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Contribution of PAHs to the Interstellar Extinction Curve

Published online by Cambridge University Press:  07 August 2017

C. Joblin ,
A. Leger ,
P. Martin  and
D. Defourneau
C. Joblin
Affiliation:
Groupe de Physique des Solides, Univ. Paris 7, Tour 23, 2, place Jussieu, 75251 Paris Cédex 05, France
A. Leger
Affiliation:
Groupe de Physique des Solides, Univ. Paris 7, Tour 23, 2, place Jussieu, 75251 Paris Cédex 05, France
P. Martin
Affiliation:
LURE, bât. 209d, Univ. Paris 11, 91405 Orsay Cédex, France
D. Defourneau
Affiliation:
Groupe de Physique des Solides, Univ. Paris 7, Tour 23, 2, place Jussieu, 75251 Paris Cédex 05, France

Abstract

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Absorption spectra of some gaseous PAHs, either pure species or natural mixtures, have been obtained in the VUV-visible region and compared to the interstellar extinction curve.

The assumption that free PAHs are ubiquitous in the ISM cannot be rejected by incompatibility between the interstellar extinction curve and the absorption spectra of such molecules. PAHs absorb in the FUV rise and may give an important contribution to the bump at 2200 Å. We have derived that about 15% of the cosmic carbon is involved in these molecules.

Type
Basic Studies
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 21 - 22
Copyright
Copyright © Kluwer 1992 

References

REFERENCES

Désert, F.-X., Boulanger, F., Puget, J.L. (1990), A.& A. 237, 215–236 Google Scholar