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

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

2009-03-11

arxiv.org/abs/0903.2057v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

to be published in MNRAS

Scientific paper

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 \pm0.09) x10^{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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