Hostname: page-component-745bb68f8f-v2bm5 Total loading time: 0 Render date: 2025-01-15T08:57:11.165Z Has data issue: false hasContentIssue false
  • English
  • Français

Methanol Masers in W3(OH)

Published online by Cambridge University Press:  07 August 2017

Qin Zeng
Qin Zeng*
Affiliation:
Purple Mountain Obsevatory 210008 Nanjing P.R. China

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The formation conditions of the methanol masers in W3(OH) are studied separately. The lower limits of the densities of the A- and E-type maser regions are 105 and 106 cm−3. The A-type maser requires a stronger excitation from HII region, than the E-type maser. The relative abundance of methanol to molecular hydrogen is more than 5×10−5. The calculation indicates that there are maser series (J0-(J+1)-1) E, (J1-(J+1)0) E J=1,2 and (J2-(J+1)1) A+ J=7,8,9 in W3(OH).

Type
Chemistry of Interface Regions
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 341 - 344
Copyright
Copyright © Kluwer 1992 

References

REFERENCES

Batrla, W., Matthews, H.E., Menten, K.M., Walmsley, C.M. (1987) ‘Detection of strong methanol masers towards galatic HII regions’, Nature 326(5), 49–51 Google Scholar
Goldreich, P., Kwan, J. (1974) ‘Molecular clouds’, Astrophys. J. 189, 441–453 Google Scholar
Lees, R.M. (1973) ‘On the E2-E1 labeling of energy levels and the anomalous excitation of interstellar methanol’, Astrophys. J. 184, 763–771 CrossRefGoogle Scholar
Lees, R.M., Lovas, F.G., Kirchhoff, W.H., Johnson, D.R. (1973) ‘Microwave spectra of molecules of astrophysical interest III. Methanol’, J. Phys. Chem. Ref. Data, 2, 205–214 Google Scholar
Lovas, F.J., Suenram, R.D., Snyder, L.E., Hollis, J.M., Lees, R.M. (1982) ‘Detection of the torsionally excited state of methanol in Orion A’, Astrophys. J. 253, 149–153 CrossRefGoogle Scholar
Menten, K.M., Johnston, K.J., Wadiak, E.J., Walmsley, C.M., Wilson, T.L. (1988a) ‘High resolution VLA observations of the W3(OH) methanol masers’, Astrophys. J., 331, L41–L45 Google Scholar
Menten, R.M., Reid, M.J., Moran, J.M., Wilson, T.L., Johnston, K.J. Batrla, W. (1988b) ‘VLBI observations of 12 GHz methanol masers’, Astrophys. J. 333, L83–L86 CrossRefGoogle Scholar
Moruzzi, G., Riminucci, P., Strumia, F., Carli, B., Carlotti, M., Lees, R.M., Mukhopadhyay, I., Johns, J.W.C., Winnewisser, B.P., Winnewisser, M. (1990) ‘The spectrum of CH3OH between 100 and 200 cm torsional and forbidden transitions’, J. Mole. Spectro. 144, 139–200 Google Scholar
Pei, C.C., Zeng, Q., Gou, Q.Q. (1988) ‘Einstein A-values of A-type methanol’, Astron. Astrophys. Suppl. Ser. 76, 35–52 Google Scholar
Thronson, H.A. Jr., Harper, D.A. (1979) ‘Compact HII regions in the far -infrared’, Astrophys. J. 230, 133–148 Google Scholar
Wilson, T.L., Walmsley, C.M., Snyder, L.E., Jewell, P.R. (1984) ‘Detection of a new type of methanol maser’, Astron. Astrophys. 134, L7–L10 Google Scholar
Wilson, T.L., Walmsley, C.M., Menten, R.M., Hersen, W. (1985) ‘The discovery of a new masering transition of interstellar methanol’, Astron. Astrophys. 147, L19–L22 Google Scholar
Zeng, Q., Lou, G.F. (1990) ‘Interstellar A-type methanol masers’, Astron. Astrophys. 228, 480–482 (Paper I) Google Scholar
Zeng, Q., Lou, G.F., Li, S.Z. (1987) ‘The masers of E-type methanol in Orion KL and Sgr B2’, Astrophys. Space Sci. 132, 263–268 (Paper II) Google Scholar