Blazar Flares as an Origin of High-energy Cosmic Neutrinos?

Kohta Murase, Foteini Oikonomou, Maria Petropoulou

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We consider implications of high-energy neutrino emission from blazar flares, including the recent event IceCube-170922A and the 2014-2015 neutrino flare that could originate from TXS 0506+056. First, we discuss their contribution to the diffuse neutrino intensity taking into account various observational constraints. Blazars are likely to be subdominant in the diffuse neutrino intensity at sub-PeV energies, and we show that blazar flares like those of TXS 0506+056 could make ≲1%-10% of the total neutrino intensity. We also argue that the neutrino output of blazars can be dominated by the flares in the standard leptonic scenario for their γ-ray emission, and energetic flares may still be detected with a rate of . Second, we consider multi-messenger constraints on the source modeling. We show that luminous neutrino flares should be accompanied by luminous broadband cascade emission, emerging also in X-rays and γ-rays. This implies that not only γ-ray telescopes like Fermi but also X-ray sky monitors such as Swift and MAXI are critical to test the canonical picture based on the single-zone modeling. We also suggest a two-zone model that can naturally satisfy the X-ray constraints while explaining the flaring neutrinos via either photomeson or hadronuclear processes.

Original languageEnglish (US)
Article number124
JournalAstrophysical Journal
Volume865
Issue number2
DOIs
StatePublished - Oct 1 2018

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flares
neutrinos
energy
rays
modeling
blazars
energetics
x rays
sky
monitors
emerging
cascades
telescopes
broadband
output
flaring
rate
test

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Murase, Kohta ; Oikonomou, Foteini ; Petropoulou, Maria. / Blazar Flares as an Origin of High-energy Cosmic Neutrinos?. In: Astrophysical Journal. 2018 ; Vol. 865, No. 2.
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Blazar Flares as an Origin of High-energy Cosmic Neutrinos? / Murase, Kohta; Oikonomou, Foteini; Petropoulou, Maria.

In: Astrophysical Journal, Vol. 865, No. 2, 124, 01.10.2018.

Research output: Contribution to journalArticle

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