Implications of multiwavelength spectrum on cosmic-ray acceleration in blazar TXS 0506+056

Abstract

MAGIC collaboration has recently analyzed data from a long-term multiwavelength campaign of the $\gamma$-ray blazar TXS 0506+056. In December 2018, it was flaring in the very-high-energy (VHE; $E>100$ GeV) $\gamma$-ray band, but no simultaneous neutrino event was detected. We model the observed spectral energy distribution (SED), using a one-zone leptohadronic emission. We estimate the neutrino flux through the restriction from observed X-ray flux on the secondary radiation due to hadronic cascade, initiated by protons with energy $E_p\lesssim 0.1$ EeV. We assume ultrahigh-energy cosmic rays (UHECRs; $E\gtrsim 0.1$ EeV), with the same slope and normalization as the low-energy spectrum, are accelerated in the jet but escape efficiently. We propagate the UHE protons in a random, turbulent extragalactic magnetic field (EGMF). The leptonic emission from the jet dominates the GeV range, whereas the cascade emission from CR interactions in the jet contributes substantially to the X-ray and VHE range. The line-of-sight cosmogenic $\gamma$ rays from UHECRs produce a hardening in the VHE spectrum. Our model prediction for neutrinos from the jet is consistent with the 7.5-year flux limit by IceCube and shows no variability during the MAGIC campaign. Therefore, we infer that the correlation between GeV-TeV $\gamma$-rays and neutrino flare is minimal. The luminosity in CRs limits the cosmogenic $\gamma$-ray flux, which, in turn, bounds the RMS value of the EGMF to $\gtrsim 10^{-5}$ nG. The cosmogenic neutrino flux is lower than the IceCube-Gen2 detection potential for 10 yrs of observation. VHE $\gamma$-ray variability should arise from increased activity inside the jet; thus, detecting steady flux at multi-TeV energies may indicate UHECR acceleration. Upcoming $\gamma$-ray imaging telescopes such as the CTA will be able to constrain the cosmogenic $\gamma$-ray component in the SED of TXS 0506+056.

arXiv comment7 pages, 3 figures, Accepted for publication in A&A

References in corpus (41)

• Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
• Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
• Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert
• Leptonic and Hadronic Modeling of Fermi-Detected Blazars
• IceCube-Gen2: The Window to the Extreme Universe
• Semi-analytic modeling of the EBL and consequences for extragalactic gamma-ray spectra
• Monte-Carlo simulations of photohadronic processes in astrophysics
• CRPropa 3 - a Public Astrophysical Simulation Framework for Propagating Extraterrestrial Ultra-High Energy Particles
• A Multimessenger Picture of the Flaring Blazar TXS 0506+056: implications for High-Energy Neutrino Emission and Cosmic Ray Acceleration
• The blazar sequence: a new perspective
• The blazar TXS 0506+056 associated with a high-energy neutrino: insights into extragalactic jets and cosmic ray acceleration
• Modelling the coincident observation of a high-energy neutrino and a bright blazar flare
• Photohadronic origin of $\gamma$-ray BL Lac emission: implications for IceCube neutrinos
• Blazar Flares as an Origin of High-Energy Cosmic Neutrinos?
• TXS 0506+056, the first cosmic neutrino source, is not a BL Lac
• Ice Cube Observed PeV Neutrinos from AGN Cores
• Leptohadronic blazar models applied to the 2014-15 flare of TXS 0506+056
• The spectrum of the Broad Line Region and the high-energy emission of powerful blazars
• Investigation of two Fermi-LAT gamma-ray blazars coincident with high-energy neutrinos detected by IceCube
• PeV neutrinos from intergalactic interactions of cosmic rays emitted by active galactic nuclei
• A hadronuclear interpretation of a high-energy neutrino event coincident with a blazar flare
• Multi-Epoch Modeling of TXS 0506+056 and Implications for Long-Term High-Energy Neutrino Emission
• Propagation of high-energy cosmic rays in extragalactic turbulent magnetic fields: resulting energy spectrum and composition
• A two-zone model for blazar emission: implications for TXS 0506+056 and the neutrino event IceCube-170922A
• Anisotropies of ultra-high energy cosmic rays diffusing from extragalactic sources
• Lepto-hadronic $\gamma$-ray and neutrino emission from the jet of TXS 0506+056
• Patterns in the multi-wavelength behavior of candidate neutrino blazars
• A Neutral Beam Model for High-Energy Neutrino Emission from the Blazar TXS 0506+056
• A search for neutrino emission from cores of Active Galactic Nuclei
• A two-zone blazar radiation model for "orphan" neutrino flares
• Describing correlated observations of neutrino and gamma ray flares from the blazar TXS 0506+056 with proton blazar model
• Production and propagation of ultra-high energy photons using CRPropa 3
• Complementarity of Stacking and Multiplet Constraints on the Blazar Contribution to the Cumulative High-Energy Neutrino Intensity
• Investigating the blazar TXS 0506+056 through sharp multi-wavelength eyes during 2017-2019
• Ultrahigh-energy cosmic ray interactions as the origin of very high energy $\gamma -$rays from BL Lacs
• Cosmogenic gamma-ray and neutrino fluxes from blazars associated with IceCube events
• The Cherenkov Telescope Array: layout, design and performance
• PeV-EeV neutrinos from gamma-ray blazars due to ultrahigh-energy cosmic-ray propagation
• Electron-positron pair plasma in TXS 0506+056 and the "neutrino flare" in 2014-2015
• Photohadronic model for the neutrino and $\gamma$-ray emission from TXS 0506+056
• Contribution of Secondary Neutrinos from Line-of-sight Cosmic Ray Interactions to the IceCube Diffuse Astrophysical Flux

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