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Hydrocarbon dust absorption in Seyfert galaxies and ULIRGs

Published online by Cambridge University Press:  01 December 2004

R. E. Mason ,
G. S. Wright ,
Y. J. Pendleton  and
A. J. Adamson
R. E. Mason
Affiliation:
Institute for Astronomy, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK email: rmason@noao.edu Present Address: NOAO Gemini Science Center, 950 North Cherry Ave., Tucson, AZ85719, USA
G. S. Wright
Affiliation:
UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK
Y. J. Pendleton
Affiliation:
NASA Ames Research Center, Moffet Field, CA 90345, USA
A. J. Adamson
Affiliation:
Joint Astronomy Centre, 660 North A'ohoku Place, University Park, Hilo, HI 96720, USA
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Abstract

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We present new spectroscopic observations of the 3.4μm absorption feature in a Seyfert 2 galaxy and a ULIRG. A signature of C–H bonds in aliphatic hydrocarbons, the 3.4μm feature indicates the presence of organic material in Galactic and extragalactic dust. The feature in these galaxies closely resembles that seen in the Galactic diffuse ISM and in newly-formed dust in a protoplanetary nebula. This similarity implies a common composition for the hydrocarbon component of interstellar dust in a range of galaxy types, and one which is resistant to processing in the interstellar and/or circumnuclear medium.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
POSTERS
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS222 , March 2004 , pp. 339 - 340
Copyright
© 2004 International Astronomical Union