz;	1665	-61.0	0.59	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
10	15 31 45.6	-56 30 51.3	323.7401	-0.2631	G323.740-0.263	G323.7401-0.2628	323.74-0.26		1665 MHz;	1665	-55.5	0.6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
11	15 57 58.3	-53 59 22.3	328.2366	-0.5472	G328.237-0.547	G328.2366-0.5475	328.24-0.55		1665 MHz;	1665	-41.0	5	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
12	15 57 59.8	-53 57 59.4	328.2544	-0.5321	G328.237-0.547	G328.2542-0.5321	328.25-0.53		1665 MHz;	1665	-37.0	12.6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
13	15 55 48.6	-52 43 5.5	328.8087	0.6331	G328.809+0.633	G328.8087+0.6330	328.81+0.63		1665 MHz;	1665	-43.5	54.2	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
14	16 00 31.8	-53 12 49.9	329.0294	-0.2048	G329.031-0.200	G329.0295-0.2049	329.03-0.21	Descr	1665 MHz;	1665	-38.5	7.4	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
15	16 00 30.3	-53 12 27.9	329.0307	-0.1979	G329.031-0.200	G329.0308-0.1978	329.03-0.20	Descr	1665 MHz;	1665	-44.5	1	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
16	16 00 30.4	-53 12 35	329.0295	-0.1995	G329.031-0.200	G329.0308-0.1978	329.03-0.20s		1665 MHz;	1665	-38.5	3	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
17	16 01 9.9	-53 16 02	329.0664	-0.3074	G329.066-0.308	G329.0663-0.3076	329.07-0.31	Descr	1665 MHz;	1665	-43.0	1.2	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
18	16 11 26.6	-51 41 56.5	331.2782	-0.1881	G331.278-0.188	G331.2782-0.1881	331.28-0.19		1665 MHz;	1665	-86.0	8.9	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
19	16 21 20.2	-50 09 48.1	333.4661	-0.1642	G333.466-0.164	G333.4660-0.1643	333.47-0.16		1665 MHz;	1665	-43.5	4	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
20	16 30 57.3	-48 43 39.9	335.5851	-0.2847	G335.585-0.289	G335.5851-0.2847	335.59-0.28	Descr	1665 MHz;	1665	-47.5	1.8	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
21	16 30 58.6	-48 43 50.7	335.5854	-0.2894	G335.585-0.289	G335.5854-0.2897	335.59-0.29	Descr	1665 MHz;	1665	-53.0	2.4	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
22	16 29 47.4	-48 15 51.2	335.7892	0.1741	G335.789+0.174	G335.7890+0.1741	335.79+0.17	Descr	1665 MHz;	1665	-53.0	0.32	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
23	16 38 29.7	-47 00 35.3	337.7054	-0.0531	G337.705-0.053	G337.7053-0.0532	337.71-0.05	Descr	1665 MHz;	1665	-49.0	21.1	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
24	16 51 6.2	-46 15 57.8	339.6816	-1.2072	G339.681-1.207	G339.6812-1.2072	339.68-1.21	Descr	1665 MHz;	1665	-23.0	2.3	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	SFR		1993 Feb 2, 6
25	16 51 6.2	-46 15 59.8	339.6812	-1.2076	G339.681-1.207	G339.6812-1.2072	339.68-1.21		1665 MHz;	1665	-25.0	2.1	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	SFR		1993 Feb 2, 6
26	16 52 4.6	-46 08 33.6	339.8841	-1.2586	G339.884-1.259	G339.8840-1.2589	339.88-1.26		1665 MHz;	1665	-35.0	9.9	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
27	16 50 14.8	-44 42 26.8	340.7849	-0.0960	G340.785-0.096	G340.7850-0.0960	340.78-0.10		1665 MHz;	1665	-101.0	6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
28	16 52 17.8	-44 26 52.5	341.2176	-0.2118	G341.218-0.212	G341.2177-0.2119	341.22-0.21	Descr	1665 MHz;	1665	-37.0	3.6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
29	17 04 7.8	-42 18 39.5	344.2275	-0.5687	G344.228-0.569	G344.2275-0.5687	344.23-0.57	Descr	1665 MHz;	1665	-30.5	1.6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
30	17 02 57.7	-41 41 53.5	344.5815	-0.0235	G344.582-0.024	G344.5816-0.0235	344.58-0.02		1665 MHz;	1665	-2.5	25.9	ATCA	6-km	0.72	0.040	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
31	16 56 47.6	-40 14 25.2	345.0096	1.7925	G345.010+1.792	G345.0097+1.7924	345.01+1.79		1665 MHz;	1665	-22.5	12.1	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
32	17 04 22.9	-40 44 22.9	345.5044	0.3482	G345.505+0.348	G345.5046+0.3481	345.50+0.35	Descr	1665 MHz;	1665	-19.5	9.8	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
33	17 06 50.6	-40 50 59.6	345.6982	-0.0897	G345.698-0.090	G345.6982-0.0898	345.70-0.09	Descr	1665 MHz;	1665	-6.0	8.7	ATCA	6-km	0.72	0.040	7	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
34	17 19 20.4	-39 03 51.8	348.5497	-0.9788	G348.550-0.979	G348.5498-0.9788	348.55-0.98	Descr	1665 MHz;	1665	-19.5	4.3	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
35	17 15 50.2	-38 10 12.2	348.8846	0.0964	G348.885+0.096	G348.8846+0.0965	348.88+0.10		1665 MHz;	1665	-73.0	1.5	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	EVOLVED		1993 Feb 2, 6
36	17 17 0.2	-38 19 27.7	348.8919	-0.1798	G348.892-0.180	G348.8917-0.1799	348.89-0.18		1665 MHz;	1665	9.5	1.29	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	SFR		1993 Feb 2, 6
37	17 16 50.7	-38 05 14.1	349.0673	-0.0173	G349.067-0.017	G349.0672-0.0173	349.07-0.02		1665 MHz;	1665	15.0	1.67	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
38	17 16 24.6	-37 59 45.4	349.0920	0.1056	G349.092+0.106	G349.0919+0.1055	349.09+0.11		1665 MHz;	1665	-80.5	3.5	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
39	17 25 25.2	-36 12 44.7	351.5815	-0.3531	G351.581-0.353	G351.5814-0.3532	351.58-0.35		1665 MHz;	1665	-97.5	2.6	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
40	17 26 42.6	-36 09 17	351.7748	-0.5364	G351.775-0.536	G351.7746-0.5364	351.77-0.54	Descr	1665 MHz;	1665	-2.0	240	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
41	17 30 26.2	-34 41 45.3	353.4099	-0.3601	G353.410-0.360	G353.4099-0.3602	353.41-0.36	Descr	1665 MHz;	1665	-19.5	9.1	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
42	17 30 17.1	-33 13 54.2	354.6149	0.4722	G354.615+0.472	G354.6149+0.4721	354.61+0.47	Descr	1665 MHz;	1665	-15.0	4.9	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1993 Feb 2, 6
43	17 50 14.5	-28 54 31.5	0.5463	-0.8516	G0.5464-0.8516	G0.5463-0.8516	0.55-0.85	Descr	1665 MHz;	1665	13.0	2.2	ATCA	6-km	0.72	0.040	7	+OH	SFR_MIXED		1993 Feb 2, 6
44	18 08 44.9	-19 54 38.9	10.4440	-0.0184	G10.472+0.027	G10.4442-0.0182	10.44-0.02	Descr	1665 MHz;	1665	75.5	1.35	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR		1993 Feb 2, 6
45	18 08 38.2	-19 51 49.2	10.4725	0.0274	G10.472+0.027	G10.4723+0.0272	10.47+0.03	Descr	1665 MHz;	1665	52.0	0.86	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR		1993 Feb 2, 6
46	18 08 37.8	-19 51 15.9	10.4798	0.0332	G10.472+0.027	G10.4799+0.0330	10.48+0.03	Descr	1665 MHz;	1665	66.5	0.52	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR		1993 Feb 2, 6
47	18 13 54.8	-18 01 47.5	12.6805	-0.1826	G12.681-0.182	G12.6806-0.1823	12.68-0.18	Descr	1665 MHz;	1665	64.5	10	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6
48	18 14 39.5	-17 52 1.1	12.9083	-0.2605	G12.908-0.260	G12.9084-0.2602	12.91-0.26	Descr	1665 MHz;	1665	38.5	27	ATCA	6-km	0.72	0.040	7	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 Feb 2, 6

DSS colored	2MASS colored	WISE colored
PACS color (70-160 um)	SPIRE color (250-500 um)	GLIMPSE 360
SDSS color	IRAC color I1,I2,I4	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.grpv) as grpv,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.line) as line,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.pol) as pol,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM oh_data_all  LEFT JOIN all_objects_withmet ON oh_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON oh_data_all.line=transitions."Line"  WHERE ref ilike 'CAS95B' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.grpv,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.line,oh_data_all.freq,oh_data_all.pol,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON oh_data_all.line=transitions."Line"  WHERE ref ilike 'CAS95B' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

CAS95B - Methanol and hydroxyl maser positions

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Detection table from Caswell et al. (1995B)