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KRI13 - The first high-resolution observations of 19.9-GHz methanol masers

Short title: Krishnan et al. (2013)
Authors: Krishnan, V.Ellingsen, S. P.Voronkov, M. A.Breen, S. L.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 433, Issue 4, p.3346-3363
Bibcode:

Target type: Known_Class_II
Transitions: CH3OH_19(II)

Abstract
We have used the Australia Telescope Compact Array to undertake the first high-resolution observations of the 19.9-GHz (2₁-3₀E) methanol maser transition. The emission is coincident with the location of the targeted 6.7-GHz methanol masers to within 0.2 arcsec in absolute position. We find that the relative distribution of the 19.9-GHz maser emission in our sample differs from that observed in the 6.7-GHz transition, in contrast to the similar distribution often seen in the 6.7- and 12.2-GHz methanol masers in many sources. We also find that the peak velocity for the 19.9-GHz methanol masers is frequently different from that observed in other class II transitions in the same regions. These two results suggest that while 19.9-GHz methanol masers arise from the same general location as other class II transitions, they are likely not coincident on milliarcsecond scales, which has implications for multitransitional modelling of class II methanol maser sources. We have investigated the properties of the OH and other class II methanol transitions for those 107-GHz methanol masers with and without an associated 19.9-GHz methanol maser. On the basis of these comparisons, we suggest that the 19.9-GHz transition traces an evolutionary phase around the peak of the class II maser luminosity into its decline.

Abstract

We have used the Australia Telescope Compact Array to undertake the first high-resolution observations of the 19.9-GHz (2₁-3₀E) methanol maser transition. The emission is coincident with the location of the targeted 6.7-GHz methanol masers to within 0.2 arcsec in absolute position. We find that the relative distribution of the 19.9-GHz maser emission in our sample differs from that observed in the 6.7-GHz transition, in contrast to the similar distribution often seen in the 6.7- and 12.2-GHz methanol masers in many sources. We also find that the peak velocity for the 19.9-GHz methanol masers is frequently different from that observed in other class II transitions in the same regions. These two results suggest that while 19.9-GHz methanol masers arise from the same general location as other class II transitions, they are likely not coincident on milliarcsecond scales, which has implications for multitransitional modelling of class II methanol maser sources. We have investigated the properties of the OH and other class II methanol transitions for those 107-GHz methanol masers with and without an associated 19.9-GHz methanol maser. On the basis of these comparisons, we suggest that the 19.9-GHz transition traces an evolutionary phase around the peak of the class II maser luminosity into its decline.

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Detection table from Krishnan et al. (2013)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Line	V_range	V_peak	F_peak	Telescope	RMS	Beam	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(deg.)	(deg.)				CH₃OH (class II)	(km/s)	(km/s)	(Jy)		(Jy)	(arcsec)	Yes/No		(kpc)
1	13 50 41.8	-61 35 10.8	309.9205	0.4787	G309.921+0.479	G 309.921+0.479	Image	19 GHz (II);	-61.9;-60.4	-60.9	0.46	ATCA	0.008	0.6 x 0.4	-H₂O +CH₃OH II +OH	SFR
2	13 50 41.8	-61 35 10.7	309.9205	0.4788	G309.921+0.479	G 309.921+0.479	Image	6.6 GHz (II);	-64.1;-57.6	-59.7	681	ATCA	0.030	2.2 x 1.6	-H₂O +CH₃OH II +OH	SFR
3	15 31 45.4	-56 30 50.5	323.7399	-0.2626	G323.740-0.263	G 323.740-0.263	Image	19 GHz (II);	-52;-50	-50	0.04	ATCA	0.007	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED
4	15 31 45.4	-56 30 50.5	323.7400	-0.2627	G323.740-0.263	G 323.740-0.263	Image	6.6 GHz (II);	-55.1;-46.8	-51	2490	ATCA	0.040	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED
5	15 55 48.4	-52 43 6.8	328.8083	0.6330	G328.809+0.633	G 328.808+0.633	Image	19 GHz (II);	-44;-43.1	-43.6	0.63	ATCA	0.040	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
6	15 55 48.4	-52 43 6.7	328.8083	0.6330	G328.809+0.633	G 328.808+0.633	Image	6.6 GHz (II);	-46.8;-43.3	-44.4	148	ATCA	0.030	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
7	16 09 52.3	-51 54 57.2	330.9528	-0.1821	G330.954-0.182	G 330.953-0.182		6.6 GHz (II);	-88.9;-87.3	-87.7	5.7	ATCA	0.060	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
8	16 52 4.6	-46 08 34.1	339.8839	-1.2586	G339.884-1.259	G 339.884-1.259	Image	19 GHz (II);	-37.1;-35.5	-36.2	10.5	ATCA	0.009	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
9	16 52 4.7	-46 08 34.5	339.8840	-1.2589	G339.884-1.259	G 339.884-1.259	Image	6.6 GHz (II);	-40.3;-29.6	-38.7	1250	ATCA	0.040	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
10	17 05 11.2	-41 29 07	345.0034	-0.2244	G345.003-0.223	G 345.003-0.224	Image	19 GHz (II);	-27.3;-26.4	-26.5	0.26	ATCA	0.040	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
11	17 05 11.2	-41 29 6.9	345.0034	-0.2244	G345.003-0.223	G 345.003-0.224	Image	6.6 GHz (II);	-31.6;-22.2	-26.1	54.7	ATCA	0.200	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
12	16 56 47.5	-40 14 25.8	345.0094	1.7925	G345.010+1.792	G 345.010+1.792	Image	19 GHz (II);	-17.7;-17.3	-17.5	0.25	ATCA	0.007	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
13	16 56 47.6	-40 14 25.8	345.0095	1.7925	G345.010+1.792	G 345.010+1.792	Image	6.6 GHz (II);	-22.9;-16.6	-22.4	218	ATCA	0.040	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
14	17 30 26.2	-34 41 45.6	353.4098	-0.3601	G353.410-0.360	G 353.410-0.360	Image	19 GHz (II);	-21.1;-19.3	-20.5	0.55	ATCA	0.006	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
15	17 30 26.2	-34 41 45.7	353.4098	-0.3601	G353.410-0.360	G 353.410-0.360	Image	6.6 GHz (II);	-22.4;-19.1	-20.3	89.6	ATCA	0.050	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR
16	17 20 53.4	-35 47 1.5	351.4168	0.6452	G351.417+0.645	NGC 6334F	Image	19 GHz (II);	-11.4;-8.7	-10.5	144	ATCA	0.020	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED
17	17 20 53.3	-35 47 1.8	351.4167	0.6452	G351.417+0.645	NGC 6334F	Image	23 GHz (II);	-11.2;-10.2	-10.5	50	ATCA	0.030	0.6 x 0.4	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED
18	17 20 53.4	-35 47 1.6	351.4168	0.6452	G351.417+0.645	NGC 6334F	Image	6.6 GHz (II);	-11.4;-6.5	-10.3	2230	ATCA	1.000	2.2 x 1.6	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	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 'KRI13' 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 'KRI13' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

KRI13 - The first high-resolution observations of 19.9-GHz methanol masers

View as list of objects

Detection table from Krishnan et al. (2013)