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Broad and shifted iron-group emission lines in gamma-ray bursts as tests of the hypernova scenario | | G.C. McLaughlin
; R.A.M.J. Wijers
; G.E. Brown
; H.A. Bethe
; | | Date: |
29 Oct 2001 | | Journal: | Astrophys.J. 567 (2002) 454 | | Subject: | astro-ph | | Affiliation: | 1,2), R.A.M.J. Wijers , G.E. Brown , H.A. Bethe ( SUNY Stony Brook; North Carolina State Univ.; Cornell | | 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. | | Source: | arXiv, astro-ph/0110614 | | Services: | Forum | Review | PDF | Favorites | |
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