The extinction law in high redshift galaxies

Details The extinction law in high redshift galaxies The extinction law in high redshift galaxies

2004-01-26

arxiv.org/abs/astro-ph/0401548v1

Astrophys.J. 605 (2004) 614-619

Astronomy and Astrophysics

Astrophysics

15 pages, 3 figures. ApJ in press

Scientific paper

10.1086/382500

We estimate the dust extinction laws in two intermediate redshift galaxies. The dust in the lens galaxy of LBQS1009-0252, which has an estimated lens redshift of zl~0.88, appears to be similar to that of the SMC with no significant feature at 2175 A. Only if the lens galaxy is at a redshift of zl~0.3, completely inconsistent with the galaxy colors, luminosity or location on the fundamental plane, can the data be fit with a normal Galactic extinction curve. The dust in the zl=0.68 lens galaxy for B0218+357, whose reddened image lies behind a molecular cloud, requires a very flat ultraviolet extinction curve with (formally) R(V)=12 +- 2. Both lens systems seem to have unusual extinction curves by Galactic standards.

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