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Spitzer spectroscopy of unusual hydrocarbons in cool radiative environments

Published online by Cambridge University Press:  01 February 2008

G. C. Sloan
G. C. Sloan*
Affiliation:
Cornell University, Space Sciences 108, Ithaca, NY 14853-6801 email: sloan@isc.astro.cornell.edu
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Abstract

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The Spitzer Space Telescope has discovered several objects with unusual spectra, where the emission features from polycyclic aromatic hydrocarbons (PAHs) are shifted to longer wavelengths than normally observed. Previously, only two of these class C PAH spectra had been identified. The new and larger sample reveals that PAHs emit at longer wavelengths when processed by cooler radiation fields. Limited laboratory data show that samples with mixtures of aromatic and aliphatic hydrocarbons produce emission features at longer wavelengths than purely aromatic samples. The aliphatic bonds are more fragile and would only survive in cooler radiation fields. In harsher radiation fields, the aliphatics attached to the aromatic hydrocarbons are destroyed.

Keywords

Infrared: ISM(ISM:) dustextinction
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 191 - 194
Copyright
Copyright © International Astronomical Union 2008

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