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Recent ultrahigh energy gamma-ray observations by the HAWC up to 100 TeV andLHAASO observatories up to 1.4 PeV energies from the direction of Fermi-LAT4FGL source 4FGL J2028.6+4110e (Cygnus Cocoon), are indicative of a hadronicorigin over a leptonic process for their creation. The IceCube NeutrinoObservatory has reported IceCube-201120A, a neutrino event coming from the samedirection, suggesting that the Cygnus Cocoon may correspond to one of the mostplausible sources of high-energy cosmic rays. The apparent relationship of theneutrino event with the observed ultra high energy gamma-rays from CygnusCocoon is investigated in this work to study if it can be explainedconsistently in hadronic interactions of accelerated cosmic rays with ambientmatter. Our findings reveal that leptonic mechanisms, together with purehadronic mechanisms, make a considerable contribution to the understanding ofthe total electromagnetic spectrum as well as the observed neutrino event. Theestimate of expected muon neutrino events from the Cygnus cocoon agrees withthe one muon neutrino event detected so far in IceCube multi-year observations.Thus, our results are indicative of the potential of the Cygnus Cocoon to be agalactic cosmic ray source capable of accelerating at least up to PeV energies.

Probing the origin of cosmic rays in Cygnus Cocoon using ultrahigh-energy gamma-ray and neutrino observations