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H
2
O
,
CH3OH_II
COD00 - On the occurrence of the 6.7 GHz CH
3
OH maser emission in UCH bt II regions
Short title
: Codella & Moscadelli (2000)
Authors
: Codella, C.Moscadelli, L.
Journal
: Astronomy and Astrophysics, v.362, p.723-729 (2000)
Bibcode
:
2000A&A...362..723C
Target type
: UCHII
Transitions
: CH3OH_6(II)
Abstract
We present the results of a statistical survey of the 6.7 GHz CH
3
OH and 22.2 GHz H
2
O emissions towards a large homogeneous sample of ultracompact (UC) H II regions, performed to investigate the nature of the methanol emission: does it point out ionized regions or does it trace earlier stages of the star forming process? The present detection rates are almost identical: 23% for CH
3
OH and 22% for H_2O. Even considered the uncertainties of the survey, the large number of non-detections is consistent with the scenario where methanol masers disappear during the UC phase, like water masers do. Moreover, the probability to have the CH
3
OH counterpart of a H
2
O source is at least 40%, indicating that these maser emissions are emphasizing two at least partly overlapping evolutionary phases. The comparison between the velocity ranges suggests that methanol and water masers form in different gas components related to the star forming process.
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Detection table from Codella & Moscadelli (2000)
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individual components
ID
Obs. RA
Obs. Dec
l
b
Group id
Source name
Image
Line
V
range
V
peak
FWHM
F
peak
∫F dv
Telescope
RMS
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(deg.)
(deg.)
CH
3
OH (class II)
(km/s)
(km/s)
(km/s)
(Jy)
(Jy*km/s)
(Jy)
(arcsec)
Yes
/
No
(kpc)
1
17 47 20.3
-28 23 0.8
0.6680
-0.0350
G0.6667-0.0344
0.668-0.035
Image
6.6 GHz (II)
;
47.6;73.2
+49.81 (0.04)
1.54 (0.14)
30.8 (4.3)
100.8 (9.4)
MED
3.100
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
1997
2
18 06 14.4
-20 31 22.1
9.6230
0.1980
G9.621+0.195
9.623+0.198
Image
6.6 GHz (II)
;
-1.5;6.2
+1.69 (0.01)
0.32 (0.01)
3400.0 (140.0)
1377.2 (6.5)
MED
2.900
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
3
18 08 35.4
-19 52 10.7
10.4620
0.0340
G10.472+0.027
10.462+0.034
Image
6.6 GHz (II)
;
59.0;77.6
+72.49 (0.04)
0.86 (0.09)
19.3 (2.3)
85.4 (5.5)
MED
1.400
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
4
18 09 39.5
-19 26 26.3
10.9590
0.0220
G10.958+0.022
10.959+0.022
Image
6.6 GHz (II)
;
23.4;25.6
+24.64 (0.06)
1.00 (0.13)
11.5 (1.0)
18.3 (4.4)
MED
1.500
336
+H
2
O
-CH
3
OH I
+CH
3
OH II
SFR
1997
5
18 14 1.1
-18 53 24.2
11.9370
-0.6160
G11.937-0.616
11.937-0.616
Image
6.6 GHz (II)
;
31.4;41.7
+32.37 (0.02)
0.86 (0.05)
26.3 (0.6)
38.4 (5.1)
MED
1.400
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
SFR
1997
6
18 24 36.4
-12 51 6.4
18.4610
-0.0040
G18.461-0.004
18.461-0.004
Image
6.6 GHz (II)
;
49.0;49.9
+49.43 (0.01)
0.44 (0.32)
12.0(1.2)
11.6(1.8)
MED
1.200
336
+H
2
O
-CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
7
18 26 4.4
-11 52 34
19.4910
0.1350
G19.485+0.151
19.491+0.135
Image
6.6 GHz (II)
;
21.6;22.3
+21.32 (0.05)
1.05 (0.15)
11.0(0.7)
21.5 (2.5)
MED
1.200
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
8
18 34 45
-08 32 14.1
23.4390
-0.2100
G23.425-0.219
23.439-0.210
Image
6.6 GHz (II)
;
93.8;107.5
+103.07 (0.04)
2.06 (0.09)
20.6(2.1)
60.4 (3.6)
MED
1.200
336
+H
2
O
-CH
3
OH I
+CH
3
OH II
1997
9
18 39 55.7
-05 38 46.1
26.5970
-0.0230
G26.597-0.024
26.597-0.023
Image
6.6 GHz (II)
;
24.5;24.9
+24.70 (0.04)
0.47 (0.10)
9.3 (1.2)
9.25 (2.7)
MED
2.200
336
+H
2
O
-CH
3
OH I
+CH
3
OH II
SFR
1997
10
18 47 33.7
-01 55 25.4
30.7780
-0.0150
G30.758-0.050
30.778-0.015
Image
6.6 GHz (II)
;
90.8;92.2
+91.50 (0.04)
1.13 (0.09)
17.2 (2.6)
30.1 (3.5)
MED
2.500
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
11
18 47 15.8
-01 47 11.6
30.8660
0.1140
G30.860+0.124
30.866+0.114
Image
6.6 GHz (II)
;
100.2;103.6
+101.81 (0.03)
0.51 (0.09)
13.6(2.0)
19.1 (2.9)
MED
2.400
336
+H
2
O
-CH
3
OH I
+CH
3
OH II
1997
12
18 47 34.4
-01 12 42.3
31.4130
0.3070
G31.412+0.307
31.413+0.307
Image
6.6 GHz (II)
;
94.3;105.1
+103.74 (0.07)
0.82 (0.13)
7.3 (0.4)
15.2 (3.0)
MED
1.000
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
13
18 52 7.6
+00 08 51.9
33.1420
-0.0860
G33.133-0.092
33.142-0.086
Image
6.6 GHz (II)
;
72.5;74.7
+73.68 (0.17)
1.55 (0.17)
7.4 (0.6)
12.2(1.6)
MED
1.000
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
14
18 53 18.2
+01 14 59.9
34.2570
0.1550
G34.257+0.153
34.257+0.155
Image
6.6 GHz (II)
;
55.3;58.3
+57.62 (0.02)
0.56 (0.07)
16.8(0.6)
12.7(1.4)
MED
0.800
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
MIXED
1997
15
19 02 39.7
+06 59 3.8
40.4240
0.6990
G40.425+0.700
40.424+0.699
Image
6.6 GHz (II)
;
15.3;16.4
+15.70 (0.04)
0.59 (0.11)
10.4(1.1)
10.9(1.7)
MED
2.500
336
+H
2
O
+CH
3
OH II
+OH
SFR
1997
16
19 14 26
+09 22 37.5
43.8900
-0.7830
G43.890-0.784
43.890-0.783
Image
6.6 GHz (II)
;
47.0;52.6
+47.53 (0.02)
0.38 (0.06)
17.5 (1.8)
11.8(3.0)
MED
2.600
336
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
17
19 13 28.9
+10 53 55.6
45.1290
0.1310
G45.122+0.132
45.129+0.131
Image
6.6 GHz (II)
;
57.2;58.5
+58.81 (0.02)
0.74 (0.13)
9.9 (1.0)
7.2 (1.7)
MED
1.600
336
+H
2
O
-CH
3
OH I
+CH
3
OH II
+OH
SFR
1997
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WISE colored
SDSS color
IRAC color I1,I2,I4
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NVSS (1.4GHz)
ATLASGAL 870 um
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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 'COD00' 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 'COD00' AND detected=true AND hide=false ORDER BY detected DESC,id