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HNC and HCN in Seyfert Galaxies

Published online by Cambridge University Press:  04 October 2008

C. Kramer ,
S. Aalto ,
R. Simon ,
J.P. Pérez-Beaupuits ,
S. Aalto ,
M. Spaans  and
F. Van der Tak
J.P. Pérez-Beaupuits*
Affiliation:
Kapteyn Astronomical Institute, Rijksuniversiteit Groningen, Landleven 12, 9747 AD Groningen, The Netherlands
S. Aalto
Affiliation:
Onsala Rymdobservatorium, Chalmers Tekniska Högskola, Sweden
M. Spaans
Affiliation:
Kapteyn Astronomical Institute, Rijksuniversiteit Groningen, Landleven 12, 9747 AD Groningen, The Netherlands
F. Van der Tak
Affiliation:
SRON Netherlands Institute for Space Research, The Netherlands
*
[email protected]
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Abstract

What are the physical conditions in the nuclear region of Seyfert galaxies? Can we asses the predominant nuclear source of power starburst or AGN by using high density gas tracers? We have used SEST, JCMT, and IRAM 30 m telescopes to observe the J = 1–0, J = 3–2, and J = 4–3 transition lines of HNC and HCN in the Seyfert 2 galaxies NGC 1068 and NGC 3079. We model the excitatioon conditions of these molecules based on the observed 3–2/1–0 line intensity ratios. In these proceedings we show the line ratios and discuss the excitation conditions modeled. We summarize our results and conclusions as follows: in NGC 1068, the emission of HNC emerges from lower(< 105 cm-3) density gas than HCN (> 105 cm-3). Instead, the emission of HNC andHCN emerges from the same gas in NGC 3079. The observed HCN/HNC line ratios favor a PDR scenario rather than an XDR one. However, the N(HNC)/N(HCN) column density ratios obtained for NGC 3079 can be found only in XDR environments.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 31: Far-Infrared Workshop 2007 , 2008 , pp. 195 - 196
Copyright
© EAS, EDP Sciences, 2008

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References

Pérez-Beaupuits, J.P., Aalto, S., & Gerebro, H., 2007, A&A, 476, 177
Pérez-Beaupuits, J.P., Aalto, S., Spaans, M., Van der Tak, F., & García-Burillo, S., 2008, in preparation