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XU09 - Absolute positions of 6.7-GHz methanol masers

Interferometry data

Short title: Xu et al. (2009)
Authors: Xu, Y.Voronkov, M. A.Pandian, J. D.Li, J. J.Sobolev, A. M.Brunthaler, A.Ritter, B.Menten, K. M.
Journal: Astronomy and Astrophysics, Volume 507, Issue 2, 2009, pp.1117-1139
Bibcode:

Target type: Known_Class_II
Transitions: CH3OH_6(II)

Abstract
The ATCA, MERLIN and VLA interferometers were used to measure the absolute positions of 35 6.7-GHz methanol masers to subarcsecond or higher accuracy. Our measurements represent essential preparatory data for Very Long Baseline Interferometry, which can provide accurate parallax and proper motion determinations of the star-forming regions harboring the masers. Our data also allow associations to be established with infrared sources at different wavelengths. Our findings support the view that the 6.7 GHz masers are associated with the earliest phases of high-mass star formation.

Abstract

The ATCA, MERLIN and VLA interferometers were used to measure the absolute positions of 35 6.7-GHz methanol masers to subarcsecond or higher accuracy. Our measurements represent essential preparatory data for Very Long Baseline Interferometry, which can provide accurate parallax and proper motion determinations of the star-forming regions harboring the masers. Our data also allow associations to be established with infrared sources at different wavelengths. Our findings support the view that the 6.7 GHz masers are associated with the earliest phases of high-mass star formation.

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Detection table from Xu et al. (2009)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_peak	F_peak	Telescope	Beam	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						CH₃OH (class II)	(km/s)	(Jy/beam)		(arcsec)	Yes/No		(kpc)	(kpc)
1	+18 05 25.66	-21 19 25.5			8.831531	-0.027984	G8.832-0.028		G8.832-0.028	Image		6.6 GHz (II);	-3.9	132	ATCA	0.5	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.100		2006 April
2	+18 07 15.32	-21 30 54.4			8.872097	-0.492638	G8.872-0.493		G8.872-0.493	Image	Descr	6.6 GHz (II);	23.4	30.9	ATCA	0.5	-H₂O -CH₃OH I +CH₃OH II -OH -SiO	SFR	3.600		2006 April
3	+18 15 45.8	-16 39 9.7			14.101327	0.087012	G14.101+0.087		G14.101+0.087	Image	Descr	6.6 GHz (II);	15.2	90.2	ATCA	0.5	+H₂O -CH₃OH I +CH₃OH II -OH	SFR	1.300		2006 April
	+18 15 45.8	-16 39 9.5	1.2 mas	198.4 mas	14.101376	0.087039		1	G14.101+0.087				5.9	15.4
	+18 15 45.81	-16 39 9.5	151.2 mas	198.4 mas	14.101395	0.087004		2	G14.101+0.087				10.1	25.1
	+18 15 45.81	-16 39 9.6	151.2 mas	98.4 mas	14.101370	0.086990		3	G14.101+0.087				11	22.8
	+18 15 45.8	-16 39 9.7	1.2 mas	-1.6 mas	14.101327	0.087012		4	G14.101+0.087				13.1	16.3
	+18 15 45.8	-16 39 9.7	1.2 mas	-1.6 mas	14.101327	0.087012		5	G14.101+0.087				13.6	22.6
4	+18 34 40.29	-09 00 38.1			23.009815	-0.410611	G23.010-0.410		G23.010-0.411	Image	Descr	6.6 GHz (II);	74.8	415.4	ATCA	0.5	+H₂O +CH₃OH I +CH₃OH II +OH		4.900		2006 April
	+18 34 40.29	-09 00 38.2	0 mas	-101.2 mas	23.009791	-0.410624		1	G23.010-0.411				72.7	43.4
	+18 34 40.28	-09 00 38.4	-150 mas	-301.2 mas	23.009722	-0.410613		2	G23.010-0.411				80.6	49.1
	+18 34 40.28	-09 00 38.4	-150 mas	-301.2 mas	23.009722	-0.410613		3	G23.010-0.411				81.6	52
	+18 34 40.27	-09 00 38.5	-300 mas	-401.2 mas	23.009679	-0.410589		4	G23.010-0.411				82.3	43.4
5	+18 34 55.2	-08 49 14.2			23.206714	-0.37761	G23.207-0.378		G23.207-0.378	Image	Descr	6.6 GHz (II);	81.7	38.2	ATCA	0.5	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	5.200		2006 April
	+18 34 55.21	-08 49 14.4	150 mas	-200.4 mas	23.206683	-0.377672		1	G23.207-0.378				76.5	19.4
	+18 34 55.21	-08 49 14.6	150 mas	-400.4 mas	23.206634	-0.377698		2	G23.207-0.378				77	35.4
6	+18 35 20.94	-07 48 55.6			24.147902	-0.009101	G24.148-0.009		G24.148-0.009	Image	Descr	6.6 GHz (II);	17.7	26.8	ATCA	0.5	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	2.000		2006 April
7	+18 35 8.14	-07 35 04			24.328649	0.144147	G24.329+0.144		G24.329+0.144	Image		6.6 GHz (II);	110.2	5	ATCA	0.5	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	6.600		2006 April
8	+18 40 3.72	-04 57 45.6			27.21979	0.260519	G27.220+0.260		G27.220+0.260	Image		6.6 GHz (II);	9.3	6.2	ATCA	0.5	+H₂O +CH₃OH II	SFR_MIXED	0.800		2006 April
9	+18 41 51.06	-05 01 42.8			27.365183	-0.165765	G27.367-0.165		G27.365-0.166	Image	Descr	6.6 GHz (II);	100	28	ATCA	0.5	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	5.900		2006 April
	+18 41 51.06	-05 01 42.8	-2e-07 mas	1.6 mas	27.365183	-0.165765		1	G27.365-0.166				98	10.2
	+18 41 51.06	-05 01 42.8	-2e-07 mas	1.6 mas	27.365183	-0.165765		2	G27.365-0.166				98.9	13.7
	+18 41 51.06	-05 01 42.8	-2e-07 mas	1.6 mas	27.365183	-0.165765		3	G27.365-0.166				100.7	14.2
	+18 41 51.06	-05 01 42.7	-2e-07 mas	101.6 mas	27.365208	-0.165752		4	G27.365-0.166				101.5	10.8
10	+18 45 59.57	-02 45 4.4			29.862891	-0.044025	G29.862-0.044		G29.863-0.044	Image	Descr	6.6 GHz (II);	101.4	76.5	ATCA	0.5	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	6.600		2006 April
	+18 45 59.57	-02 45 4.5	1.2 mas	-100.8 mas	29.862867	-0.044037		1	G29.863-0.044				100.3	52
	+18 45 59.57	-02 45 4.5	1.2 mas	-100.8 mas	29.862867	-0.044037		2	G29.863-0.044				101.7	54.2
11	+18 47 3.07	-02 30 33.6			30.198744	-0.168805	G30.199-0.169		G30.199-0.169	Image		6.6 GHz (II);	108.6	16	ATCA	0.5	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	6.900		2006 April
12	+18 47 8.3	-02 29 27.1			30.225116	-0.179749	G30.199-0.169		G30.225-0.180	Image		6.6 GHz (II);	113.5	10.8	ATCA	0.5	+H₂O -CH₃OH I +CH₃OH II +OH	SFR	7.000		2006 April
13	+18 47 9.13	-01 44 8.8			30.898592	0.16171	G30.898+0.161		G30.899+0.162	Image	Descr	6.6 GHz (II);	101.8	25.7	ATCA	0.5	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	6.900		2006 April
	+18 47 9.13	-01 44 8.7	-1.2 mas	100.8 mas	30.898616	0.161723		1	G30.899+0.162				103	14.2
14	+00 36 47.358	+63 29 2.18			121.297737	0.65868	G121.298+0.659		L1287	Image		6.6 GHz (II);	-23.2	7.5	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED			2007 Feb-Mar
15	+00 52 24.196	+56 33 43.17			123.065713	-6.309506	G123.066-6.309		NGC281 - N	Image		6.6 GHz (II);	-29.3	32.4	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II -OH	SFR_MIXED			2007 Feb-Mar
16	+05 39 13.066	+35 45 51.29			173.481698	2.446152	G173.482+2.446		S 231	Image		6.6 GHz (II);	-12.8	32.1	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			2007 Feb-Mar
17	+06 08 53.342	+21 38 29.09			188.946134	0.885983	G188.946+0.886		AFGL5180	Image		6.6 GHz (II);	10.7	194	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED			2007 Feb-Mar
18	+06 08 40.671	+21 31 6.89			189.029793	0.783508	G189.032+0.784		AFGL6366	Image		6.6 GHz (II);	8.8	1.6	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			2007 Feb-Mar
19	+06 12 54.006	+17 59 23.21			192.600254	-0.048047	G192.599-0.048		S 255	Image	Descr	6.6 GHz (II);	5.5	10	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED			2007 Feb-Mar
	+06 12 54.02	+17 59 23.27	210 mas	58.4 mas	192.600266	-0.047990		1	S 255				4.4	8.5
20	+06 14 37.051	+13 49 36.16			196.453987	-1.67736	G196.454-1.677		S 269	Image		6.6 GHz (II);	15.3	3.6	MERLIN	0.1	+H₂O -CH₃OH I +CH₃OH II +OH	SFR			2007 Feb-Mar
21	+18 58 13.053	+01 40 35.68			35.197026	-0.743219	G35.197-0.743		18556+0136	Image	Descr	6.6 GHz (II);	28.5	72.8	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.500		2007 Feb-Mar
22	+19 10 11.049	+09 05 20.49			43.149031	0.01307	G43.166+0.011		G43.15 + 0.02	Image		6.6 GHz (II);	13.4	6	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	0.200		2007 Feb-Mar
23	+19 14 26.393	+09 22 36.53			43.890432	-0.78442	G43.890-0.784		19120+0917	Image	Descr	6.6 GHz (II);	52	3	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	4.200		2007 Feb-Mar
	+19 14 26.392	+09 22 36.62	-15.6 mas	89.6 mas	43.890452	-0.784405		1	19120+0917				47.7	4.5
24	+19 20 59.212	+14 46 49.65			49.415631	0.325744	G49.416+0.326		19186+1440	Image	Descr	6.6 GHz (II);	-12.1	7	MERLIN	0.1	+H₂O -CH₃OH I +CH₃OH II +OH	SFR_MIXED			2007 Feb-Mar
25	+19 23 43.949	+14 30 34.44			49.489813	-0.387637	G49.489-0.387		W51e2	Image		6.6 GHz (II);	59.2	217	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR			2007 Feb-Mar
26	+19 32 36.071	+16 57 38.46			52.662669	-1.092046	G52.660-1.090		19303+1651	Image	Descr	6.6 GHz (II);	65.7	1.3	MERLIN	0.1	+H₂O +CH₃OH II -OH	SFR			2007 Feb-Mar
27	+20 10 9.047	+31 31 35.06			69.539903	-0.975642	G69.540-0.976		ON 1A	Image		6.6 GHz (II);	14.7	31	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.000		2007 Feb-Mar
28	+20 10 9.073	+31 31 35.94			69.540158	-0.975586	G69.540-0.976		ON 1B	Image		6.6 GHz (II);	-0.1	8.8	MERLIN	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	2.000		2007 Feb-Mar
29	+20 30 50.673	+41 02 27.55			79.735705	0.99045	G79.736+0.990		20290+4052	Image	Descr	6.6 GHz (II);	-5.2	18.2	MERLIN	0.1	+H₂O -CH₃OH I +CH₃OH II -OH	SFR			2007 Feb-Mar
30	+21 39 58.263	+50 14 20.96			94.602498	-1.796117	G94.603-1.796		21381+5000	Image	Descr	6.6 GHz (II);	-40.7	4.2	MERLIN	0.1	+H₂O -CH₃OH I +CH₃OH II -OH -SiO	SFR_MIXED			2007 Feb-Mar
	+21 39 58.262	+50 14 21.05	-16.8 mas	88.4 mas	94.602513	-1.796096		1	21381+5000				-43.6	4
31	+22 28 51.408	+64 13 41.3			108.184412	5.518741	G108.186+5.518		L1206	Image		6.6 GHz (II);	-11	29.4	MERLIN	0.1	-H₂O -CH₃OH I +CH₃OH II -OH	SFR			2007 Feb-Mar
32	+20 37 0.96	+41 34 55.74			80.861489	0.383305	G80.861+0.383		DR20	Image		6.6 GHz (II);	-4.44	1.24	NRAOVLA	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1.000		2009 January 27
33	+20 38 36.428	+42 37 34.82			81.871269	0.780641	G81.871+0.781		W75	Image		6.6 GHz (II);	6.76	152.28	NRAOVLA	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED			2009 January 27
34	+20 39 1.989	+42 24 59.3			81.752305	0.590759	G81.764+0.596		DR21B 1	Image		6.6 GHz (II);	-9.07	4	NRAOVLA	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			2009 January 27
35	+20 39 1.057	+42 22 49.18			81.72187	0.57105	G81.713+0.567		DR21 B_2	Image		6.6 GHz (II);	-3.03	2.65	NRAOVLA	0.1	+H₂O +CH₃OH I +CH₃OH II +OH -SiO	SFR			2009 January 27
36	+20 39 0.374	+42 24 37.13			81.744395	0.590956	G81.764+0.596		DR21 B_3	Image		6.6 GHz (II);	3.56	3.16	NRAOVLA	0.1	+H₂O +CH₃OH I +CH₃OH II +OH	SFR			2009 January 27

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(met2_data_all.ra_hms) as ra_hms,MAX(met2_data_all.dec_dms) as dec_dms,MAX(met2_data_all.source_name) as source_name,MAX(met2_data_all.ra) as ra,MAX(met2_data_all.dec) as dec,MAX(met2_data_all.l) as l,MAX(met2_data_all.b) as b,MAX(met2_data_all.grp) as grp,MAX(met2_data_all.other_name) as other_name,MAX(met2_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met2_data_all.line) as line,MAX(met2_data_all.vrange) as vrange,MAX(met2_data_all.vpeak) as vpeak,MAX(met2_data_all.peak) as peak,MAX(met2_data_all.fwhm) as fwhm,MAX(met2_data_all.int) as int,MAX(met2_data_all.rms) as rms,MAX(met2_data_all.units) as units,MAX(met2_data_all.units_rms) as units_rms,MAX(met2_data_all.date_txt) as date_txt,MAX(met2_data_all.telescope_ref) as telescope_ref,MAX(met2_data_all.telescope_conf) as telescope_conf,MAX(met2_data_all.v_step) as v_step,MAX(met2_data_all.beam) as beam,MAX(met2_data_all.beam_maj) as beam_maj,MAX(met2_data_all.beam_min) as beam_min,MAX(met2_data_all.beam_pa) as beam_pa,MAX(met2_data_all.ref) as ref,MAX(met2_data_all.list_ref) as list_ref,MAX(met2_data_all.ascii) as ascii,MAX(met2_data_all.url) as url,MAX(met2_data_all.image) as image,MAX(met2_data_all.image2) as image2,MAX(met2_data_all.image3) as image3,MAX(met2_data_all.descr) as descr,MAX(met2_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met2_data_all.dist) as dist,1 as dist_parallax,MAX(met2_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 met2_data_all  LEFT JOIN all_objects_withmet ON met2_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 met2_data_all.line=transitions."Line"  WHERE ref ilike 'XU09' AND detected=true AND hide=false GROUP BY ref

select met2_data_all.ra_hms,met2_data_all.dec_dms,met2_data_all.source_name,met2_data_all.ra,met2_data_all.dec,met2_data_all.l,met2_data_all.b,met2_data_all.grp,met2_data_all.other_name,met2_data_all.other_desc,met2_data_all.thermal,met2_data_all.line,met2_data_all.vrange,met2_data_all.vpeak,met2_data_all.peak,met2_data_all.fwhm,met2_data_all.int,met2_data_all.rms,met2_data_all.units,met2_data_all.units_rms,met2_data_all.date_txt,met2_data_all.telescope_ref,met2_data_all.telescope_conf,met2_data_all.v_step,met2_data_all.beam,met2_data_all.beam_maj,met2_data_all.beam_min,met2_data_all.beam_pa,met2_data_all.ref,met2_data_all.list_ref,met2_data_all.ascii,met2_data_all.url,met2_data_all.image,met2_data_all.image2,met2_data_all.image3,met2_data_all.descr,met2_data_all.id,met2_data_all.mjy_flag,met2_data_all.rms_mjy_flag,met2_data_all.dist,met2_data_all.dist_parallax,met2_data_all.date_txt,line_det,type,simbad_types_cat FROM met2_data_all   LEFT JOIN all_objects_withmet ON met2_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 met2_data_all.line=transitions."Line"  WHERE ref ilike 'XU09' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

XU09 - Absolute positions of 6.7-GHz methanol masers

Interferometry data

View as list of objects

Detection table from Xu et al. (2009)