期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 671, 期 2, 页码 L97-L100出版社
IOP PUBLISHING LTD
DOI: 10.1086/525251
关键词
dust, extinction; galaxies : clusters : general; intergalactic medium; quasars : general
We report on the detection of reddening toward z similar to 0.2 galaxy clusters. This is measured by correlating the Sloan Digital Sky Survey cluster and quasar catalogs and by comparing the photometric and spectroscopic properties of quasars behind the clusters to those in the field. We find mean E(B - V) values of a few x 10(-3) mag for sight lines passing similar to Mpc from the clusters' centers. The reddening curve is typical of dust but cannot be used to distinguish between different dust types. The radial dependence of the extinction is shallow near the cluster center suggesting that most of the detected dust lies at the outskirts of the clusters. Gravitational magnification of background z similar to 1.7 sources seen on Mpc (projected) scales around the clusters is found to be of order a few percent, in qualitative agreement with theoretical predictions. Contamination by different spectral properties of the lensed quasar population is unlikely but cannot be excluded.
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