HAWC observations of Mrk 421 reveal a 13±3 TeV cutoff in high states at 3.8σ significance, indicating intrinsic origin and providing EBL intensity upper limits.
A., Ansoldi, S., Antonelli, L
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Constraining the Photon Intensity of Extragalactic Background Light with the HAWC Observatory for the Blazar Mrk 421
HAWC observations of Mrk 421 reveal a 13±3 TeV cutoff in high states at 3.8σ significance, indicating intrinsic origin and providing EBL intensity upper limits.