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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
V
range
V
peak
FWHM
F
peak
∫F dv
Telescope
RMS
Beam
Detection
Date
(J2000)
(J2000)
(deg.)
(deg.)
(km/s)
(km/s)
(km/s)
(Jy)
(Jy*km/s)
(Jy)
(arcsec)
Yes
/
No
1
18 33 23.8
-08 33 33.7
23.2650
0.0770
G23.265+0.078
23.265+0.077
Image
76.2;82.4
+0.077
0.65 (0.05)
10.6 (1.2)
16.8 (2.0)
MED
1.400
114
+H
2
O
+CH
3
OH I
-CH
3
OH II
+OH
1993-1994
2
19 10 33.4
+09 08 24.8
43.2370
-0.0450
G43.237-0.046
43.237-0.045
Image
-119.9;23.0
-0.045
0.75 (0.33)
132.0 (4.7)
711.7 (12.9)
MED
1.300
114
+H
2
O
+CH
3
OH I
-CH
3
OH II
1993-1994
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X
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
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.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.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.image) as image,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,MAX(h2o_data_all.date_txt) as date_txt,MAX(line_det) as line_det FROM h2o_data_all LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name WHERE ref ilike 'COD00' 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.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.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.image,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.date_txt,line_det FROM h2o_data_all LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name WHERE ref ilike 'COD00' AND detected=true AND hide=false ORDER BY detected DESC,id