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Molecular properties of (U)LIRGs: CO, HCN, HNC and HCO+

Published online by Cambridge University Press:  01 March 2007

A. F. Loenen ,
W. A. Baan  and
M. Spaans
A. F. Loenen
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, The Netherlands email: [email protected], [email protected] ASTRON, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands email: [email protected]
W. A. Baan
Affiliation:
ASTRON, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands email: [email protected]
M. Spaans
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, The Netherlands email: [email protected], [email protected]
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Abstract

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The observed molecular properties of a sample of FIR-luminous and OH megamaser (OH-MM) galaxies have been investigated. The ratio of high and low-density tracer lines is found to be determined by the progression of the star formation in the system. The HCO+/HCN and HCO+/HNC line ratios are good proxies for the density of the gas, and PDR and XDR sources can be distinguished using the HNC/HCN line ratio. The properties of the OH-MM sources in the sample can be explained by PDR chemistry in gas with densities higher than 105.5cm−3, confirming the classical OH-MM model of IR pumped amplification with (variable) low gains.

Keywords

galaxies: nucleigalaxies: ISMgalaxies: activegalaxies: starburstISM: moleculesISM: evolutionradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 462 - 466
Copyright
Copyright © International Astronomical Union 2008

References

Baan, W. A. 1989, ApJ 338, 804CrossRefGoogle Scholar
Baan, W. A., Henkel, C., Loenen, A. F., Baudry, A., & Wiklind, T. 2007, submitted to A&AGoogle Scholar
Baan, W. A., & Klöckner, H.-R. 2006, A&A, 449, 559Google Scholar
Dickinson, D. F., Dinger, A. S. C., Kuiper, T. B. H., & Rodriguez Kuiper, E. N. 1980, ApJ, 237, L43CrossRefGoogle Scholar
Genzel, R., et al. 1998, ApJ 4498, 579CrossRefGoogle Scholar
Loenen, A. F., BaanW., A. W., A., & Spaans, M. 2006, A&A 458, 89Google Scholar
Loenen, A. F., Baan, W. A., & Spaans, M. 2007, in preparationGoogle Scholar
Meijerink, R., & Spaans, M. 2005, A&A 436, 397Google Scholar
Meijerink, R., Spaans, M., & Israel, F. P. 2007, A&A 461, 793Google Scholar
Schilke, P., Walmsley, C. M., Pineau Des Forets, G. et al. 1992, A&A 256, 595Google Scholar