X-ray Lines in Gamma-ray Bursts and Cerenkov Line Mechanism |
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| Authors: | Wei Wang |
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| Institution: | (1) National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China;(2) Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong |
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| Abstract: | X-ray emission and absorption features are of great importance in our understanding the nature and environment of gamma-ray
bursts (GRBs). So far, iron emission lines have been detected in at least four GRB afterglows. In this paper, the observational
properties and physical constraints on materials surrounding GRB sources are reviewed, and several classes of theoretical
models are also discussed. We will specially concentrate on the Cerenkov line mechanism, in which the broad iron lines are
expected, and a small mass of Fe is required to produce the large line luminosity. In addition, our interpretation can favor
the recent jet unified model for different classes of gamma-ray bursts with a standard energy reservoir. |
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| Keywords: | gamma-rays: bursts X-rays lines radiation mechanism: nonthermal |
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