X-Ray afterglow of SWIFT J1644+57: a Compton echo?
High Energy Astrophysical Phenomena
2016-01-13 v2
Abstract
Swift, Chandra and XMM have found a weak but nearly constant X-ray component from Swift J1644+57 that appeared at ~500 days and was visible at least until ~ 1400 days after the stellar capture, which cannot be explained by standard tidal disruption theories. We suggest that this X-ray afterglow component may result from Thomson scattering between the primary X-rays and its surrounding plasma, i.e. the Compton echo effect. Similar phenomena has also been observed from molecular clouds in our Galactic Center, which were caused by the past activity of Srg A*. If this interpretation of Swift J1644+57 afterglow is correct, this is the first Compton Echo effect observed in the cosmological distances.
Keywords
Cite
@article{arxiv.1512.05037,
title = {X-Ray afterglow of SWIFT J1644+57: a Compton echo?},
author = {K. S. Cheng and D. O. Chernyshov and V. A. Dogiel and Albert K. H. Kong and C. M. Ko},
journal= {arXiv preprint arXiv:1512.05037},
year = {2016}
}
Comments
To be published in ApJL, accepted