Fig. 1 from A Chandra Minisurvey of X‐Ray

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A Chandra Minisurvey of X‐Ray–weak Quasars

Authors: G. Risaliti, M. Elvis, R. Gilli, and M. Salvati

Risaliti et al. 2003 The Astrophysical Journal Letters 587 L9.

Provider: AAS Journals

Caption: Fig. 1.

Optical–to–X‐ray ratio as inferred from ROSAT observations for the color‐selected PG quasars (shaded histogram) and the sample of R01. ﹩I_{\mathrm{OX}\,}﹩ is a logarithmic measure of the ratio between optical (B band) and soft X‐ray flux.

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