Interstellar and intergalactic magnesium and sodium absorption toward SN 1993J

David V. Bowen*, Katherine C. Roth, J. Chris Blades, David M. Meyer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

We present echelle-resolution (FWHM ∼ 5 km s-1) HST observations of Mg II, Mg I, and ground-based observations of Na I absorption toward SN 1993J which exploded in M81. We detect individual absorption components spanning a total velocity range of -163 < υ < +225 km s-1. The components are grouped into three subcomplexes, representing absorption from the disk of M81, from our own Galactic disk and halo, and from intergalactic gas which is probably the tidal debris of interactions between M81 and M82. We use the Mg I/Na I ratios to estimate the temperature of the absorbing gas; many of the components have high ratios, indicative of T > 7000 K, and so originate in the warm, diffuse ionized medium of our own Galaxy, of M81, and of the disrupted gas.

Original languageEnglish (US)
Pages (from-to)L71-L74
JournalAstrophysical Journal
Volume420
Issue number2 PART 2
DOIs
StatePublished - Jan 10 1994

Keywords

  • Galaxies: ISM
  • Galaxy: halo
  • Intergalactic medium

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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