An ISO survey of PAH features in Ultraluminous Infrared Galaxies

Details An ISO survey of PAH features in Ultraluminous Infrared Galaxies An ISO survey of PAH features in Ultraluminous Infrared Galaxies

1998-08-28

arxiv.org/abs/astro-ph/9808330v1

Astronomy and Astrophysics

Astrophysics

4 pages, paspconf.sty, 2 eps, 1 gif figures, to appear in proceedings "Astrophysics with Infrared Surveys"

Scientific paper

We have obtained ISOPHOT-S low resolution mid-infrared spectra of a sample of 60 Ultraluminous Infrared Galaxies (ULIRGs). We use the strength of the `PAH' mid-infrared features as a discriminator between starburst and AGN activity, and to probe for evolutionary effects. We focus on the fact that observed ratios of PAH features in ULIRGs differ slightly from those in lower luminosity starbursts. We suggest that such PAH ratio changes relate to the conditions in the interstellar medium in these galaxies, and in particular to extinction.

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