Evidence that Ultra-High-Energy Gamma Rays are a Universal Feature Near Powerful Pulsars. (arXiv:2101.07895v2 [astro-ph.HE] UPDATED)

Evidence that Ultra-High-Energy Gamma Rays are a Universal Feature Near Powerful Pulsars. (arXiv:2101.07895v2 [astro-ph.HE] UPDATED)
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The highest-energy known gamma-ray sources are all located within 0.5 degrees
of extremely powerful pulsars. This raises the question of whether
ultra-high-energy (UHE; $>$ 56 TeV) gamma-ray emission is a universal feature
expected near pulsars with a high spin-down power. Using four years of data
from the High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, we present
a joint-likelihood analysis of ten extremely powerful pulsars to search for UHE
gamma-ray emission correlated with these locations. We report a significant
detection ($>$ 3$sigma$), indicating that UHE gamma-ray emission is a generic
feature of powerful pulsars. We discuss the emission mechanisms of the gamma
rays and the implications of this result. The individual environment that each
pulsar is found in appears to play a role in the amount of emission.

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