Kavli Affiliate: Shunsaku Horiuchi
| First 5 Authors: Sean Heston, Nick Ekanger, Shunsaku Horiuchi, ,
| Summary:
We examine the detectability of $gamma$-ray emission originating from the
radioactive decays of unstable nuclei that are synthesized in relativistic
outflows launched in magnetorotational core-collapse supernovae. The observed
lines have enhanced energies due to the Lorentz boosted nuclei and can also be
seen until later times due to time dilation of the rest-frame half-lives. We
find that instruments like textit{e-ASTROGAM} and textit{INTEGRAL/SPI} are
sensitive to these boosted line emissions from hundreds of keV to tens of MeV
at a distance of 10 kpc over timescales of tens of days. For favorable viewing
angles, these decays can be detected to extragalactic distances for rapidly
spinning protomagnetar models. On the other hand, detection for off-axis jets
is challenging, even for a supernova at the Galactic Center. Measuring multiple
decay lines in addition to the integrated luminosity over $sim10$ days
postbounce would allow for the ability to distinguish between models and shed
light on central engine properties like magnetic field and spin.
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