2002A&A...392..277S

Query : 2002A&A...392..277S

2002A&A...392..277S - Astronomy and Astrophysics, volume 392277-286 (2002/9-2)

6.7 GHz methanol masers at sites of star formation. A blind survey of the Galactic plane between 20°≤l≤40° and |b|≤0.52°.

SZYMCZAK M., KUS A.J., HRYNEK G., KEPA A. and PAZDERSKI E.

Abstract (from CDS):

We report the results of an unbiased survey for 6.7 GHz methanol maser emission of a ∼21deg2 strip of the Galactic plane carried out with the 32m Torun radio telescope. An area at 20°≤l≤40°, |b|≤0.52° was surveyed in an equilateral triangular grid with a sensitivity limit of about 1.6Jy. We detected a total of 100 sources, 26 of which are new detections. All the new sources are of moderate intensity and their peak flux densities have median value of 6.5Jy, i.e. about half that of previously known sources in the sample. About 80% of maser sources have IR counterpart candidates within a 1' radius but not all the IRAS counterparts of methanol masers have colours typical of ultracompact HII regions. An excess of masers unassociated with IR sources occurs at 30°<l<35° because of incompleteness of IR catalogues due to strong confusion near the tangential region of the spiral arm. Our unbiased survey doubled the number of detections as compared to IRAS-based observations. Within the positional uncertainty of 1' about one third of the methanol sources have radio continuum counterparts at 5GHz of a flux density greater than 2.5-10mJy. The distribution of methanol sources appears to be consistent with a clustered mode of formation of massive stars.

Abstract Copyright: ∼

Journal keyword(s): masers - surveys - stars: formation - ISM: molecules - radio lines: ISM - HII regions

Nomenclature: Table 1: [SKH2002] LL.ll+B.bb N=100.

Simbad objects: 157

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Number of rows : 157
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [M91] B182455.8-111624 Mas 18 27 44.1 -11 14 54           ~ 12 0
2 IRAS 18249-1116 Y*? 18 27 44.98032 -11 14 47.5044           ~ 34 0
3 AKARI-IRC-V1 J1828105-112857 SFR 18 28 10.37 -11 28 49.8           ~ 113 1
4 RAFGL 5491 mul 18 28 10.7 -11 29 01           ~ 46 0
5 IRAS 18278-0936 IR 18 30 35.0 -09 34 46           ~ 8 0
6 [SHK2000] 18278-0936 Mas 18 30 35.7 -09 34 26           ~ 5 0
7 IRAS 18278-1009 Y*O 18 30 36.0537219097 -10 07 09.780190865           ~ 41 0
8 [SHK2000] 18278-1009 Mas 18 30 36.5 -10 06 44           ~ 5 0
9 [M91] B182816.1-095101 Mas 18 31 02 -09 49.1           ~ 7 0
10 GAL 021.87+00.01 HII 18 31 02.5 -09 49 30           ~ 20 0
11 [SHK2000] 18282-1024 Mas 18 31 06.3 -10 21 37           ~ 5 0
12 GAL 022.357+00.066 HII 18 31 44.9 -09 22 09           ~ 55 0
13 [SHK2000] 18290-0924 Mas 18 31 45.6 -09 22 44           ~ 5 0
14 IRAS 18297-0931 FIR 18 32 29.5 -09 29 14           ~ 6 0
15 Caswell CH3OH 022.34-00.16 Mas 18 32 32.1 -09 29 10           ~ 4 0
16 [SKH2002] 22.45-0.17 Mas 18 32 45.8 -09 24 06           ~ 3 0
17 [SHK2000] 18305-0826 Mas 18 33 13.1 -08 23 56           ~ 6 0
18 IRAS 18305-0826 Y*O 18 33 14.3240 -08 23 57.500           ~ 24 0
19 [SVG93] 183108.2-082540 Mas 18 33 47.4 -08 21 37           ~ 5 0
20 GAL 023.24-00.24 HII 18 34 29.9 -08 43 23           ~ 23 0
21 [SVG93] 183146.3-084539 Mas 18 34 30.8 -08 42 42           ~ 5 0
22 [M91] B183155.8-083417 Mas 18 34 39.0 -08 31 36           ~ 11 0
23 2MASS J18343926-0831273 * 18 34 39.2660072640 -08 31 27.424952004           ~ 2 0
24 Caswell CH3OH 023.01-00.41 Mas 18 34 39.9 -09 00 44           ~ 17 0
25 2MASS J18344002-0900377 * 18 34 40.0281795864 -09 00 37.736447256           ~ 2 0
26 IRAS 18321-0820 Y*O 18 34 51.5650 -08 18 21.305           ~ 52 0
27 [SHK2000] 18322-0721 Mas 18 34 53.0 -07 19 11           ~ 5 0
28 [SHK2000] 18321-0854 Mas 18 34 54.5 -08 50 04           ~ 7 0
29 IRAS 18322-0721 IR 18 34 55.8 -07 19 16           ~ 8 0
30 IRAS 18324-0737 mm 18 35 08.1 -07 35 04           ~ 23 0
31 [M91] B183232.3-073824 Mas 18 35 09.4 -07 34 58           ~ 11 0
32 OH 024.148-00.009 Mas 18 35 20.974 -07 48 55.32           ~ 7 0
33 IRAS 18326-0751 IR 18 35 21.2 -07 48 45           ~ 8 0
34 [SHK2000] 18326-0802 Mas 18 35 22.9 -08 01 11           ~ 5 0
35 [SKH2002] 24.51-0.05 Mas 18 36 08.7 -07 30 55           ~ 3 0
36 IRAS 18334-0733 IR 18 36 11.0 -07 31 12           ~ 13 0
37 Caswell CH3OH 024.79+00.08 Mas 18 36 12.1 -07 12 13           ~ 8 0
38 [TFP98] g02478-1 NIR 18 36 12.252 -07 12 05.39           ~ 2 0
39 IRAS 18335-0711 HII 18 36 17.1 -07 09 02           ~ 17 0
40 Caswell CH3OH 024.85+00.09 Mas 18 36 17.2 -07 09 01           ~ 5 0
41 IRAS 18337-0707 IR 18 36 27.9 -07 05 13           ~ 7 0
42 [SKH2002] 24.93+0.08 Mas 18 36 29.2 -07 05 05           ~ 4 0
43 AGAL G025.409+00.106 cor 18 37 16 -06 38.6           ~ 57 0
44 [VGM95] 183436.9-064115 Mas 18 37 18.3 -06 38 38           ~ 7 0
45 IRAS 18346-0734 mul 18 37 21.9 -07 31 42           ~ 5 0
46 [SKH2002] 24.64-0.33 Mas 18 37 25.2 -07 31 53           ~ 4 0
47 OH 025.709+00.044 Mas 18 38 03.1450 -06 24 15.190           ~ 19 0
48 [SVG93] 183626.4-062714 Mas 18 39 04.7 -06 24 17           ~ 10 0
49 [SHK2000] 18372-0537 Mas 18 39 51.8 -05 34 52           ~ 5 0
50 IRAS 18372-0537 HII 18 39 52.7 -05 35 07           ~ 8 0
51 [SHK2000] 18372-0541 Mas 18 39 52.8 -05 38 48           ~ 5 0
52 [SKH2002] 27.21+0.26 Mas 18 40 03.8 -04 58 09           ~ 4 0
53 AGAL G027.221+00.137 Y*O 18 40 31 -05 01.1           ~ 24 0
54 [GVS2000] 18379-0500 Mas 18 40 33.9 -04 57 18           ~ 6 0
55 SNR G027.3+00.1 SNR 18 40 35.3 -04 57 44           ~ 22 0
56 [VGM95] 183758.2-054628 Mas 18 40 38.6 -05 43 37           ~ 5 0
57 [SHK2000] 18392-0436 Mas 18 41 47.5 -04 33 11           ~ 5 0
58 IRAS 18391-0504 FIR 18 41 50.2 -05 01 21           ~ 8 0
59 Caswell CH3OH 027.36-00.16 Mas 18 41 50.6 -05 01 47           ~ 14 0
60 [SKH2002] 28.85+0.50 Mas 18 42 12.8 -03 24 26           ~ 5 0
61 [SKH2002] 28.69+0.41 Mas 18 42 13.6 -03 35 07           ~ 4 0
62 IRAS 18396-0337 IR 18 42 14.3 -03 34 57           ~ 3 0
63 [SKH2002] 28.82+0.37 Mas 18 42 35.2 -03 29 26           ~ 6 0
64 Caswell CH3OH 028.15+00.00 Mas 18 42 40.9 -04 15 26           ~ 11 0
65 [SHK2000] 18402-0403 Mas 18 42 54.5 -04 00 04           ~ 5 0
66 IRAS 18402-0403 IR 18 42 54.9 -04 00 13           ~ 14 0
67 IRAS 18403-0354 Y*? 18 42 56.480 -03 51 21.47           ~ 6 0
68 [SKH2002] 28.53+0.12 Mas 18 42 57.7 -03 51 59           ~ 4 0
69 [SKH2002] 28.19-0.05 Mas 18 42 57.8 -04 14 21           ~ 3 0
70 Caswell CH3OH 028.20-00.05 Mas 18 42 58.0 -04 14 01           ~ 5 0
71 GAL 028.20-00.04 HII 18 42 58.08 -04 14 04.6           ~ 61 0
72 [SKH2002] 28.02-0.44 Mas 18 44 02.1 -04 34 14           ~ 5 0
73 [SVG93] 184145.8-042052 Mas 18 44 24.5 -04 17 45           ~ 6 0
74 Caswell CH3OH 028.84-00.23 Mas 18 44 47.6 -03 44 49           ~ 4 0
75 [M91] B184212.4-034908 Mas 18 44 50.0 -03 45 23           ~ 3 0
76 Caswell OH 028.83-00.25 Mas 18 44 50.63 -03 46 03.8           ~ 29 0
77 IRAS 18421-0348 Cld 18 44 51.414 -03 45 28.68           ~ 29 0
78 [SKH2002] 29.31-0.15 Mas 18 45 23.1 -03 17 23           ~ 4 0
79 IRAS 18427-0320 IR 18 45 24.4 -03 17 16           ~ 3 0
80 HFE 56 IR 18 45.9 -02 46           ~ 2 0
81 AGAL G029.862-00.044 Mas 18 45 59.437 -02 45 05.78           ~ 31 0
82 [M91] B184327.1-024236 Mas 18 46 03.6 -02 39 24           ~ 14 1
83 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 385 0
84 [SKH2002] 29.97-0.04 Mas 18 46 11.4 -02 39 14           ~ 4 0
85 Caswell CH3OH 029.98-00.04 Mas 18 46 11.7 -02 39 04           ~ 5 0
86 [SHK2000] 18438-0222 Mas 18 46 23.7 -02 17 56           ~ 6 0
87 [M91] B184400.5-014829 Mas 18 46 36.4 -01 45 24           ~ 4 0
88 IRAS 18440-0148 cor 18 46 36.56 -01 45 21.2           ~ 65 0
89 AGAL G030.779+00.231 Mas 18 46 42 -01 48.6           ~ 24 0
90 IRAS 18441-0134 HII 18 46 44.3 -01 30 55           ~ 12 0
91 [SHK2000] 18441-0134 Mas 18 46 46.2 -01 31 06           ~ 5 0
92 Caswell CH3OH 030.79+00.20 Mas 18 46 48.2 -01 48 46           ~ 8 0
93 Caswell CH3OH 030.20-00.17 Mas 18 47 02.5 -02 30 38           ~ 9 0
94 [SKH2002] 30.89+0.17 Mas 18 47 07.3 -01 44 15           ~ 2 0
95 AGAL G030.224-00.179 Mas 18 47 08 -02 29.5           ~ 18 0
96 [SKH2002] 30.22-0.19 Mas 18 47 09.8 -02 29 38           ~ 3 0
97 IRAS 18446-0209 Y*O 18 47 18.91 -02 06 17.0           ~ 26 0
98 Caswell CH3OH 031.41+00.31 Mas 18 47 33.1 -01 12 38           ~ 7 0
99 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 430 1
100 AGAL G030.703-00.067 cor 18 47 36.6 -02 00 54           ~ 87 0
101 [SKH2002] 30.59-0.13 Mas 18 47 37.2 -02 08 46           ~ 3 0
102 GAL 030.76-00.05 HII 18 47 38.9 -01 57 25           ~ 23 0
103 Caswell CH3OH 030.76-00.05 Mas 18 47 38.9 -01 57 25           ~ 3 1
104 [SHK2000] 18452-0141 Mas 18 47 45.6 -01 37 19           ~ 4 0
105 AGAL G030.818-00.056 cor 18 47 47.0 -01 54 28           ~ 186 0
106 [SKH2002] 30.40-0.29 Mas 18 47 51.2 -02 23 15           ~ 4 0
107 [SHK2000] 18454-0136 Mas 18 48 00.3 -01 34 01           ~ 4 0
108 AGAL G031.158+00.047 cor 18 48 02.46 -01 33 26.5           ~ 45 0
109 [M91] B184536.8-012912 Mas 18 48 10.9 -01 26 44           ~ 2 0
110 [SKH2002] 30.96-0.14 Mas 18 48 19.7 -01 48 59           ~ 2 0
111 [SHK2000] 18461-0113 Mas 18 48 44.3 -01 11 18           ~ 7 0
112 AGAL G032.044+00.059 cor 18 49 36.6 -00 45 49           ~ 48 0
113 [PMB2005] CH3OH 032.03+00.06 Mas 18 49 37.300 -00 45 47.00           ~ 6 0
114 IRAS 18487-0015 IR 18 51 20.6 -00 11 46           ~ 23 0
115 Caswell CH3OH 032.74-00.08 Mas 18 51 21.8 -00 12 13           ~ 14 0
116 IRAS 18488+0000 IR 18 51 24.8 +00 04 19           ~ 32 0
117 [VGM95] 184854.1+000036 Mas 18 51 27.8 +00 04 14           ~ 5 0
118 Caswell CH3OH 033.09-00.07 Y*? 18 51 58.772 +00 06 31.56           ~ 6 0
119 [SKH2002] 33.10-0.06 Mas 18 51 58.9 +00 07 27           ~ 3 0
120 OH 033.1-00.1 Mas 18 52 07.3 +00 08 06           ~ 21 0
121 GAL 033.13-00.09 HII 18 52 07.96 +00 08 11.6           ~ 27 1
122 [SHK2000] 18497+0022 Mas 18 52 10.6 +00 25 09           ~ 4 0
123 [SKH2002] 33.86+0.01 Mas 18 53 05.2 +00 49 36           ~ 3 0
124 [SKH2002] 34.25+0.16 Mas 18 53 16.7 +01 14 49           ~ 2 0
125 GRS G034.25 +00.14 HII 18 53.3 +01 14           ~ 3 0
126 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
127 JCMTSF J185321.7+011338 Mas 18 53 21.4 +01 13 43           ~ 7 0
128 [SKH2002] 34.40+0.21 Mas 18 53 21.5 +01 24 09           ~ 2 0
129 [SHK2000] 18508+0052 Mas 18 53 24.1 +00 55 13           ~ 4 0
130 [SKH2002] 33.74-0.15 Mas 18 53 26.9 +00 39 01           ~ 3 0
131 [BK2004] J185328.7+003158 Mas 18 53 28.7 +00 31 58           ~ 15 0
132 [SKH2002] 34.10+0.01 Mas 18 53 31.9 +01 02 26           ~ 3 0
133 Caswell CH3OH 035.02+00.35 Mas 18 54 00.6 +02 00 50           ~ 5 0
134 [SKH2002] 34.74-0.09 Mas 18 55 03.4 +01 34 17           ~ 3 0
135 [SHK2000] 18527+0301 Mas 18 55 15.6 +03 04 42           ~ 7 0
136 [ERG2015] 6375 smm 18 55 16.778 +03 05 07.47           ~ 30 0
137 [SKH2002] 35.79-0.17 Mas 18 57 16.1 +02 27 44           ~ 4 0
138 IRAS 18547+0223 MIR 18 57 17.3 +02 27 58           ~ 8 0
139 IRAS 18554+0319 IR 18 57 59.0 +03 23 55           ~ 8 0
140 [SKH2002] 36.70+0.09 Mas 18 58 00.9 +03 23 30           ~ 6 0
141 IRAS 18559+0416 IR 18 58 27.1 +04 20 46           ~ 6 0
142 [SKH2002] 37.60+0.42 Mas 18 58 28.5 +04 20 34           ~ 4 0
143 [SKH2002] 37.02-0.03 Mas 18 58 59.9 +03 37 40           ~ 4 0
144 IRAS 18566+0408 Y*O 18 59 09.95520 +04 12 15.6240           ~ 143 0
145 [SHK2000] 18566+0408 Mas 18 59 11.6 +04 12 08           ~ 5 0
146 [HMW2016] G037.479-00.104 Mas 19 00 07.1430 +03 59 52.975           ~ 10 0
147 [SHK2000] 18577+0358 Mas 19 00 14.4 +04 02 35           ~ 5 0
148 GAL 037.55-00.11 HII 19 00 16.02 +04 03 15.1           ~ 41 0
149 IRAS 18585+0538 IR 19 00 57.8 +05 42 45           ~ 8 0
150 [SKH2002] 39.10+0.48 Mas 19 00 59.5 +05 42 28           ~ 3 0
151 [SKH2002] 38.20-0.08 Mas 19 01 22.8 +04 39 10           ~ 4 0
152 IRAS 18589+0437 Y*? 19 01 26.21952 +04 42 17.4924           ~ 14 0
153 [SKH2002] 38.26-0.08 Mas 19 01 28.7 +04 42 02           ~ 3 0
154 HRDS G038.120-00.227 HII 19 01 43.8 +04 30 44           ~ 9 0
155 [SHK2000] 18592+0426 Mas 19 01 47.6 +04 30 32           ~ 5 0
156 [HMW2016] G038.037-00.300 Mas 19 01 50.4676 +04 24 18.900           ~ 9 0
157 IRAS 18593+0419 IR 19 01 51.3 +04 24 22           ~ 4 0

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