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X-ray emission lines in the early afterglows of gamma-ray bursts |
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| Authors: | D I Kosenko S I Blinnikov K A Postnov P Lundqvist E I Sorokina |
| Institution: | (1) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia;(2) Institute for Theoretical and Experimental Physics, ul. Bol’shaya Cheremushkinskaya 25, Moscow, 117259, Russia;(3) Stockholm Observatory, Albanova, Stockholm, Sweden |
| Abstract: | We computed the thermal time-dependent X-ray spectrum of a hot plasma in the vicinity of a gamma-ray burst (GRB). An allowance for time-dependent processes in a hot rarefied plasma is shown to strongly affect the observed spectrum. These computations can give an alternative explanation for the observed X-ray emission lines in the early afterglows of GRBs (e.g., GRB 011211). Our technique allows the GRB collimation angle and the environment clumpiness parameters to be independently constrained. |
| Keywords: | gamma-ray bursts X-ray lines |
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