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Title: SWIFT/BAT DETECTION OF HARD X-RAYS FROM TYCHO'S SUPERNOVA REMNANT: EVIDENCE FOR TITANIUM-44

We report Swift/Burst Alert Telescope 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 (>10σ) 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.
Authors:
; ; ; ;  [1] ; ; ;  [2] ;  [3]
  1. NASA, Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  2. INAF—IASF Palermo, Via Ugo La Malfa, I-90146 Palermo (Italy)
  3. Department of Physics and Astronomy, Clemson University, Clemson, SC 29631-0978 (United States)
Publication Date:
OSTI Identifier:
22364879
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 797; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXIES; GAMMA RADIATION; HARD X RADIATION; KEV RANGE; NUCLEOSYNTHESIS; PHOTON EMISSION; SUPERNOVA REMNANTS; TELESCOPES; TITANIUM 44; TYPE I SUPERNOVAE