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Gamma-ray flare and absorption in Crab Nebula: Lovely TeV-PeV astrophysics

We spectrally fit the GeV gamma-ray flares recently-observed in the Crab Nebula by considering a small blob Lorentz-boosted towards us. We point out that the corresponding inverse-Compton flare at TeV--PeV region is more enhanced than synchrotron by a Lorentz factor square \sim Γ^2, which is already excluding Γ\gtrsim 200 and will be detected by future TeV - PeV observatories, CTA, Tibet AS + MD and LHAASO for Γ\gtrsim 30. We also show that PeV photons emitted from the Crab Nebula are absorbed by Cosmic Microwave Background radiation through electron-positron pair creation.

preprint2012arXivOpen access
Kazunori KohriYutaka OhiraKunihito Ioka
astro-ph.COhep-phastro-ph.HE
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Kazunori KohriYutaka OhiraKunihito Ioka

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