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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
:
View
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 0.01M
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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:
Table (CSV)
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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
Group id
#
Maser spot
Source name
Image
Line
Thermal
V
peak
T
a
Major
Minor
PA
Telescope
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
CH
3
OH (class I)
line mark
(km/s)
(K)
(arcsec)
(arcsec)
(deg.)
(arcsec)
Yes
/
No
(kpc)
1
+20 39 0.137182
+42 22 46.4091
81.719537
0.572829
G81.718+0.571
DR 21(OH)
Image
2(0)->1(0)_A+;
*
-5.1 .. -0.2
8 .. 74
IRAM_inter
3.5
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
-SiO
SFR
June and September 1993
+20 39 0.177568
+42 22 45.8114
604.325 mas
-597.437 mas
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
3309.15 mas
-187.312 mas
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
15774.9 mas
2659.36 mas
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
23338.4 mas
-3512.41 mas
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
4850.38 mas
-5581.61 mas
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
29022.5 mas
-20791.4 mas
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
-16987.6 mas
-23663.5 mas
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
25816.7 mas
7997 mas
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
-18462 mas
-6068.85 mas
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
20002.8 mas
-21625.1 mas
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
G81.718+0.571
DR 21-W
2(0)->1(0)_A+;
*
-5.3 .. -1.1
6 .. 12
IRAM_inter
3.5
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
-SiO
SFR
June and September 1993
+20 38 54.8747
+42 19 23.7112
1042.28 mas
1602.44 mas
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
904.188 mas
-198.099 mas
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
9144.39 mas
4632.8 mas
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
-16474.6 mas
-10463.3 mas
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
-7668.35 mas
-430.188 mas
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
4460.16 mas
7715.31 mas
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
-7934.27 mas
-5531.24 mas
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
-20515.4 mas
-13478.4 mas
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
-8446.95 mas
-18533.3 mas
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
-5187.7 mas
-11221 mas
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
13749.2 mas
13150.1 mas
81.669115
0.551334
11
11
DR 21-W
-3.9
10 (4)
3.600
3.200
96.000
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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 'LIE97' 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 'LIE97' AND detected=true AND hide=false ORDER BY detected DESC,id
