TY - JOUR
T1 - Interstellar and intergalactic magnesium and sodium absorption toward SN 1993J
AU - Bowen, David V.
AU - Roth, Katherine C.
AU - Blades, J. Chris
AU - Meyer, David M.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1994/1/10
Y1 - 1994/1/10
N2 - 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.
AB - 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.
KW - Galaxies: ISM
KW - Galaxy: halo
KW - Intergalactic medium
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U2 - 10.1086/187165
DO - 10.1086/187165
M3 - Article
AN - SCOPUS:12044254275
SN - 0004-637X
VL - 420
SP - L71-L74
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART 2
ER -