Schedule Sep 21, 2006
Extinction Curves of Lensing Galaxies
Ms. Árdís Elíasdóttir, DARK & KITP

Dust extinction causes light from distant sources to be dimmed on its way to the observer. In cosmological studies, such as SN Ia studies, it is of great importance that the effects of dust extinction be correctly accounted for. However, although dust properties, and hence extinction, are expected to vary with redshift, not very much is known about the extinction properties of high redshift galaxies. This is because the methods traditionally used to study extinction curves are only applicable for the most nearby galaxies. Studying gravitationally lensed quasars is an emerging method of studying the dust extinction of high redshift galaxies. I will present an ESO VLT study of 10 such lensing galaxies, with redshifts up to 1. The 10 systems display varying amount and type of extinction, with the doubly imaged quasar B1152+199 showing the greatest extinction with A (V)=2.4 and R_V=2.1 for a Galactic type extinction law.

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