The relation between optical extinction and hydrogen column density in the Galaxy
Tolga GÃ ⁄ verUniversity of Arizona, Department of Astronomy, 933 N. Cherry Ave., Tucson, AZ 85721, USAFeryal ÃZelUniversity of Arizona, Department of Astronomy, 933 N. Cherry Ave., Tucson, AZ 85721, USA
2009en
ABI
Abstract
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.
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