Contribution of Pahs to the Interstellar Extinction Curve

  title={Contribution of Pahs to the Interstellar Extinction Curve},
  author={Christine Joblin and A. L{\'e}ger and Preston Martin and Daniel Defourneau},
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 A. We have derived that about 15% of the cosmic… CONTINUE READING