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• W3102223311 abstract "In the hypernova/collapsar model of gamma-ray bursts, it is natural that radiation is emitted by the inner engine for some time after the burst. This has been discussed as a possible source of the X-ray line emission observed in some afterglows. We show here that the natural geometry of a hypernova --a source of radiation at the bottom of a deep funnel-- has very significant consequences for the shape and central energy of the observed emission lines: the lines acquire a very broad scattering wing on the low-energy side and a characteristic second peak one Compton wavelength away from the initial energy, due to the once- and twice-scattered photons. We suggest that this explains the large width of the observed lines. Furthermore, the downscattering lowers the central line energy (by up to 1 keV in the source rest frame, before the lines become unrecognizable), so that the observed line energies can become consistent with originating from cobalt and nickel, as expected in few-day-old supernova ejecta." @default.
• W3102223311 created "2020-11-23" @default.
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• W3102223311 date "2002-03-01" @default.
• W3102223311 modified "2023-09-24" @default.
• W3102223311 title "Broad and Shifted Iron‐Group Emission Lines in Gamma‐Ray Bursts as Tests of the Hypernova Scenario" @default.
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• W3102223311 doi "https://doi.org/10.1086/338350" @default.
• W3102223311 hasPublicationYear "2002" @default.
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