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LIE97 - Thermal methanol emission in the DR21 complex. Interferometric maps: a comparison with maser emission.

  Interferometry data

Short title: Liechti & Walmsley (1997)
Authors: Liechti, S. Walmsley, C. M.
Journal: Astronomy and Astrophysics, v.321, p.625-633
Bibcode: 1997A&A...321..625L

PDF: LIE97.pdf

• Target type: High_mass_SFR
  Transitions: CH3OH_44(I),CH3OH_95(I),CH3OH_6(II),CH3OH_12(II),CH3OH_108(II),CH3OH_157(II)
  

• Abstract

  We present interferometric observations with ~3.5'' resolution of the 2_k_->1_k_ methanol lines towards the methanol masers in the DR21/DR21(OH) complex. These transitions are not masing and hence our measurements can be used to place limits on the methanol mass associated with the maser spots. We do not find in general good correlation between the peaks of 'non-maser' methanol emission and the positions of Class I methanol masers. In particular, we put an upper limit on 2_k_->1_k_ emission towards the 8_0_->7_1_A^+^ maser DR21(OH)-1 from Plambeck and Menten (1990) (hereafter PM90). We do find however evidence for coincidence between the peak of the 2_1_->1_1_E emission in our map with the Class I masers towards DR21-W. We conclude that methanol Class I masers are likely to originate in a region considerably smaller than our synthesised beam (3.5'') and with methanol column density of order 10^16^cm^-2^. It seems reasonable that they might form in regions of diameter 1000AU and mass 0.01Msun_. Our data also show differences between the distribution of methanol and that of other species which suggest large spatial variations in the methanol abundance. In particular, we see evidence for high methanol column density towards the submillimeter continuum source DR21(OH)-MM1. In the western lobe of the DR21 outflow, the thermal methanol emission appears to be 'sandwiched' between vibrationally excited H_2_ emission, tracing the outflow shock front, and CS emission tracing the dense ambient medium. This is consistent with the idea that methanol can be enhanced in shock regions, where the outflow impinges on the surrounding dense molecular clumps, releasing methanol from dust grain ice mantles.

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Location	Source name	Image	Line	Thermal	Vpeak	Ta	Major	Minor	PA	Telescope	Beam	Detection	Date
	(J2000)	(J2000)	(arcsec)	(arcsec)	(deg.)	(deg.)						CH3OH (class I)	line mark	(km/s)	(K)	(arcsec)	(arcsec)	(deg.)		(arcsec)	Yes/No
1	+20 39 0.137182	+42 22 46.4091			81.719537	0.572829	G81.722+0.572			DR 21(OH)	Image	2(0)->1(0)_A+	*	-5.1 .. -0.2	8 .. 74				IRAM_inter	3.5	+CH3OH I +CH3OH II +OH -SiO	June and September 1993
	+20 39 0.177568	+42 22 45.8114	0.604325	-0.597437	81.719480	0.572630		1	1 (DR 21(OH)-2)	DR 21(OH)				-1.1	14 (5)	8.100	6.500	110.000
	+20 39 0.35789	+42 22 46.2215	3.30915	-0.187312	81.719908	0.572259		2	2 (MM2)	DR 21(OH)				-0.2	18 (5)	9.600	7.800	45.000
	+20 39 1.18894	+42 22 49.0682	15.7749	2.65936	81.722092	0.570709		3	3 (MM1)	DR 21(OH)				-3.4	74 (52)	5.400	4.300	58.000
	+20 39 1.69317	+42 22 42.8964	23.3384	-3.51241	81.721675	0.568434		4	4 (DR 21(OH)-4)	DR 21(OH)				-5.1	11 (1)	7.300	4.400	46.000
	+20 39 0.460639	+42 22 40.8272	4.85038	-5.58161	81.718911	0.571096		5	5	DR 21(OH)				-0.8	13 (1)	9.300	5.300	84.000
	+20 39 2.07212	+42 22 25.6174	29.0225	-20.7914	81.718575	0.564589		6	6	DR 21(OH)				-2.4	8 (2)	5.100	3.200	135.000
	+20 38 59.0048	+42 22 22.7453	-16.9876	-23.6635	81.712198	0.571599		7	7 (DR 21(OH)W-A)	DR 21(OH)				-1.9	11 (4)	10.600	5.000	45.000
	+20 39 1.85839	+42 22 54.4058	25.8167	7.997	81.724522	0.569975		8	8	DR 21(OH)				-3.9	9 (3)	6.300	4.400	53.000
	+20 38 58.9065	+42 22 40.34	-18.462	-6.06885	81.715894	0.574811		9	9	DR 21(OH)				-4.5	11 (2)	7.300	5.600	78.000
	+20 39 1.4708	+42 22 24.7837	20.0028	-21.6251	81.717265	0.565917		10	10	DR 21(OH)				-3.7	9 (5)	3.700	3.400	46.000
2	+20 38 54.8052	+42 19 22.1073			81.664497	0.551354	G81.665+0.551			DR 21-W		2(0)->1(0)_A+	*	-5.3 .. -1.1	6 .. 12				IRAM_inter	3.5	-H2O +CH3OH I +CH3OH II	June and September 1993
	+20 38 54.8747	+42 19 23.7112	1.04228	1.60244	81.664981	0.551455		1	1	DR 21-W				-1.9	9 (2)	7.100	5.100	45.000
	+20 38 54.8655	+42 19 21.9107	0.904188	-0.198099	81.664567	0.551174		2	2	DR 21-W				-1.1	12 (3)	5.100	3.400	45.000
	+20 38 55.4148	+42 19 26.7416	9.14439	4.6328	81.666661	0.550646		3	3	DR 21-W				-5.3	8 (3)	8.300	4.000	79.000
	+20 38 53.7069	+42 19 11.6455	-16.4746	-10.4633	81.660133	0.552274		4	4	DR 21-W				-2.1	10 (2)	11.100	6.200	45.000
	+20 38 54.294	+42 19 21.6786	-7.66835	-0.430188	81.663445	0.552532		5	5	DR 21-W				-2.7	7 (2)	5.800	4.500	66.000
	+20 38 55.1025	+42 19 29.8241	4.46016	7.71531	81.666756	0.551930		6	6	DR 21-W				-5	7 (2)	7.300	3.600	152.000
	+20 38 54.2762	+42 19 16.5776	-7.93427	-5.53124	81.662287	0.551714		7	7	DR 21-W				-3.3	6 (3)	14.200	6.100	177.000
	+20 38 53.4375	+42 19 8.63037	-20.5154	-13.4784	81.658963	0.552424		8	8	DR 21-W				-1.5	6 (3)	3.800	3.500	55.000
	+20 38 54.2421	+42 19 3.57548	-8.44695	-18.5333	81.659355	0.549602		9	9	DR 21-W				-5	8 (2)	3.700	2.600	123.000
	+20 38 54.4594	+42 19 10.8878	-5.1877	-11.221	81.661375	0.550305		10	10	DR 21-W				-4.5	9 (2)	5.600	4.100	135.000
	+20 38 55.7218	+42 19 35.2589	13.7492	13.1501	81.669115	0.551334		11	11	DR 21-W				-3.9	10 (4)	3.600	3.200	96.000

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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 2MASS K