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Coherent Synchrotron Radiation of Gamma-Ray Bursts

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Abstract

By now there is no doubt that the gamma-ray bursts (GRB) have a cosmological origin. This allows to regard GRB as the most powerful known energy sources, ε ∼ 1054 erg (with a total number of gamma quanta N γ ∼ 1060). A plausible mechanism of coherent synchrotron radiation (CSR) of relativistic electrons driven by a local magnetic field is studied in this paper. We consider relativistic electrons arising in the Compton scattering of a GRB in directions close to that of the ray from the source to a ground-based observer. The synchrotron pulses from Compton electrons located at different points on the line between the GRB source and the observer arrive at the observation point simultaneously. This simultaneity ensures the coherence of the detected radiation. Both molecular clouds in the host galaxy of the GRB and our own Galaxy, as well as the Earth atmosphere are assumed to be scatterers of the GRB radiation. Signals of each scatterer reach the Earth surface, and can be detected at radio wavelengths. We estimate the characteristics of this radiation. The comparison of GRB data with the corresponding information on CSR pulses offers a way to determine some global characteristics of the medium between the Earth and the GRB source.

Keywords

  • coherent synchrotron radiation
  • gamma-ray burst
  • Compton electrons
  • molecular clouds

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  • DOI: 10.1007/1-4020-3881-X_31
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References

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© 2005 Springer

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Gainullin, K., Zlobin, A. (2005). Coherent Synchrotron Radiation of Gamma-Ray Bursts. In: Cheng, K., Romero, G. (eds) Multiwavelength Approach to Unidentified Gamma-Ray Sources. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3881-X_31

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  • DOI: https://doi.org/10.1007/1-4020-3881-X_31

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  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-4020-3214-1

  • Online ISBN: 978-1-4020-3881-5

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