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CH3OH_I
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
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 0.01M
sun
_. 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.
Input tables
: Table 2 and 3
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Detection table from Liechti & Walmsley (1997)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
#
Location
Source name
Image
Line
V
peak
T
a
Major
Minor
PA
Telescope
Beam
(J2000)
(J2000)
(arcsec)
(arcsec)
(deg.)
(deg.)
CH
3
OH (class I)
(km/s)
(K)
(arcsec)
(arcsec)
(deg.)
(arcsec)
1
+20 39 0.137182
+42 22 46.4091
81.719537
0.572829
DR 21(OH)
Image
2(0)->1(0)_A+
-5.1 .. -0.2
8 .. 74
IRAM_inter
3.5
+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
DR 21-W
2(0)->1(0)_A+
-5.3 .. -1.1
6 .. 12
IRAM_inter
3.5
+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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