Abstract
Motivated by the observation of a > 290 TeV muon neutrino by IceCube, coincident with a ~6 month-long γ-ray flare of the blazar TXS 0506+056, and an archival search which revealed 13 ± 5 further, lower-energy neutrinos in the direction of the source in 2014-2015 we discuss the likely contribution of blazars to the diffuse high-energy neutrino intensity, the implications for neutrino emission from TXS 0506+056 based on multi-wavelength observations of the source, and a multi-zone model that allows for sufficient neutrino emission so as to reconcile the multi-wavelength cascade constraints with the neutrino emission seen by IceCube in the direction of TXS 0506+056.
Highlights
The IceCube Collaboration recently reported the observation of a > 290 TeV muon neutrino, IceCube-170922A, coincident with a ∼6 month-long γ-ray flare of the blazar TXS 0506+056 [1], at redshift z ≈ 0.3365 [2]
These events were not accompanied by a γ-ray flare. Such an accumulation of events is inconsistent with arising from a background fluctuation at the 3.5σ level. Motivated by these observations in [5], we considered the implications of the possible neutrino-blazar flare association
Even though for the sources that we studied highly-significant flaring states are achieved for a small fraction of time, during which a non-dominant part of the observed γ-ray emission is released this may not be the case for the neutrino emission for at least two reasons, which we discuss below in turn
Summary
The IceCube Collaboration recently reported the observation of a > 290 TeV muon neutrino, IceCube-170922A, coincident with a ∼6 month-long γ-ray flare of the blazar TXS 0506+056 [1], at redshift z ≈ 0.3365 [2]. An archival search revealed 13 ± 5 further, lower-energy neutrinos in the direction of TXS 0506+056 during a 6-month period in 2014-2015 [4]. These events were not accompanied by a γ-ray flare. Such an accumulation of events is inconsistent with arising from a background fluctuation at the 3.5σ level. Motivated by these observations in [5], we considered the implications of the possible neutrino-blazar flare association.
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