Inverse comptonization vs. thermal synchrotron

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X-Ray Sources, X-Ray Bursts, Radiation Mechanisms, Polarization

Scientific paper

There are currently two radiation mechanisms being considered for gamma-ray bursts: thermal synchrotron and inverse comptonization. They are mutually exclusive because thermal synchrotron requires a magnetic field of ~1012 Gauss, whereas inverse comptonization cannot produce a monotonic spectrum if the field is larger than 1011 and is too inefficient relative to thermal synchrotron unless the field is less than 109 Gauss. Neither mechanism can explain completely the observed characteristics of gamma-ray bursts. However, we conclude that thermal synchrotron is more consistent with the observations if the sources are ~40 kpc away, whereas inverse comptonization is more consistent if they are ~300 pc away. Unfortunately, the source distance still is not known and, thus, the radiation mechanism still is uncertain.

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