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Detection of the 2175AA Extinction Feature at z=0.83 | | V. Motta
; E. Mediavilla
; J. A. Munoz
; E. Falco
; C. S. Kochanek
; S. Arribas
; B. Garcia-Lorenzo
; A. Oscoz
; M. Serra-Ricart
; | | Date: |
8 Apr 2002 | | Subject: | astro-ph | | Affiliation: | 1,2), E. Mediavilla , J. A. Munoz , E. Falco , C. S. Kochanek , S. Arribas (4,5), B. Garcia-Lorenzo , A. Oscoz , M. Serra-Ricart ( Instituto de Astrofisica de Canarias, Tenerife, Spain, Departamento de Astronomia, Facultad de Ciencias, Montevideo, Ur | | Abstract: | We determine the extinction curve in the z_l=0.83 lens galaxy of the gravitational lens SBS0909+532 from the wavelength dependence of the flux ratio between the lensed quasar images (z_s=1.38) from 3400 to 9200AA. It is the first measurement of an extinction curve at a cosmological distance of comparable quality to those obtained within the Galaxy. The extinction curve has a strong 2175AA feature, a noteworthy fact because it has been weak or non-existent in most estimates of extinction curves outside the Galaxy. The extinction curve is fitted well by a standard $R_V=2.1pm0.9$ Galactic extinction curve. If we assume standard Galactic extinction laws, the estimated dust redshift of $z=0.88pm0.02$ is in good agreement with the spectroscopic redshift of the lens galaxy. The widespread assumption that SMC extinction curves are more appropriate models for cosmological dust may be incorrect. | | Source: | arXiv, astro-ph/0204130 | | Services: | Forum | Review | PDF | Favorites | |
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