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• W2061177402 abstract "Context. Fast-moving knots (FMK) in the Galactic supernova remnant Cassiopeia A consist mainly of metals and allow us to study element production in supernovae and to investigate shock physics in great detail.Aims. We discuss and suggest observations of a previously unexplored class of spectral lines, the metal recombination lines in optical and near-infrared bands, emitted by the cold ionized and cooling plasma in fast-moving knots.Methods. By tracing ion radiative and dielectronic recombination, collisional l -redistribution and radiative cascade processes, we compute resulting oxygen, silicon and sulphur recombination line emissivities. This allows us to determine the oxygen recombination line fluxes, based on a fast-moving knot model that predicts the existence of highly-ionized ions from moderate to very low plasma temperatures.Results. The calculations predict oxygen ion recombination line fluxes detectable with modern optical telescopes in the wavelength range from 0.5 to 3 μ m. Recombination line flux ratios to collisionally-excited lines will allow us to probe in detail the process of rapid cloud cooling after the passage of a shock front, to test high abundances of O4+ , O5+ and O6+  ions at low temperatures and measure them, to test existing theoretical models of FMK and to build more precise ones." @default.
• W2061177402 created "2016-06-24" @default.
• W2061177402 creator A5072763091 @default.
• W2061177402 creator A5089957429 @default.
• W2061177402 date "2008-04-22" @default.
• W2061177402 modified "2023-09-27" @default.
• W2061177402 title "Optical and near-infrared recombination lines of oxygen ions from Cassiopeia A knots" @default.
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• W2061177402 doi "https://doi.org/10.1051/0004-6361:200809579" @default.
• W2061177402 hasPublicationYear "2008" @default.
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