2001MNRAS.323..939C

Query : 2001MNRAS.323..939C

2001MNRAS.323..939C - Mon. Not. R. Astron. Soc., 323, 939-951 (2001/June-1)

Multitransition study and new detections of class II methanol masers.

CRAGG D.M., SOBOLEV A.M., ELLINGSEN S.P., CASWELL J.L., GODFREY P.D., SALII S.V. and DODSON R.G.

Abstract (from CDS):

We have used the ATNF Mopra antenna and the SEST antenna to search in the directions of several class II methanol maser sources for emission from six methanol transitions in the frequency range 85-115GHz. The transitions were selected from excitation studies as potential maser candidates. Methanol emission at one or more frequencies was detected from five of the maser sources, as well as from Orion KL. Although the lines are weak, we find evidence of maser origin for three new lines in G345.01+1.79, and possibly one new line in G9.62+0.20.

The observations, together with published maser observations at other frequencies, are compared with methanol maser modelling for G345.01+1.79 and NGC 6334F. We find that the majority of observations in both sources are consistent with a warm dust (175K) pumping model at hydrogen density ∼106cm–3 and methanol column density ∼5x1017cm–2. The substantial differences between the maser spectra in the two sources can be attributed to the geometry of the maser region.


Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): masers - Hii regions - ISM: molecules - radio lines: ISM

Simbad objects: 22

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Number of rows : 22
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 Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
2 MMB G188.946+00.886 Mas 06 08 53.3441 +21 38 29.099           ~ 31 0
3 OH 305.21+00.21 Mas 13 11 13.7017 -62 34 41.397           ~ 24 0
4 OH 309.92+00.48 Mas 13 50 41.78 -61 35 10.2           ~ 50 0
5 OH 318.95-00.20 Y*O 15 00 55.35024 -58 58 53.2848           ~ 85 1
6 OH 323.74-00.26 Mas 15 31 45.45 -56 30 50.1           ~ 38 0
7 Caswell CH3OH 328.809+00.633 Mas 15 55 48.70 -52 43 05.5           ~ 24 0
8 OH 336.018-00.827 Mas 16 35 09.35 -48 46 47.1           ~ 12 0
9 OH 339.88-01.26 Y*O 16 52 04.6776 -46 08 34.404           ~ 119 1
10 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 49 0
11 OH 345.01+01.79 Mas 16 56 47.58 -40 14 25.8           ~ 72 0
12 OH 345.00-00.22 Mas 17 05 09.5 -41 29 04           ~ 34 0
13 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
14 OH 351.75-00.53 Mas 17 26 42.57 -36 09 17.6           ~ 74 1
15 OH 009.621+00.196 Mas 18 06 14.6600 -20 31 31.700           ~ 56 0
16 MMB G010.472+00.027 cor 18 08 38.2290 -19 51 50.262           ~ 83 1
17 W 31 SFR 18 10 28.6 -19 55 51           ~ 280 0
18 OH 012.68-00.18 Mas 18 13 54.7457 -18 01 46.588           ~ 49 0
19 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
20 Caswell CH3OH 023.01-00.41 Mas 18 34 39.9 -09 00 44           ~ 17 0
21 Caswell CH3OH 031.28+00.06 Mas 18 48 12.7 -01 26 36           ~ 9 1
22 Caswell CH3OH 035.20-01.74 Mas 19 01 45.5 +01 13 28           ~ 21 0

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