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COD00 - On the occurrence of the 6.7 GHz CH₃OH 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:

Target type: UCHII
Transitions: CH3OH_6(II)

Abstract
We present the results of a statistical survey of the 6.7 GHz CH₃OH and 22.2 GHz H₂O 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 CH₃OH 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 CH₃OH counterpart of a H₂O 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.

Abstract

We present the results of a statistical survey of the 6.7 GHz CH₃OH and 22.2 GHz H₂O 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 CH₃OH 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 CH₃OH counterpart of a H₂O 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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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.)				CH₃OH (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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O -CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O -CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O -CH₃OH I +CH₃OH 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	+H₂O -CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O -CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O +CH₃OH 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	+H₂O +CH₃OH I +CH₃OH 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	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1997

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 Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

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

Display data from paper

COD00 - On the occurrence of the 6.7 GHz CH3OH maser emission in UCH bt II regions

View as list of objects

Detection table from Codella & Moscadelli (2000)

COD00 - On the occurrence of the 6.7 GHz CH₃OH maser emission in UCH bt II regions