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We present a comprehensive study of interstellar X-ray extinction using theextensive Chandra supernova remnant archive and use our results to refine theempirical relation between the hydrogen column density and optical extinction.In our analysis, we make use of the large, uniform data sample to assessvarious systematic uncertainties in the measurement of the interstellar X-rayabsorption. Specifically, we address systematic uncertainties that originatefrom (i) the emission models used to fit supernova remnant spectra, (ii) thespatial variations within individual remnants, (iii) the physical conditions ofthe remnant such as composition, temperature, and non-equilibrium regions, and(iv) the model used for the absorption of X-rays in the interstellar medium.Using a Bayesian framework to quantify these systematic uncertainties, andcombining the resulting hydrogen column density measurements with themeasurements of optical extinction toward the same remnants, we find theempirical relation NH = (2.87+/-0.12) x 10^21 AV cm^(-2), which issignificantly higher than the previous measurements.

Probing X-ray Absorption and Optical Extinction in the Interstellar Medium Using Chandra Observations of Supernova Remnants