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Title:
Electron-Ion Equilibration in Nonradiative Shocks Associated with SN 1006
Authors:
Laming, J. Martin; Raymond, John C.; McLaughlin, Brendan M.; Blair, William P.
Publication:
Astrophysical Journal v.472, p.267 (ApJ Homepage)
Publication Date:
11/1996
Origin:
APJ
ApJ Keywords:
ATOMIC PROCESSES, ISM: SUPERNOVA REMNANTS, SHOCK WAVES, ISM: INDIVIDUAL ALPHANUMERIC: SN 1006
DOI:
10.1086/178061
Bibliographic Code:
1996ApJ...472..267L

Abstract

The ultraviolet spectrum of SN 1006 observed by the Hopkins Ultraviolet Telescope (HUT) is modeled to infer the degree of electron-ion equilibration at the nonradiative shocks in the remnant. Such an approach is possible since the spectrum has lines (He II 1640) whose excitation is dominated by electrons, and others (C IV λ1550, N V λ1240, O VI λ1036) in which protons and other ions are more important, and the intensity ratio between these is sensitive to the electron-ion temperature ratio. We find substantially less than full equilibration, marginally consistent with existing plasma simulations but rather more suggestive of even lower equilibration than these studies would predict The more stringent limits on the electron temperature resulting from this allow a more accurate determination of the distance to SN 1006. Our result is 1.8±0.3 kpc.

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