Characterizing the High-Energy Activity of Blazars Possibly Correlated with Observed Astrophysical Neutrinos
July 24, 2019
Since IceCube’s announcement of TXS 0506+056 as a candidate for astrophysical neutrino emission, there has been a strong interest in the multi-messenger study of blazars to characterize their potential for high-energy neutrino emission. Identifying their most active periods with Fermi-LAT data and correlating the high-energy γ-ray luminosity and flare duration of these sources with potential hadronic scenarios can be a useful way to approach this problem.
In this study, we build a sample of blazars in spatial coincidence with IceCube astrophysical muonic neutrinos (med. error <= 1.3 deg), and look at their long-term γ-ray light curves to identify long-duration flares. The level of high-energy activity of the sources is quantified by calculating their γ-ray duty cycles. For the sources with relevant flares, we assume a lepto-hadronic model to obtain neutrino light-curves with different time binnings, and compare with the discovery potential of IceCube, obtaining the minimum flare duration for detecting very high-energy neutrinos from these blazars.
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