XRF 050406 late-time flattening: an inverse Compton component?

Abstract

We investigate for possible evidence of inverse Compton (IC) emission in the X-ray afterglow of XRF 050406. In the framework of the standard fireball model, we show how the late-time flattening observed in the X-ray light curve between \~10^{4} s and ~10^{6} s can be explained in a synchrotron-plus-IC scenario, when the IC peak frequency crosses the X-ray band. We thus conclude that the appearance of an IC component above the synchrotron one at late times successfully accounts for these X-ray observations.

9 pages, 7 figures, 1 table, accepted for publication in A&A. Version accepted by A&A, minor changes in the title, contents and conclusions unchanged, language corrections included

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