Hostname: page-component-7c8c6479df-ph5wq Total loading time: 0 Render date: 2024-03-29T14:48:24.850Z Has data issue: false hasContentIssue false

Towards constraining the environments of methanol masers

Published online by Cambridge University Press:  01 March 2007

M. Szymczak
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Poland email: msz@astro.uni.torun.pl, annan@astro.uni.torun.pl
A. Bartkiewicz
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Poland email: msz@astro.uni.torun.pl, annan@astro.uni.torun.pl
A. M. S. Richards
Affiliation:
Jodrell Bank Observatory, University of Manchester, UK email: amsr@jb.man.ac.uk
Rights & Permissions [Opens in a new window]

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.

Observations of 10 transitions of HCO+, CO and CS isotopomers were taken with the IRAM 30 m telescope for a sample of 28 methanol maser sources detected in the Torun unbiased survey of the galactic plane. About 64% of the sources show line wings in one or more transitions, indicating the presence of molecular outflows. Two sources show evidence for infall motion. Comparison of the widths of line wings and methanol maser emission suggests that the 6.7 GHz maser line traces the environment of massive young stellar objects of various kinematic regimes. Calculations based on the CO and HCO+ lines and the CS line intensity ratios refine the physical parameters. Specifically, a gas density of <107 cm−3 is sufficient for strong maser emission and a high methanol fractional abundance (>5×10−7) is required.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Ellingsen, S. P., von Bibra, M. L., McCulloch, P. M. et al. 1996, MNRAS 280, 378CrossRefGoogle Scholar
Niezurawska, A., Szymczak, M., Richards, A. M. S., & Cohen, R. J. 2005, BaltA 14, 429Google Scholar
Pandian, J. D., Goldsmith, P. F., & Deshpande, A. A. 2007, ApJ 656, 255CrossRefGoogle Scholar
Purcell, C.R., Balasubramanyam, R., Burton, M.G. et al. 2006 MNRAS 367, 553CrossRefGoogle Scholar
Szymczak, M., Kus, A. J., Hrynek, G., Kepa, A., & Pazderski, E. 2002, A&A 392, 277Google Scholar