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G23.657−0.127, what can we learn from a perfect methanol maser source?

Published online by Cambridge University Press:  01 March 2007

Anna Bartkiewicz ,
Huib Jan van Langevelde ,
Marian Szymczak  and
Andreas Brunthaler
Anna Bartkiewicz
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, Torun, Poland email: annan@astro.uni.torun.pl
Huib Jan van Langevelde
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, email: langevelde@jive.nl Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
Marian Szymczak
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, Torun, Poland email: annan@astro.uni.torun.pl
Andreas Brunthaler
Affiliation:
Max Planck Institute fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany email: brunthal@mpifr-bonn.mpg.de
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Abstract

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In the course of following up compact methanol masers at 6.7 GHz which were found in the Torun blind survey (Szymczak et al. 2002), we discovered a ring structure in the source G23.657−00.127. This source provides interesting insights into whether methanol masers arise in rotating disks around massive stars, in their outflows, or behind shocks. By monitoring the 12.2 GHz masers, which fortunately follow the same structure, we hope to resolve the kinematics of the ring. Moreover, the symmetry of the source points to the existence of a central source. Early results on the nature of this source indicate the existence of a hyper–compact H II region.

Keywords

methanol maserstars: formationinstrumentation: high angular resolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 190 - 191
Copyright
Copyright © International Astronomical Union 2008

References

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Szymczak, M., Kus, A. J., Hrynek, G., Kepa, A. & Pazderski, E. 2002, A&A 392, 277Google Scholar
Walsh, A. J., Burton, M. G., Hyland, A. R. & Robinson, G. 1999, MNRAS 309, 905Google Scholar