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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7893
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dc.contributor.authorDas, Saikat-
dc.contributor.authorRazzaque, Soebur-
dc.contributor.authorGupta, Nayantara-
dc.date.accessioned2022-02-15T05:14:02Z-
dc.date.available2022-02-15T05:14:02Z-
dc.date.issued2022-02-04-
dc.identifier.citationAstronomy & Astrophysics, 2022, Vol.658, Article No. L6en_US
dc.identifier.issn0004-6361-
dc.identifier.issn1432-0746 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/7893-
dc.descriptionOpen Accessen_US
dc.description.abstractContext. Blazars constitute the vast majority of extragalactic γ-ray sources. They can also contribute a sizable fraction of the diffuse astrophysical neutrinos detected by IceCube. In the past few years, the real-time alert system of IceCube has led to the multiwavelength follow-up of very high-energy neutrino events of plausible astrophysical origin. Spatial and temporal coincidences of a number of these neutrino events with γ-ray blazars provide a unique opportunity to decipher cosmic-ray interactions in the relativistic jets. Aims. The aim of this work is to test if the γ-ray blazars associated with the IceCube neutrino events are also sources of ultra-high-energy cosmic rays (UHECRs; E > 1018 eV). Methods. Assuming that blazars accelerate UHECRs, we calculate the “guaranteed” contribution to the line-of-sight cosmogenic γ-ray and neutrino fluxes from four blazars associated with IceCube neutrino events. We compare these fluxes with the sensitivities of the upcoming γ-ray imaging telescopes, such as the CTA, and with the planned neutrino detectors, such as IceCube-Gen2. Results. We find that detection of the cosmogenic neutrino fluxes from the blazars TXS 0506+056, PKS 1502+106, and GB6 J1040+0617 would require UHECR luminosity ≳10 times the inferred neutrino luminosity from the associated IceCube events, with the maximum UHECR proton energy Ep, max ≈ 1020 eV. Cosmogenic γ-ray emission from blazars TXS 0506+056, 3HSP J095507.9 +355101, and GB6 J1040+0617 can be detected by the CTA if the UHECR luminosity is ≳10 times the neutrino luminosity inferred from the associated IceCube events and for Ep, max ≳ 1019 eV. Conclusions. Detection of cosmogenic neutrino and/or γ-ray flux(es) from blazars associated with IceCube neutrinos may lead to the first direct signature(s) of UHECR sources. Given their relatively low redshifts and hence total energetics, TXS 0506+056 and 3HSP J095507.9+355101 should be the prime targets for upcoming large neutrino and γ-ray telescopes.en_US
dc.language.isoenen_US
dc.publisherEDP Sciencesen_US
dc.relation.urihttps://ui.adsabs.harvard.edu/abs/2022A%26A...658L...6D/abstracten_US
dc.relation.urihttps://arxiv.org/abs/2108.12120en_US
dc.relation.urihttps://doi.org/10.1051/0004-6361/202142123en_US
dc.rights2022 ESOen_US
dc.subjectastroparticle physicsen_US
dc.subjectgalaxies: activeen_US
dc.subjectgamma rays: generalen_US
dc.subjectneutrinosen_US
dc.titleCosmogenic gamma-ray and neutrino fluxes from blazars associated with IceCube eventsen_US
dc.typeArticleen_US
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