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Optical Flash of GRB 990123: Constraints on the Physical Parameters of the Reverse Shock 被引量:2

Optical Flash of GRB 990123: Constraints on the Physical Parameters of the Reverse Shock
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摘要 The optical flash accompanying GRB 990123 is believed to be powered by the reverse shock of a thin shell. With the best-fit physical parameters for GRB 990123 and the assumption that the parameters in the optical flash are the same as in the afterglow, we show that: 1) the shell is thick rather than thin, and we have provided the light curve for the thick shell case which coincides with the observation; 2) the theoretical peak flux of the optical flash accounts for only 3×10-4 of the observed. In order to remove this discrepancy, the physical parameters, the electron energy and magnetic ratios, εe and εB, should be 0.61 and 0.39, which are very different from their values for the late afterglow. The optical flash accompanying GRB 990123 is believed to be powered by the reverse shock of a thin shell. With the best-fit physical parameters for GRB 990123 and the assumption that the parameters in the optical flash are the same as in the afterglow, we show that: 1) the shell is thick rather than thin, and we have provided the light curve for the thick shell case which coincides with the observation; 2) the theoretical peak flux of the optical flash accounts for only 3×10-4 of the observed. In order to remove this discrepancy, the physical parameters, the electron energy and magnetic ratios, εe and εB, should be 0.61 and 0.39, which are very different from their values for the late afterglow.
出处 《Chinese Journal of Astronomy and Astrophysics》 CSCD 北大核心 2002年第5期449-453,共5页 中国天文和天体物理学报(英文版)
基金 the National Natural Science Foundationof China, the National 973 project (NKBRSF G19990754) the Special Funds for Major State Basic Research Projects the Foundation for the Author of National Excellent Doctoral Dissertation of P. R. China (Project No
关键词 gamma rays: bursts - gamma rays: theory gamma rays: bursts - gamma rays: theory
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