Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-29
Astrophys.J. 567 (2002) 454
Astronomy and Astrophysics
Astrophysics
submitted to ApJ, 29-Oct-2001; in original form 30-Jun-01
Scientific paper
10.1086/338350
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.
Bethe Hans A.
Brown Gerald E.
McLaughlin Gail C.
Wijers Ralph A. M. J.
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