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ELL96B - A survey of the Galactic plane for 6.7-GHz methanol masers - I. l=325-335 b=-0.53-0.53

Short title: Ellingsen et al. (1996)
Authors: Ellingsen, S. P.von Bibra, M. L.McCulloch, P. M.Norris, R. P.Deshpande, A. A.Phillips, C. J.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 2, pp. 378-396.
Bibcode:

Target type: Blind
Transitions: CH3OH_6(II)

Abstract
We report the results of the first complete survey of an area of the Galactic plane for maser emission from the 6.7-GHz 5_1-->6_0 A^+ transition of CH_3OH. The survey covers a 10.6-deg^2 region of the Galactic plane in the longitude range 325 deg-335 deg and latitude range -0.Ë訙-0.Ë訙. The survey is sensitive to masers with a peak flux density greater than ~2.6 Jy. The weakest maser detected has a peak flux density of 2.3 Jy, and the strongest a peak flux density of 425 Jy. We detected a total of 50 distinct masers, 26 of which are new detections. We show that many 6.7-GHz CH_3OH masers are not associated with IRAS sources, and that some are associated with sources that have colours differing from those of a typical ultracompact HII (UCHII) region. We estimate that the number of UCHII regions in the Galaxy is significantly more than suggested by IRAS-based estimates, possibly by more than a factor of 2.

Abstract

We report the results of the first complete survey of an area of the Galactic plane for maser emission from the 6.7-GHz 5_1-->6_0 A^+ transition of CH_3OH. The survey covers a 10.6-deg^2 region of the Galactic plane in the longitude range 325 deg-335 deg and latitude range -0.Ë訙-0.Ë訙. The survey is sensitive to masers with a peak flux density greater than ~2.6 Jy. The weakest maser detected has a peak flux density of 2.3 Jy, and the strongest a peak flux density of 425 Jy. We detected a total of 50 distinct masers, 26 of which are new detections. We show that many 6.7-GHz CH_3OH masers are not associated with IRAS sources, and that some are associated with sources that have colours differing from those of a typical ultracompact HII (UCHII) region. We estimate that the number of UCHII regions in the Galaxy is significantly more than suggested by IRAS-based estimates, possibly by more than a factor of 2.

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Detection table from Ellingsen et al. (1996)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Descr.	Line	V_peak	F_peak	∫F dv	Telescope	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)					CH₃OH (class II)	(km/s)	(Jy)	(Jy*km/s)		(arcsec)	Yes/No		(kpc)
1	15 43 40.7	-54 19 28	326.3976	0.5052	G326.398+0.505	326.40+0.51	Image	Descr	6.6 GHz (II);	-38.1	2.4	1.4	Hobart_26m	420	+CH₃OH II	UNK		1993 April - 1994 September
2	15 44 33.3	-54 06 23	326.6321	0.6001	G326.641+0.611	326.63+0.60	Image	Descr	6.6 GHz (II);	-43.1	18	-36	Hobart_26m	420	+CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
3	15 44 52.1	-54 10 30	326.6265	0.5178	G326.627+0.518	326.63+0.52	Image	Descr	6.6 GHz (II);	-41	5.6	-38	Hobart_26m	420	+CH₃OH II	SFR		1993 April - 1994 September
4	15 51 11.1	-54 59 01	326.8435	-0.6840	G326.843-0.684	326.84-0.68	Image		6.6 GHz (II);	-57.6	10	-57	Hobart_26m	420	+CH₃OH II	UNK		1993 April - 1994 September
5	15 47 33.6	-53 52 35	327.1219	0.5102	G327.120+0.511	327.12+0.51	Image	Descr	6.6 GHz (II);	-87.1	80	-83	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
6	15 49 14	-53 45 36	327.3878	0.4481	G327.402+0.444	327.40+0.44	Image	Descr	6.6 GHz (II);	-82.6	106	-75	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
7	15 50 21.4	-53 56 25	327.4045	0.2039	G327.392+0.199	327.40+0.20	Image	Descr	6.6 GHz (II);	-84.6	9	-82	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
8	15 52 34	-54 03 12	327.5857	-0.0884	G327.590-0.094	327.59-0.09	Image	Descr	6.6 GHz (II);	-86.2	3.2	1.7	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
9	15 52 47.3	-54 03 15	327.6104	-0.1096	G327.618-0.111	327.61-0.11	Image	Descr	6.6 GHz (II);	-97.5	2.3	1.8	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	EVOLVED		1993 April - 1994 September
10	15 54 34.8	-53 52 18	327.9298	-0.1362	G327.945-0.115	327.93-0.14	Image	Descr	6.6 GHz (II);	-51.7	6.6	-51	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
11	15 57 58.5	-53 59 23	328.2369	-0.5477	G328.237-0.547	328.24-0.55	Image	Descr	6.6 GHz (II);	-44.9	421	-34	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
12	15 57 59.9	-53 58 01	328.2542	-0.5325	G328.237-0.547	328.25-0.53	Image	Descr	6.6 GHz (II);	-37.4	425	-36	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
13	15 55 51.2	-52 42 36	328.8191	0.6351	G328.809+0.633	328.81+0.63	Image	Descr	6.6 GHz (II);	-44.5	278	-43	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
14	16 00 22.1	-53 12 57	329.0098	-0.1906	G329.031-0.200	329.03-0.20	Image	Descr	6.6 GHz (II);	-41.9	25	-41	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
15	16 00 36	-53 12 17	329.0433	-0.2048	G329.031-0.200	329.03-0.21	Image	Descr	6.6 GHz (II);	-37.5	275	-34	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
16	16 01 12.7	-53 15 58	329.0723	-0.3112	G329.066-0.308	329.07-0.31	Image	Descr	6.6 GHz (II);	-43.9	24	-43	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
17	16 01 36.3	-53 11 49	329.1621	-0.2976	G329.163-0.286	329.18-0.31	Image	Descr	6.6 GHz (II);	-55.7	13	-51	Hobart_26m	420	+CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
18	16 00 29.3	-52 44 39	329.3317	0.1546	G329.339+0.148	329.33+0.15	Image	Descr	6.6 GHz (II);	-106.5	14	-10	Hobart_26m	420	-H₂O -CH₃OH I +CH₃OH II +OH	MIXED		1993 April - 1994 September
19	16 03 36.5	-53 08 58	329.4192	-0.4598	G329.405-0.459	329.41-0.46	Image	Descr	6.6 GHz (II);	-66.8	144	-66	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
20	15 59 39.9	-52 22 45	329.4751	0.5129	G329.469+0.503	329.48+0.51	Image	Descr	6.6 GHz (II);	-72.1	13	-65	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
21	16 02 7.3	-52 35 13	329.6218	0.1109	G329.610+0.114	329.62+0.11	Image		6.6 GHz (II);	-60.1	30	-59	Hobart_26m	420	-H₂O -CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
22	16 09 53.3	-51 55 38	330.9469	-0.1921	G330.954-0.182	330.95-0.18	Image	Descr	6.6 GHz (II);	-87.6	7	-87	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
23	16 11 0.7	-51 51 18	331.1231	-0.2568	G331.132-0.244	331.13-0.24	Image	Descr	6.6 GHz (II);	-84.4	34	-84	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
24	16 11 22.3	-51 42 26	331.2646	-0.1866	G331.278-0.188	331.28-0.19	Image	Descr	6.6 GHz (II);	-78.1	165	-78	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
25	16 12 23.3	-51 46 11	331.3369	-0.3397	G331.342-0.346	331.34-0.35	Image	Descr	6.6 GHz (II);	-67.4	66	-64	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	MIXED		1993 April - 1994 September
26	16 10 10.3	-51 16 18	331.4238	0.2598	G331.425+0.264	331.42+0.26	Image	Descr	6.6 GHz (II);	-88.6	25	-88	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II	EVOLVED		1993 April - 1994 September
27	16 12 14.6	-51 34 39	331.4519	-0.1841	G331.442-0.187	331.45-0.18	Image	Descr	6.6 GHz (II);	-88.5	70	-84	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
28	16 12 10.9	-51 25 24	331.5503	-0.0650	G331.543-0.066	331.54-0.07	Image	Descr	6.6 GHz (II);	-84.1	12	-83	Hobart_26m	420	-H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
29	16 12 28.7	-51 27 04	331.5651	-0.1169	G331.556-0.121	331.56-0.12	Image	Descr	6.6 GHz (II);	-103.4	35	-94	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
30	16 16 19.3	-51 17 50	332.1058	-0.4187	G332.094-0.421	332.11-0.42	Image	Descr	6.6 GHz (II);	-61.4	16	-58	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
31	16 15 50.5	-50 55 26	332.3103	-0.0974	G332.295-0.094	332.31-0.10		Descr	6.6 GHz (II);	-47	6.3	-42	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	GALAXY		1993 April - 1994 September
32	16 17 29.3	-51 09 24	332.3348	-0.4447	G332.335-0.445	332.33-0.44		Descr	6.6 GHz (II);	-53.8	4	4.5	Hobart_26m	420	+CH₃OH II	SFR		1993 April - 1994 September
33	16 17 19.2	-50 46 33	332.5810	-0.1529	G332.581-0.153	332.58-0.15		Descr	6.6 GHz (II);	-51	5	-49	Hobart_26m	420	+CH₃OH II	UNK		1993 April - 1994 September
34	16 21 19.9	-50 53 40	332.9495	-0.6816	G332.963-0.680	332.95-0.68		Descr	6.6 GHz (II);	-52.9	21	-52	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
35	16 21 23.2	-50 53 02	332.9631	-0.6802	G332.963-0.680	332.96-0.68		Descr	6.6 GHz (II);	-45.9	41	-38	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
36	16 18 47.3	-50 21 56	333.0343	-0.0219	G333.029-0.015	333.03-0.02		Descr	6.6 GHz (II);	-53.6	3	-53	Hobart_26m	420	+CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
37	16 20 53.7	-50 37 32	333.0902	-0.4423	G333.090-0.442	333.07-0.45	Image	Descr	6.6 GHz (II);	-54.5	12	-53	Hobart_26m	420	+CH₃OH II			1993 April - 1994 September
38	16 20 59.5	-50 35 47	333.1217	-0.4324	G333.127-0.434	333.12-0.43	Image	Descr	6.6 GHz (II);	-49.3	11	-48	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
39	16 21 2.7	-50 35 54	333.1263	-0.4397	G333.127-0.434	333.13-0.44	Image	Descr	6.6 GHz (II);	-44.4	3	-42	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
40	16 21 39.1	-50 40 06	333.1450	-0.5572	G333.130-0.560	333.15-0.56	Image	Descr	6.6 GHz (II);	-56.8	17	-52	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
41	16 19 41.7	-50 19 53	333.1614	-0.0989	G333.163-0.101	333.16-0.10	Image	Descr	6.6 GHz (II);	-95.3	8	-91	Hobart_26m	420	+CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
42	16 19 46.3	-50 17 20	333.2000	-0.0772	G333.184-0.091	333.20-0.08	Image	Descr	6.6 GHz (II);	-82	6.5	-81	Hobart_26m	420	+CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
43	16 19 51	-50 15 18	333.2327	-0.0619	G333.234-0.061	333.23-0.06	Image	Descr	6.6 GHz (II);	-81.9	4.7	-81	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	MIXED		1993 April - 1994 September
44	16 19 31.7	-50 04 03	333.3276	0.1078	G333.315+0.105	333.33+0.11	Image	Descr	6.6 GHz (II);	-43.7	9	-41	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
45	16 21 18.1	-50 09 47	333.4624	-0.1601	G333.466-0.164	333.47-0.17	Image	Descr	6.6 GHz (II);	-42.4	41	-37	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September
46	16 21 13.7	-49 58 49	333.5830	-0.0223	G333.583-0.022	333.58-0.02	Image	Descr	6.6 GHz (II);	-35.9	39	-34	Hobart_26m	420	+CH₃OH II	SFR		1993 April - 1994 September
47	16 23 32.6	-50 12 05	333.6885	-0.4414	G333.683-0.437	333.69-0.44	Image		6.6 GHz (II);	-5.2	19	-4	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
48	16 23 19.5	-49 48 14	333.9464	-0.1368	G333.931-0.135	333.95-0.14	Image		6.6 GHz (II);	-36.8	7	-36	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II	SFR		1993 April - 1994 September
49	16 25 51.1	-49 13 07	334.6513	-0.0193	G334.635-0.015	334.65-0.02	Image		6.6 GHz (II);	-30.1	61	-27	Hobart_26m	420	+H₂O -CH₃OH I +CH₃OH II	EVOLVED		1993 April - 1994 September
50	16 29 28.9	-49 11 36	335.0806	-0.4290	G335.060-0.427	335.08-0.43	Image		6.6 GHz (II);	-47	15	-39	Hobart_26m	420	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		1993 April - 1994 September

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 'ELL96B' 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 'ELL96B' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

ELL96B - A survey of the Galactic plane for 6.7-GHz methanol masers - I. l=325-335 b=-0.53-0.53

View as list of objects

Detection table from Ellingsen et al. (1996)