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Evidence for the presence of dust in intervening QSO absorbers from the Sloan Digital Sky Survey

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arxiv astro-ph/0504532 v1 pith:3532OV3V submitted 2005-04-25 astro-ph

Evidence for the presence of dust in intervening QSO absorbers from the Sloan Digital Sky Survey

P. Khare , D. G. York , D. Vanden Berk , V. P. Kulkarni , A. P. S.Crotts , D. E. Welty , J. T. Lauroesch , G. T. Richards
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Y. Alsayyad A. Kumar B. Lundgren N. Shanidze J. Vanlandingha B. Baugher P. B. Hall E. B. Jenkins B. Menard S. Rao D. Turnshek & C.W. Yip
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keywords dustabsorberscurveevidenceextinctioninterveningdigitalqsos
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We find evidence for dust in the intervening QSO absorbers from the spectra of QSOs in the Sloan Digital Sky Survey Data Release 1. No evidence is found for the 2175 A feature which is present in the Milky Way dust extinction curve. The extinction curve resembles the SMC extinction curve. The observed Delta(g-i) excess for QSOs with strong absorption systems appears to be a result of the reddening due to dust in the intervening absorbers.

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