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H
2
O
MAN92 - Synthesis Imaging of the DR 21 (OH) Cluster. II. Thermal Ammonia and Water Maser Emission
Interferometry data
Short title
: Mangum et al. (1992)
Authors
: Mangum, Jeffrey G.Wootten, AlwynMundy, Lee G.
Journal
: Astrophysical Journal v.388, p.467
Bibcode
:
1992ApJ...388..467M
Target type
: HII
Transitions
: H2O_22
Abstract
Results of high-sensitivity, 4-arcsec-resolution imaging of the thermal ammonia and water maser emission of the DR 21 (OH) molecular cloud are presented. Images of the NH3(1, 1) and 2, 2) transitions show four primary emission regions embedded in a generally clumpy emission distribution. A total of 18 ammonia cores are identified in these images. An analysis of the physical properties of these cores shows that they are massive (15-1000 solar masses) and warm (about 20 to greater than 80 K) with a range of sizes (0.06-0.28 pc). One of these cores is a hot (greater than 80 K), compact (about 0.07 pc) region associated with shell-type H2O maser emission. The 3D distribution of these cores suggests a strong interaction between young massive stars and their maternal environs. Two source concepts are formulated to explain this distribution.
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Detection table from Mangum et al. (1992)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
#
Source name
Image
Descr.
Line
V
range
V
peak
F
peak
Telescope
Configuration
V
step
RMS
Beam
PA
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(km/s)
(Jy)
(km/s)
(mJy/beam)
(arcsec)
(deg.)
Yes
/
No
(kpc)
1
+20 39 0.770843
+42 22 46.6877
81.720784
0.571328
G81.713+0.567
DR 21 Group 1
Image
Descr
22 GHz
;
-23.7;17.7
-5.63 .. -1.03
25.84 .. 49.24
NRAOVLA
A
0.33
10.000
0.079 x 0.076
-51
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1988 Dec 19
+20 39 0.771167
+42 22 46.6781
4.3 mas
-7.9 mas
81.720783
0.571326
1
DR 21 Group 1
-1.03
25.84
+20 39 0.771653
+42 22 46.6681
11.6 mas
-17.9 mas
81.720781
0.571323
2
DR 21 Group 1
-4.64
49.24
+20 39 0.770467
+42 22 46.6931
-6.2 mas
7.1 mas
81.720785
0.571330
3
DR 21 Group 1
-5.63
34.5
2
+20 39 0.31908
+42 22 39.8612
81.718433
0.571279
G81.713+0.567
DR 21 Group 2
22 GHz
;
-23.7;17.7
5.88 .. 15.85
0.13 .. 4.71
NRAOVLA
A
0.33
10.000
0.079 x 0.076
-51
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1988 Dec 19
+20 39 0.318993
+42 22 39.8585
0.5 mas
-1.9 mas
81.718432
0.571279
1
DR 21 Group 2
5.88
4.71
+20 39 0.316253
+42 22 39.8492
-40.6 mas
-11.2 mas
81.718425
0.571284
2
DR 21 Group 2
6.87
0.75
+20 39 0.315527
+42 22 39.8399
-51.5 mas
-20.5 mas
81.718422
0.571284
3
DR 21 Group 2
10.16
1.66
+20 39 0.31522
+42 22 39.8454
-56.1 mas
-15 mas
81.718422
0.571286
4
DR 21 Group 2
13.12
2.43
+20 39 0.31706
+42 22 39.8186
-28.5 mas
-41.8 mas
81.718420
0.571277
5
DR 21 Group 2
15.85
0.13
3
+20 39 0.274172
+42 22 38.2837
81.718001
0.571122
G81.713+0.567
DR 21 Group 3
22 GHz
;
-23.7;17.7
-14.84 .. -5.3
6.22 .. 71.31
NRAOVLA
A
0.33
10.000
0.079 x 0.076
-51
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1988 Dec 19
+20 39 0.27384
+42 22 38.2889
-3.6 mas
5.3 mas
81.718002
0.571124
1
DR 21 Group 3
-14.84
8.51
+20 39 0.273413
+42 22 38.2957
-10 mas
12.1 mas
81.718003
0.571126
2
DR 21 Group 3
-13.86
6.22
+20 39 0.273247
+42 22 38.2984
-12.5 mas
14.8 mas
81.718003
0.571127
3
DR 21 Group 3
-10.57
18
+20 39 0.27348
+42 22 38.2933
-9 mas
9.7 mas
81.718002
0.571125
4
DR 21 Group 3
-7.93
66.62
+20 39 0.27396
+42 22 38.2844
-1.8 mas
0.8 mas
81.718001
0.571123
5
DR 21 Group 3
-5.3
71.31
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select MAX(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_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 h2o_data_all LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line" WHERE ref ilike 'MAN92' AND detected=true AND hide=false GROUP BY ref
select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all LEFT JOIN all_objects_withmet ON h2o_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 h2o_data_all.line=transitions."Line" WHERE ref ilike 'MAN92' AND detected=true AND hide=false ORDER BY detected DESC,id
