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2001ApJ...547..995G - Astrophys. J., 547, 995-1009 (2001/February-1)
Balmer-dominated spectra of nonradiative shocks in the Cygnus Loop, RCW 86, and Tycho supernova remnants.
GHAVAMIAN P., RAYMOND J., SMITH R.C. and HARTIGAN P.
Abstract (from CDS):
A new numerical shock code computes the broad and narrow Balmer line emission from nonradiative shocks in partially neutral gas. The Balmer line fluxes are sensitive to Lyman line trapping and the degree of electron-proton temperature equilibration. The code calculates the density, temperature, and size of the postshock ionization layer and uses a Monte Carlo simulation to compute narrow Balmer line enhancement from Lyman line trapping. The initial fraction of the shock energy allocated to the electrons and protons (the equilibration) is a free parameter. Our models show that variations in electron-proton temperature equilibration and Lyman line trapping can reproduce the observed range of broad-to-narrow ratios. The results give 80%-100% equilibration in nonradiative portions of the northeast Cygnus Loop (vS∼300 km.s–1), 40%-50% equilibration in nonradiative portions of RCW 86 (vS∼600 km.s–1), and ≲20% equilibration in Tycho (vS∼2000 km.s–1). Our results suggest an inverse correlation between magnetosonic Mach number and equilibration in the observed remnants.
Abstract Copyright: ∼
Journal keyword(s): Radiative Transfer - Shock Waves - ISM: Supernova Remnants
Nomenclature: Table 2: [KV78] aN (Nos g1-g2) added.
CDS comments: Table 1: Cygnus P7 not identified.
Simbad objects: 17
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