Swift/BAT detection of hard X-rays from Tycho's Supernova Remnant: Evidence for Titanium-44

E. Troja , A. Segreto , V. La Parola , D. Hartmann , W. Baumgartner , C. Markwardt , S. Barthelmy , G. Cusumano

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N. Gehrels

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classification 🌌 astro-ph.HE

keywords supernovaremnantemissionhardswifttitanium-44tychotype

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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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Swift/BAT detection of hard X-rays from Tycho's Supernova Remnant: Evidence for Titanium-44

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