The relation between optical extinction and hydrogen column density in the Galaxy

Tolga Güver, Feryal Özel

Research output: Contribution to journalArticle

313 Scopus citations

Abstract

A linear relation between the hydrogen column density (NH) and optical extinction (AV) 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 andor reddening measurements have been performed and find NH (cm -2) = (2.21 ± 0.09) × 1021 AV (mag). We compare our result with the previous studies and assess any systematic uncertainties that may affect these results.

Original languageEnglish (US)
Pages (from-to)2050-2053
Number of pages4
JournalMonthly Notices of the Royal Astronomical Society
Volume400
Issue number4
DOIs
StatePublished - Dec 2009

Keywords

  • Dust, extinction
  • Supernova remnants
  • X-rays: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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