The Galactic NH - AV Relation and its Application to Historical Galactic SNRs
arXiv:1306.6506
Abstract
We refine a classic relation between the hydrogen column density (NH) and optical extinction (Av) by employing 39 Galactic Supernova Remnants (SNRs) with X-rays, optical and/or infra-red data available. We find NH = (1.69+/-0.07)*10^21 Av cm^(-2) mag^(-1) . Applying this relation to three Galactic SNRs with good historical records allows us to further constrain either their progenitor's distances or magnitudes, which is independent access to their distances.
Accepted for publication in NARIT Conference Series (NCS), 2 pages, 2 tables