1999A&A...343..939R

Query : 1999A&A...343..939R

1999A&A...343..939R - Astronomy and Astrophysics, volume 343939-942 (1999/3-3)

A search for methanol masers at 9.978GHz and 10.058GHz.

ROELLIG M., KEGEL W.H., MAUERSBERGER R. and DOERR C.

Abstract (from CDS):

We performed NLTE-radiative transfer calculations for interstellar A-type methanol maser lines in order to find out under which physical conditions the level populations show strong inversion. In our model we considered collisional as well as radiative pumping and accounted for line overlap as well as for torsional excitation of the methanol molecules. The radiation field was calculated using a simple on-the-spot approximation. Our results show that torsional excitation can be essential for the maser pumping mechanism while line overlap appears to be of minor importance. In addition to the well known Class I and Class II maser lines, we found two new transitions which possibly may show up as strong masers. These are the 43-52A– and A+ transitions at 10.058GHz and 9.978GHz respectively. These masers are radiatively pumped by IR radiation, i.e. they should be found near IR sources similar to the classical Class II methanol masers. 88 galactic CH3OH maser sources were searched for emission in these two lines, but no detection was made. Upper limits are given and discussed.

Abstract Copyright: ∼

Journal keyword(s): radio lines: ISM - ISM: HII regions - ISM: molecules - radiative transfer - masers

Simbad objects: 95

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Number of rows : 95
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 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
2 SH 2-231 Y*O 05 39 13.2 +35 45 48           ~ 135 0
3 [M91] B053606.4+352921 Mas 05 39 27.6 +35 30 58           ~ 9 0
4 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
5 SH 2-252 A HII 06 08 33 +20 39.3           ~ 75 0
6 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 270 3
7 MMB G192.600-00.048 Y*O 06 12 54.0100 +17 59 23.200           ~ 430 0
8 IC 2162 HII 06 13 04.1 +17 58 44           ~ 372 2
9 LBN 196.49-01.60 HII 06 14 38.29 +13 49 41.0           ~ 169 1
10 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
11 OH 345.01+01.79 Mas 16 56 47.58 -40 14 25.8           ~ 72 0
12 OH 344.58-00.02 Y*? 17 02 57.71 -41 41 53.8           ~ 43 0
13 OH 345.50+00.35 Mas 17 04 22.91 -40 44 21.7           ~ 50 0
14 OH 345.00-00.22 Mas 17 05 09.5 -41 29 04           ~ 34 0
15 OH 345.70-00.09 Y*O 17 06 50.635 -40 50 59.49           ~ 37 0
16 OH 350.113+00.095 Mas 17 19 25.609 -37 10 05.38           ~ 17 0
17 BFS 65 HII 17 20 06.91 -38 57 34.1           ~ 81 1
18 NGC 6334B rG 17 20 21.810 -35 52 48.25           ~ 113 0
19 GAL 351.31+00.6 HII 17 20 31 -35 51.6           ~ 46 0
20 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
21 OH 351.75-00.53 Mas 17 26 42.57 -36 09 17.6           ~ 74 1
22 OH 354.61+00.47 Mas 17 30 17.13 -33 13 55.1           ~ 35 0
23 OH 353.41-00.36 Mas 17 30 26.18 -34 41 45.6           ~ 65 0
24 OH 355.34+00.15 Mas 17 33 29.06 -32 47 58.9           ~ 28 0
25 OH 359.14+00.03 Mas 17 43 25.6109 -29 39 17.551           ~ 36 0
26 OH 359.44-00.10 Mas 17 44 40.60 -29 28 16.0           ~ 26 0
27 NAME Sgr A-F Rad 17 45 38.18 -29 03 28.1           ~ 29 0
28 OH 359.62-00.25 Mas 17 45 39.0697 -29 23 30.265           ~ 35 0
29 NAME Sgr A A MoC 17 45 52.00 -28 59 26.2           ~ 41 0
30 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
31 OH 000.55-00.85 Mas 17 50 14.35 -28 54 31.1           ~ 34 0
32 OH 002.14+00.01 Mas 17 50 36.14 -27 05 46.5           ~ 20 0
33 OH 003.94+00.00 OH* 17 54 45.04152 -25 33 21.9276           O-rich 21 1
34 OH 009.620+00.194 Mas 18 06 14.87 -20 31 36.7           ~ 19 0
35 GAL 008.67-00.37 Mas 18 06 19.2 -21 37 38           ~ 4 0
36 W 31 SFR 18 10 28.6 -19 55 51           ~ 280 0
37 OH 010.62-00.38 Mas 18 10 28.65 -19 55 49.5           ~ 28 0
38 OH 012.889+00.489 Mas 18 11 51.4450 -17 31 29.412           ~ 48 0
39 OH 012.03-00.04 Y*O 18 12 01.8400 -18 31 55.800           ~ 91 0
40 OH 011.90-00.14 Mas 18 12 11.44 -18 41 28.6           ~ 25 0
41 OH 012.22-00.12 Mas 18 12 44.45 -18 24 24.6           ~ 25 0
42 W 33b SFR 18 13 54.68 -18 01 48.1           ~ 85 0
43 CORNISH G011.9368-00.6158 HII 18 14 01.0 -18 53 23           ~ 88 1
44 W 33 SFR 18 14 14.0 -17 55 50           ~ 292 0
45 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
46 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
47 EGO G016.59-0.05 HII 18 21 07.9 -14 31 53           ~ 129 0
48 OH 016.59-00.05 Mas 18 21 09.0840 -14 31 48.556           ~ 85 0
49 [BE83] Maser 018.46-00.01 Mas 18 24 37.0 -12 51 21           ~ 3 0
50 GAL 019.48+00.16 Mas 18 25 58.1 -11 52 44           ~ 4 0
51 [M91] B182455.8-111624 Mas 18 27 44.1 -11 14 54           ~ 12 0
52 AKARI-IRC-V1 J1828105-112857 SFR 18 28 10.37 -11 28 49.8           ~ 113 1
53 GAL 021.88+00.02 HII 18 31 01.4 -09 48 52           ~ 19 0
54 OH 022.44-00.18 Mas 18 32 45.8 -09 24 43           ~ 8 0
55 [TFP98] g02343-N Mas 18 34 39.5 -08 31 52           ~ 14 0
56 [SKV94] 023.01-0.41 Mas 18 34 40.94 -09 00 52.8           ~ 8 0
57 GAL 024.33+00.11 Mas 18 35 14.9 -07 35 56           ~ 7 0
58 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 120 0
59 GAL 027.35-00.20 Mas 18 41 55.6 -05 03 38           ~ 5 0
60 Caswell OH 028.21-00.05 Mas 18 43 00.3 -04 13 25           ~ 10 0
61 Caswell OH 028.83-00.25 Mas 18 44 50.63 -03 46 03.8           ~ 29 0
62 IRAS 18421-0348 Cld 18 44 51.414 -03 45 28.68           ~ 29 0
63 SRBY 162 Mas 18 46 03.6 -02 39 26           ~ 31 1
64 Caswell OH 030.82+00.28 Mas 18 46 36.3 -01 45 12           ~ 7 0
65 Caswell OH 030.22-00.15 Mas 18 47 00.6 -02 28 41           ~ 6 0
66 Caswell OH 030.60-00.06 HII 18 47 19.91 -02 05 57.0           ~ 10 0
67 [VES2000] 184458.90-020427.0 Mas 18 47 34.96 -02 01 06.0           ~ 8 0
68 [BE83] Maser 030.79-00.06 Mas 18 47 44.8 -01 55 50           ~ 2 0
69 Caswell H2O 030.81-00.06 Mas 18 47 47.0 -01 54 35           ~ 10 0
70 Caswell H2O 031.29+00.07 Mas 18 48 12.2 -01 25 48           ~ 15 0
71 Caswell OH 032.74-00.07 Mas 18 51 20.0 -00 11 51           ~ 11 0
72 OH 033.1-00.1 Mas 18 52 07.3 +00 08 06           ~ 21 0
73 OH 034.26+00.15 Mas 18 53 18.68 +01 15 00.3           ~ 31 0
74 Caswell OH 035.03+00.35 Mas 18 54 01.8 +02 01 19           ~ 14 0
75 GAL 035.2-00.74 cor 18 58 13.00 +01 40 36.0           ~ 176 0
76 OH 035.2-00.7 Mas 18 58 13.0517 +01 40 35.674           ~ 49 0
77 IRAS 18556+0136 mul 18 58 13.1 +01 40 35           ~ 142 0
78 EQ 190334.9+064155 Mas 19 06 01.1 +06 46 35           ~ 18 0
79 W 49n HII 19 10 13.2 +09 06 12           ~ 497 3
80 IRAS 19095+0930 cor 19 11 54.09216 +09 35 49.6896           ~ 115 0
81 IRAS 19110+1045 Y*O 19 13 22.0427 +10 50 53.336           ~ 132 0
82 Caswell OH 045.47+00.13 Mas 19 14 07.4 +11 12 20           ~ 15 0
83 Caswell H2O 045.47+00.05 Mas 19 14 25.7 +11 09 30           ~ 9 0
84 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
85 [KCW94] 069.540-00.975 HII 20 10 08.95 +31 31 35.4           ~ 168 1
86 IRAS 20081+3122 Y*O 20 10 09.036 +31 31 34.14           ~ 172 0
87 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 194 0
88 OH 075.8+00.3 HII 20 21 43.8 +37 26 39           ~ 95 2
89 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
90 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 91 0
91 DR 21 (OH) cor 20 39 01.01 +42 22 50.2           ~ 427 0
92 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
93 V* V645 Cyg Ae* 21 39 58.2745507632 +50 14 21.042184668   14.23 13.10 13.82   O6/9eq 279 0
94 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
95 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1

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