The Galactic NH - AV Relation and its Application to Historical Galactic SNRs
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.
- Publication:
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arXiv e-prints
- Pub Date:
- June 2013
- DOI:
- 10.48550/arXiv.1306.6506
- arXiv:
- arXiv:1306.6506
- Bibcode:
- 2013arXiv1306.6506T
- Keywords:
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- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication in NARIT Conference Series (NCS), 2 pages, 2 tables