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

Abstract

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.

6 pages, 5 figures, to appear in Mon. Not. Roy. Astron. Soc

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• The surprising Crab pulsar and its nebula: A review
• Variable gamma-ray emission from the Crab Nebula: short flares and long "waves"
• H.E.S.S. Observations of the Crab during its March 2013 GeV Gamma-Ray Flare
• Jitter radiation model of the Crab gamma ray flares
• A systematic study of $\gamma$-ray flares from the Crab Nebula with Fermi-LAT: I. flare detection
• Search for Sources of High Energy Neutrons with Four Years of Data from the IceTop Detector
• High energy emission from transients
• On the fraction of particles involved in magneto-centrifugally generated ultra-high energy electrons in the Crab pulsar
• First constraints on axion-like particles from Galactic sub-PeV gamma rays