The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy

By T. Guver, F. Özel. 2009

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A linear relation between the hydrogen column density ( N H ) and optical extinction ( A V ) 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 N H (cm − 2 ) = (2.21 ± 0.09) × 10 21 A V (mag). We compare our result with the previous studies and assess any systematic uncertainties that may affect these results.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/208fbe0554863c3060ddfec17548aebb2c2c3d00