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journal id: "astrophysicalxjournal"
| Authors | G.C. McLaughlin, R.A.M.J. Wijers, G.E. Brown, H.A. Bethe | | Title | Broad and Shifted Iron-Group Emission Lines in Gamma-Ray Bursts as Tests of the Hypernova Scenario |
| Journal | Astrophysical Journal |
| Volume | 567 |
| Year | 2002 |
| Issue | 1 |
| Pages | 454-462 |
| ISSN | 0004637X |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Astronomical Institute Anton Pannekoek (IAP) |
| Keywords | Gamma ray bursts; Supernovae |
| 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 1 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. |
| Note | ©2002 American Astronomical Society |
| Document type | Article |
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