The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
Abstract
A linear relation between the hydrogen column density (NH) and optical extinction (AV) in the Galaxy has long been observed. A number of studies found differing results in the slope of this relation. Here, we utilize the data on 22 supernova remnants that have been observed with the latest generation X-ray observatories and for which optical extinction and/or reddening measurements have been performed and find NH (cm-2) = (2.21 0.09) x1021 AV (mag). We compare our result with the previous studies and assess any systematic uncertainties that may affect these results.
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