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

Abstract

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.

5 pages, 4 figures, accepted for publication in ApJL

References in corpus (8)

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• The Cassiopeia A Supernova was of Type IIB
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Cited by in corpus (10)

• On the fate of the secondary white dwarf in double-degenerate double-detonation Type Ia supernovae
• ${}^{44}\mathrm{Ti}$ ejecta in young supernova remnants
• Spatial distribution of X-ray emitting ejecta in Tycho's SNR: indications of shocked Titanium
• Time evolution of broadband non-thermal emission from supernova remnants in different circumstellar environments
• A Nucleosynthetic Origin for the Southwestern Fe-rich Structure in Kepler's Supernova Remnant
• Presolar grains
• Using ${}^{44}$Ti Emission to Differentiate Between Thermonuclear Supernova Progenitors
• Pre-explosion helium shell flash in type Ia supernovae
• X-ray Measurements of ${}^{44}$Ti in Four Supernova Remnants
• SN1991bg-like supernovae are a compelling source of most Galactic antimatter