X-RAY AFTERGLOW OF SWIFT J1644+57: A COMPTON ECHO?
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 the Thomson scattering between the primary X-rays and its surrounding plasma, i.e., a Compton echo effect. Similar phenomena have 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.
- Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong (China)
- Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China)
- Institute of Astronomy, Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan (China)
- Publication Date:
- OSTI Identifier:
- Resource Type:
- Journal Article
- Resource Relation:
- Journal Name: Astrophysical Journal Letters; Journal Volume: 816; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
- Country of Publication:
- United States
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; CAPTURE; CLOUDS; COSMOLOGY; DISTANCE; MILKY WAY; PLASMA; THOMSON SCATTERING; X RADIATION