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KOG98 - VLA Imaging of Class I Methanol Masers at 7 Millimeters with Angular Resolution approximately 0.2 Arcseconds

Interferometry data

Short title: Kogan & Slysh (1998)
Authors: Kogan, L. Slysh, V.
Journal: The Astrophysical Journal, Volume 497, Issue 2, pp. 800-806.
Bibcode:

Target type: High_mass_SFR
Transitions: CH3OH_44(I)

Abstract
Eight class I methanol masers [DR21(OH), DR21W, OMC-2, NGC 2264, M8E, NGC 6334I(N), L379, W33Met] in the transition 7₀-6₁A⁺ at 44069 MHz were imaged with angular resolution ~0.2 arcsec with the VLA.2 The images show a different distribution of maser spots from a simple structure of one or two spots at NGC 2264, M8E, DR21W, to a very complex structure of many spots at DR21(OH) (17 spots), OMC-2 (8 spots), NGC 6364I(N) (23 spots), L379 (11 spots), and W33Met (5 spots). Some spots are partially resolved, but the majority of them are still unresolved. The maximum brightness temperatures of the methanol (44,069 MHz) emission features at the observed sources ranges from 1.9 � 10⁶ to 3.6 � 10⁸ K. The velocity range varies from the minimum 0.8 km s^-1 at NGC 2264 to the maximum 6.9 km s^-1 at DR21(OH).

Abstract

Eight class I methanol masers [DR21(OH), DR21W, OMC-2, NGC 2264, M8E, NGC 6334I(N), L379, W33Met] in the transition 7₀-6₁A⁺ at 44069 MHz were imaged with angular resolution ~0.2 arcsec with the VLA.2 The images show a different distribution of maser spots from a simple structure of one or two spots at NGC 2264, M8E, DR21W, to a very complex structure of many spots at DR21(OH) (17 spots), OMC-2 (8 spots), NGC 6364I(N) (23 spots), L379 (11 spots), and W33Met (5 spots). Some spots are partially resolved, but the majority of them are still unresolved. The maximum brightness temperatures of the methanol (44,069 MHz) emission features at the observed sources ranges from 1.9 � 10⁶ to 3.6 � 10⁸ K. The velocity range varies from the minimum 0.8 km s^-1 at NGC 2264 to the maximum 6.9 km s^-1 at DR21(OH).

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Detection table from Kogan & Slysh (1998)

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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	Major	Minor	PA	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						CH₃OH (class I)	(km/s)	(Jy)	(arcsec)	(arcsec)	(deg.)		Yes/No		(kpc)
1	20 38 59.2	+42 22 49.1			81.718448	0.575461	G81.713+0.567		DR21(OH)	Image	Descr	44 GHz (I);	0.07 .. -5.75	8 .. 452				NRAOVLA	+H₂O +OH	SFR		1995 July 13
	+20 38 59.244	+42 22 49.098	0 mas	40 mas	81.718457	0.575467		1	DR21(OH) A				0.33	452	0.270	0.070	2.000
	+20 38 59.254	+42 22 49.278	150 mas	220 mas	81.718515	0.575473		2	DR21(OH) B				0.33	134	0.310	0.150	114.000
	+20 38 59.276	+42 22 49.888	480 mas	830 mas	81.718691	0.575522		3	DR21(OH) C				0.16	15	0.070	0.040	136.000
	+20 38 59.277	+42 22 47.798	500 mas	-1260 mas	81.718232	0.575166		4	DR21(OH) D				-1.25	14	0.390	0.030	112.000
	+20 38 59.685	+42 22 46.248	6620 mas	-2810 mas	81.718654	0.573907		5	DR21(OH) E				-0.5	20	0.170	0.070	144.000
	+20 38 59.713	+42 22 45.508	7040 mas	-3550 mas	81.718544	0.573714		6	DR21(OH) F				0.16	18	0.460	0.010	146.000
	+20 38 59.728	+42 22 45.178	7260 mas	-3880 mas	81.718498	0.573622		7	DR21(OH) G				0.16	21	0.280	0.070	143.000
	+20 38 59.906	+42 22 47.988	9930 mas	-1070 mas	81.719451	0.573662		8	DR21(OH) H				-1.66	15	0.180	0.070	25.000
	+20 38 59.962	+42 22 46.228	10770 mas	-2830 mas	81.719168	0.573228		9	DR21(OH) I				0.07	65	0.330	0.160	110.000
	+20 38 59.982	+42 22 47.648	11080 mas	-1410 mas	81.719520	0.573417		10	DR21(OH) J				0.08	29	0.310	0.170	107.000
	+20 39 1.481	+42 22 41.028	33560 mas	-8030 mas	81.720866	0.568638		11	DR21(OH) K				-4.91	27	0.200	0.040	59.000
	+20 39 1.979	+42 22 41.418	41030 mas	-7640 mas	81.721884	0.567487		12	DR21(OH) L				-4.58	13	0.290	0.070	30.000
	+20 39 1.981	+42 22 40.968	41060 mas	-8090 mas	81.721789	0.567406		13	DR21(OH) M				-5.75	8	0.160	0.030	31.000
	+20 39 2.038	+42 22 45.418	41920 mas	-3640 mas	81.722877	0.568018		14	DR21(OH) N				-3.56	24	0.080	0.060	-56.000
	+20 39 2.174	+42 22 44.568	43960 mas	-4490 mas	81.722944	0.567542		15	DR21(OH) O				-4.83	19	0.120	0.050	-42.000
	+20 39 2.182	+42 22 42.718	44080 mas	-6340 mas	81.722551	0.567210		16	DR21(OH) P				-3.64	9	0.310	0.170	-76.000
	+20 39 2.2	+42 22 44.238	44340 mas	-4820 mas	81.722919	0.567424		17	DR21(OH) Q				-5.24	56	0.300	0.170	-71.000
2	20 38 54.8	+42 19 22.5			81.664587	0.551422	G81.713+0.567		DR21W	Image	Descr	44 GHz (I);	-1.3 .. -2.5	4.4 .. 96				NRAOVLA	+H₂O +OH	SFR		1995 July 13
	+20 38 54.805	+42 19 22.512	0 mas	0 mas	81.664587	0.551422		1	DR21W A				-2.3	96	0.210	0.150	78.000
	+20 38 54.815	+42 19 22.342	140 mas	-170 mas	81.664567	0.551371		2	DR21W B				-1.3	28	0.500	0.100	152.000
	+20 38 54.822	+42 19 21.862	250 mas	-650 mas	81.664475	0.551272		3	DR21W C				-1.3	4.4	0.200	0.140	90.000
	+20 38 54.845	+42 19 20.612	600 mas	-1900 mas	81.664243	0.551003		4	DR21W D				-2.25	9.3	0.070	0.045	100.000
	+20 38 54.872	+42 19 19.812	1000 mas	-2700 mas	81.664117	0.550803		5	DR21W E				-2.5	73	0.210	0.160	78.000
3	05 35 27.1	-05 09 52.5			208.819267	-19.242691	G208.816-19.239		OMC-2	Image		44 GHz (I);	11.15 .. 11.9	4 .. 412				NRAOVLA	+H₂O +CH₃OH I +CH₃OH II	SFR_MIXED		1996 February 3
	+05 35 26.72	-05 10 2.093	-6000 mas	-9630 mas	208.820995	-19.245383		1	OMC-2 A				11.55	22	0.230	0.140	135.000
	+05 35 26.786	-05 10 1.553	-5000 mas	-9090 mas	208.820987	-19.245069		2	OMC-2 B				11.55	32	1.180	0.270	76.000
	+05 35 26.96	-05 09 56.893	-2400 mas	-4430 mas	208.820110	-19.243841		3	OMC-2 C				11.9	4	0.960	0.250	78.000
	+05 35 27.053	-05 09 55.313	-1000 mas	-2850 mas	208.819882	-19.243296		4	OMC-2 D				11.85	9	1.160	0.290	76.000
	+05 35 27.12	-05 09 52.483	0 mas	-20 mas	208.819272	-19.242693		5	OMC-2 E				11.5	412	0.400	0.210	75.000
	+05 35 27.13	-05 09 52.003	150 mas	460 mas	208.819166	-19.242596		6	OMC-2 F				11.5	158	0.550	0.190	73.000
	+05 35 27.13	-05 09 48.343	150 mas	4120 mas	208.818207	-19.242135		7	OMC-2 G				11.15	22	1.910	0.850	177.000
	+05 35 27.486	-05 09 51.333	5500 mas	1130 mas	208.819701	-19.241192		8	OMC-2 H				11.5	8	3.380	0.210	84.000
4	06 41 8.1	+09 29 40			203.311257	2.049659	G203.316+2.055		NGC 2264	Image	Descr	44 GHz (I);	7.45 .. 7.75	159 .. 901				NRAOVLA	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1996 February 3
	+06 41 8.046	+09 29 41.423	-410 mas	1410 mas	203.310857	2.049738		1	NGC 2264 A				7.75	159	0.890	0.150	84.000
	+06 41 8.073	+09 29 40.013	0 mas	0 mas	203.311257	2.049660		2	NGC 2264 B				7.45	901	0.520	0.190	79.000
5	18 04 53.9	-24 26 35.3			6.05138	-1.448517	G6.050-1.449		M8E	Image	Descr	44 GHz (I);	10.45 .. 10.95	66 .. 1462				NRAOVLA	+H₂O +CH₃OH I -CH₃OH II +OH	SFR		1995 July 13
	+18 04 53.866	-24 26 35.293	0 mas	0 mas	6.051381	-1.448516		1	M8E A				10.95	1462	0.470	0.080	178.000
	+18 04 53.88	-24 26 37.003	210 mas	-1710 mas	6.050992	-1.448795		2	M8E B				10.45	66	0.150	0.010	158.000
6	17 20 56.1	-35 45 21.3			351.444939	0.653499	G351.446+0.660		NGC 6364I(N)	Image	Descr	44 GHz (I);	-2.85 .. -7.4	13 .. 571				NRAOVLA	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1995 July 13
	+17 20 54.927	-35 45 15.71	-17560 mas	5570 mas	351.443953	0.657633		1	NGC 6364I(N) A				-7.05	20	0.380	0.020	-58.000
	+17 20 54.995	-35 45 16.17	-16550 mas	5110 mas	351.443978	0.657373		2	NGC 6364I(N) B				-7.4	41	0.250	0.090	-89.000
	+17 20 55.019	-35 45 16.17	-16180 mas	5110 mas	351.444026	0.657305		3	NGC 6364I(N) C				-7.4	91	0.410	0.210	-2.000
	+17 20 55.035	-35 45 16.05	-15940 mas	5230 mas	351.444084	0.657279		4	NGC 6364I(N) D				-7.2	161	0.290	0.060	69.000
	+17 20 55.249	-35 45 7.75	-12740 mas	13530 mas	351.446389	0.658001		5	NGC 6364I(N) E				-5.35	29	0.150	0.090	36.000
	+17 20 55.409	-35 45 7.08	-10340 mas	14200 mas	351.446851	0.657663		6	NGC 6364I(N) F				-5.25	31	0.440	0.200	3.000
	+17 20 55.439	-35 45 7.47	-9890 mas	13810 mas	351.446820	0.657518		7	NGC 6364I(N) G				-4.55	138	0.080	0.040	-73.000
	+17 20 55.493	-35 45 8.7	-9080 mas	12580 mas	351.446643	0.657173		8	NGC 6364I(N) H				-5.15	29	0.440	0.240	9.000
	+17 20 55.515	-35 45 8.32	-8740 mas	12960 mas	351.446774	0.657170		9	NGC 6364I(N) I				-5.45	13	0.390	0.190
	+17 20 55.829	-35 45 3.25	-4040 mas	18030 mas	351.448535	0.657103		10	NGC 6364I(N) J				-4.9	25	0.170	0.030	16.000
	+17 20 56.012	-35 44 54.07	-1290 mas	27210 mas	351.450983	0.658047		11	NGC 6364I(N) K				-2.85	76	0.770	0.290	41.000
	+17 20 56.02	-35 44 53.9	-1170 mas	27380 mas	351.451038	0.658052		12	NGC 6364I(N) L				-2.85	351	0.420	0.220	-5.000
	+17 20 56.047	-35 44 53.71	-760 mas	27570 mas	351.451134	0.658006		13	NGC 6364I(N) M				-2.85	20	0.470	0.210	166.000
	+17 20 56.098	-35 45 21.28	0 mas	0 mas	351.444939	0.653499		14	NGC 6364I(N) N				-4.65	571	0.050	0.020	-78.000
	+17 20 56.387	-35 45 17.01	4340 mas	4270 mas	351.446472	0.653372		15	NGC 6364I(N) O				-5.2	67	0.410	0.230	-178.000
	+17 20 56.524	-35 45 23.25	6390 mas	-1970 mas	351.445311	0.652004		16	NGC 6364I(N) P				-5.15	76	0.130	0.050	26.000
	+17 20 56.565	-35 45 24.32	7000 mas	-3040 mas	351.445145	0.651721		17	NGC 6364I(N) Q				-4.4	69	0.510	0.250	7.000
	+17 20 56.565	-35 45 24.42	7000 mas	-3140 mas	351.445122	0.651705		18	NGC 6364I(N) R				-3.7	77	0.210	0.130	35.000
	+17 20 56.576	-35 45 23.57	7170 mas	-2290 mas	351.445338	0.651809		19	NGC 6364I(N) S				-4.6	25	0.250	0.120	88.000
	+17 20 56.599	-35 45 24.28	7520 mas	-3000 mas	351.445221	0.651631		20	NGC 6364I(N) T				-3.85	31	0.240	0.130	-2.000
	+17 20 56.616	-35 45 24.21	7770 mas	-2930 mas	351.445269	0.651596		21	NGC 6364I(N) U				-3.55	29	0.110	0.100	64.000
	+17 20 56.623	-35 45 25.29	7880 mas	-4010 mas	351.445037	0.651405		22	NGC 6364I(N) V				-3.65	248	0.220	0.050	-49.000
	+17 20 56.626	-35 45 23.27	7920 mas	-1990 mas	351.445503	0.651717		23	NGC 6364I(N) W				-4.6	35	0.170	0.040	-87.000
7	18 29 24.8	-15 15 18.9			16.875712	-2.154275	G16.868-2.158		L379	Image	Descr	44 GHz (I);	17.5 .. 20.5	3 .. 350				NRAOVLA	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1995 July 13
	+18 29 24.793	-15 15 18.924	0 mas	-10 mas	16.875710	-2.154276		1	L379 A				17.5	350	0.050	0.050	-55.000
	+18 29 24.799	-15 15 17.314	90 mas	1600 mas	16.876118	-2.154091		2	L379 B				18.33	117	0.060	0.050	-30.000
	+18 29 24.803	-15 15 17.024	160 mas	1890 mas	16.876198	-2.154070		3	L379 C				18.58	38	0.290	0.190	46.000
	+18 29 26.121	-15 15 26.084	19930 mas	-7170 mas	16.876419	-2.159931		4	L379 D				20.5	13	0.320	0.060	76.000
	+18 29 26.167	-15 15 27.174	20620 mas	-8260 mas	16.876236	-2.160235		5	L379 E				20.42	6	0.090	0.060	50.000
	+18 29 26.917	-15 15 15.764	31870 mas	3150 mas	16.880444	-2.161442		6	L379 F				20.33	20	0.110	0.050	-70.000
	+18 29 27.269	-15 15 16.214	37140 mas	2700 mas	16.880987	-2.162752		7	L379 G				19.5	6	0.280	0.200	52.000
	+18 29 27.349	-15 15 13.714	38350 mas	5200 mas	16.881753	-2.162718		8	L379 H				19.33	4	0.280	0.180	49.000
	+18 29 27.868	-15 15 19.444	46130 mas	-530 mas	16.881306	-2.165303		9	L379 I				19.1	3	0.170	0.100	25.000
	+18 29 27.962	-15 15 18.964	47540 mas	-50 mas	16.881599	-2.165576		10	L379 J				19.35	29	0.320	0.060	-72.000
	+18 29 27.967	-15 15 18.994	47620 mas	-80 mas	16.881602	-2.165599		11	L379 K				19.35	19	0.290	0.170	43.000
8	18 14 11.2	-17 55 47.4			12.79939	-0.191765	G12.797-0.193		W33Met	Image	Descr	44 GHz (I);	32.45 .. 36.5	3 .. 155				NRAOVLA	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED		1995 July 13
	+18 14 11.181	-17 55 47.366	0 mas	0 mas	12.799390	-0.191765		1	W33Met A				32.65	155	0.050	0.020	-89.000
	+18 14 11.194	-17 55 47.546	200 mas	-180 mas	12.799371	-0.191836		2	W33Met B				32.45	7	0.090	0.050	-62.000
	+18 14 12.025	-17 55 17.386	12660 mas	29980 mas	12.808304	-0.190722		3	W33Met C				36.5	4	0.060	0.030	-18.000
	+18 14 12.041	-17 55 20.026	12910 mas	27340 mas	12.807691	-0.191130		4	W33Met D				36.5	45	0.280	0.200	40.000
	+18 14 12.079	-17 55 18.406	13470 mas	28960 mas	12.808157	-0.191045		5	W33Met E				36.4	3	0.300	0.190	43.000

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(met1_data_all.ra_hms) as ra_hms,MAX(met1_data_all.dec_dms) as dec_dms,MAX(met1_data_all.source_name) as source_name,MAX(met1_data_all.ra) as ra,MAX(met1_data_all.dec) as dec,MAX(met1_data_all.l) as l,MAX(met1_data_all.b) as b,MAX(met1_data_all.grp) as grp,MAX(met1_data_all.other_name) as other_name,MAX(met1_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met1_data_all.line) as line,MAX(met1_data_all.vrange) as vrange,MAX(met1_data_all.vpeak) as vpeak,MAX(met1_data_all.peak) as peak,MAX(met1_data_all.fwhm) as fwhm,MAX(met1_data_all.int) as int,MAX(met1_data_all.rms) as rms,MAX(met1_data_all.units) as units,MAX(met1_data_all.units_rms) as units_rms,MAX(met1_data_all.date_txt) as date_txt,MAX(met1_data_all.telescope_ref) as telescope_ref,MAX(met1_data_all.telescope_conf) as telescope_conf,MAX(met1_data_all.v_step) as v_step,MAX(met1_data_all.beam) as beam,MAX(met1_data_all.beam_maj) as beam_maj,MAX(met1_data_all.beam_min) as beam_min,MAX(met1_data_all.beam_pa) as beam_pa,MAX(met1_data_all.ref) as ref,MAX(met1_data_all.list_ref) as list_ref,MAX(met1_data_all.ascii) as ascii,MAX(met1_data_all.url) as url,MAX(met1_data_all.image) as image,MAX(met1_data_all.image2) as image2,MAX(met1_data_all.image3) as image3,MAX(met1_data_all.descr) as descr,MAX(met1_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met1_data_all.dist) as dist,1 as dist_parallax,MAX(met1_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 met1_data_all  LEFT JOIN all_objects_withmet ON met1_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 met1_data_all.line=transitions."Line"  WHERE ref ilike 'KOG98' AND detected=true AND hide=false GROUP BY ref

select met1_data_all.ra_hms,met1_data_all.dec_dms,met1_data_all.source_name,met1_data_all.ra,met1_data_all.dec,met1_data_all.l,met1_data_all.b,met1_data_all.grp,met1_data_all.other_name,met1_data_all.other_desc,met1_data_all.thermal,met1_data_all.line,met1_data_all.vrange,met1_data_all.vpeak,met1_data_all.peak,met1_data_all.fwhm,met1_data_all.int,met1_data_all.rms,met1_data_all.units,met1_data_all.units_rms,met1_data_all.date_txt,met1_data_all.telescope_ref,met1_data_all.telescope_conf,met1_data_all.v_step,met1_data_all.beam,met1_data_all.beam_maj,met1_data_all.beam_min,met1_data_all.beam_pa,met1_data_all.ref,met1_data_all.list_ref,met1_data_all.ascii,met1_data_all.url,met1_data_all.image,met1_data_all.image2,met1_data_all.image3,met1_data_all.descr,met1_data_all.id,met1_data_all.mjy_flag,met1_data_all.rms_mjy_flag,met1_data_all.dist,met1_data_all.dist_parallax,met1_data_all.date_txt,line_det,type,simbad_types_cat FROM met1_data_all   LEFT JOIN all_objects_withmet ON met1_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 met1_data_all.line=transitions."Line"  WHERE ref ilike 'KOG98' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

KOG98 - VLA Imaging of Class I Methanol Masers at 7 Millimeters with Angular Resolution approximately 0.2 Arcseconds

Interferometry data

View as list of objects

Detection table from Kogan & Slysh (1998)