Swift/BAT detection of hard X-rays from Tycho's Supernova Remnant: Evidence for Titanium-44
Troja, E. · Segreto, A. · La Parola, V. · Hartmann, D. · Baumgartner, W. · Markwardt, C. · Barthelmy, S. · Cusumano, G. · Gehrels, N.
Original · EN
We report Swift/BAT survey observations of the Tycho's supernova remnant, performed over a period of 104 months since the mission's launch. The remnant is detected with high significance (>10 sigma) below 50 keV. We detect significant hard X-ray emission in the 60-85 keV band, above the continuum level predicted by a simple synchrotron model. The location of the observed excess is consistent with line emission from radioactive Titanium-44, so far reported only for Type II supernova explosions. We discuss the implications of these results in the context of the galactic supernova rate, and nucleosynthesis in Type Ia supernova.
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