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Models of class II methanol masers

Published online by Cambridge University Press:  03 August 2017

Andrej M. Sobolev
Affiliation:
Ural State University, Lenin str. 51, 620083 Ekaterinburg, Russia
Andrei B. Ostrovskii
Affiliation:
Ural State University, Lenin str. 51, 620083 Ekaterinburg, Russia
Alexey V. Malyshev
Affiliation:
Ural State University, Lenin str. 51, 620083 Ekaterinburg, Russia
Dinah M. Cragg
Affiliation:
Monash University, Clayton, Victoria 3800, Australia
Peter D. Godfrey
Affiliation:
Monash University, Clayton, Victoria 3800, Australia
Edmund C. Sutton
Affiliation:
University of Illinois, 1002 W. Green St., Urbana, IL 61801, USA
William D. Watson
Affiliation:
University of Illinois, 1002 W. Green St., Urbana, IL 61801, USA
Simon P. Ellingsen
Affiliation:
University of Tasmania, Hobart, Tasmania 7001, Australia
Jim L. Caswell
Affiliation:
CSIRO, Epping, NSW 2121, Australia

Abstract

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Current models of class II methanol masers are able to describe the brightnesses of the strongest masers and provide a basis for explaining observed line ratios. Determination of the physical parameters in the source requires observational data in many maser transitions. In order to provide observational constraints for models we searched for and detected 7 new methanol masers. This allowed us to constrain the physical parameters of the 3 sources with the greatest number of detected methanol maser lines: W3(OH), NGC6334F, and G345.01 + 1.79. The models accurately account for the fluxes of the bulk of the detected maser lines. Remaining discrepancies most probably reflect the fact that the most prominent components of the different maser lines are formed under different conditions. This is supported by comparison of the line profiles. We outline directions for future studies in the field.

Type
Part 1. Star Formation
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Austin, M.C., Voronkov, M.A., & Sobolev, A.M. 2000, AAS, 197, 2905 Google Scholar
Cragg, D.M., Sobolev, A.M., Ellingsen, S.P., Caswell, J.L., Godfrey, P.D., Salii, S.V., & Dodson, R.G. 2001, MNRAS, 323, 939 Google Scholar
Cragg, D.M., Johns, K.P., Godfrey, P.D., & Brown, R.D. 1992, MNRAS, 259, 203 CrossRefGoogle Scholar
Cragg, D.M., Sobolev, A.M., Ellingsen, S.P., Caswell, J.L., Godfrey, P.D., Salii, S.V., & Dodson, R.G. 2001, MNRAS, in press Google Scholar
De Buizer, J.M., Pina, R.K., & Telesco, C.M. 2000, ApJS, 130, 437 CrossRefGoogle Scholar
McCutcheon, W.H., Sandell, G., Matthews, H.E., Kuiper, T.B.H., Sutton, E.C., Danchi, W.C. & Sato, T. 2000, MNRAS, 316, 152 Google Scholar
Menten, K.M. 1991, PASP, 16, 119 Google Scholar
Menten, K.M., Walmsley, C.M., Henkel, C., Wilson, T.L., Snyder, L.E., Hollis, J.M., & Lovas, F. 1986, A&A, 169, 271 Google Scholar
Minier, V. 2000, , Onsala Space Observatory, 75 Google Scholar
Ostrovskii, A.B., & Sobolev, A.M. 2001, these proceedings Google Scholar
Peng, R.S., & Whiteoak, J.B. 1993, Lect. Notes Phys., 412, 207 Google Scholar
Sobolev, A.M. 1993, Astron. Lett., 19, 293 Google Scholar
Sobolev, A.M., Cragg, D.M., & Godfrey, P.D. 1997a, A&A, 324, 211 Google Scholar
Sobolev, A.M., Cragg, D.M., & Godfrey, P.D. 1997b, MNRAS, 288, L39 CrossRefGoogle Scholar
Sobolev, A.M., Cragg, D.M., Salii, S.V., Kalinina, N.D., & Ellingsen, S.P. 1999, Proc. 3rd Cologne-Zermatt Symposium, GCA-Verlag Herdecke, 299 Google Scholar
Sobolev, A.M., & Deguchi, S. 1994a, A&A, 291, 569 Google Scholar
Sobolev, A.M., & Deguchi, S. 1994b, ApJ, 433, 719 Google Scholar
Sobolev, A.M., Wallin, B.K., & Watson, W.D. 1998, ApJ, 498, 763 Google Scholar
Sutton, E.C., Sobolev, A.M., Ellingsen, S.P., Cragg, D.M., Mehringer, D.M., Ostrovskii, A.B., & Godfrey, P.D. 2001, ApJ, in press Google Scholar
Wilson, T.L., Walmsley, C.M., Menten, K.M., & Hermsen, W. 1985, A&A, 147, L19 Google Scholar
Zeng, Q., 1992, IAU Coll. 143, 341 Google Scholar