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Swift, Chandra and XMM have found a weak but nearly constant X-ray componentfrom 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 standardtidal disruption theories. We suggest that this X-ray afterglow component mayresult from Thomson scattering between the primary X-rays and its surroundingplasma, i.e. the Compton echo effect. Similar phenomena has also been observedfrom molecular clouds in our Galactic Center, which were caused by the pastactivity of Srg A*. If this interpretation of Swift J1644+57 afterglow iscorrect, this is the first Compton Echo effect observed in the cosmologicaldistances.

X-Ray afterglow of SWIFT J1644+57: a Compton echo?