Cosmogenic gamma-ray and neutrino fluxes from blazars associated with IceCube events

Das, Saikat; Razzaque, S.; Gupta, Nayantara

doi:10.1051/0004-6361/202142123

Cited by 7 publications

(5 citation statements)

References 42 publications

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“…The required luminosity in UHE protons can also be translated into a resulting flux of neutrinos at EeV energies. The cosmogenic neutrino flux predicted here, from constraints on γ-ray flux, is found to be lower than that in our earlier study (Das et al 2022). Thus, detection of cosmogenic neutrinos from TXS 0506+056 seems unlikely with the next generation upgrade of IceCube, leaving ground-based γ-ray detectors such as CTA to test UHECR signature in the SED of blazars.…”

Section: Discussioncontrasting

confidence: 71%

“…Thus, it is possible to produce protons of energy higher than 0.17 EeV in the same blob for the magnetic field and the length scale considered. The pγ opacity in the jet is higher than 1e-3 for protons with energy > 6 × 10 17 eV (see, e.g., Das et al 2022). The jet is opaque to photons beyond ∼ 1 TeV; therefore, if UHE protons interact inside the jet, additional gamma rays from the π 0 , π ± cascade contribute at lower energies, violating the X-ray data.…”

Section: Cosmogenic γ-Rays From Uhecrsmentioning

confidence: 99%

“…They can escape the jet and interact with cosmic background photons. In an earlier work, the neutrino flux originating in extragalactic propagation of UHECRs from TXS 0506+056, and a few other blazars was analyzed (Das et al 2022). We assumed a correlation between the cosmic-ray luminosity and IceCube-detected neutrino luminosity inside the jet to scale the cosmogenic fluxes.…”

Section: Introductionmentioning

confidence: 99%

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

Das

Gupta

Razzaque

2022

A&A

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Context. The MAGIC collaboration has recently analyzed data from a long-term multiwavelength campaign of the γ-ray blazar TXS 0506+056. In December 2018 it was flaring in the very high-energy (VHE; E > 100 GeV) γ-ray band, but no simultaneous neutrino event was detected. Aims. We modeled the observed spectral energy distribution (SED) using a one-zone leptohadronic emission. Methods. We estimated the neutrino flux through the restriction from the observed X-ray flux on the secondary radiation due to the hadronic cascade, initiated by protons with energy E p 0.1 EeV. We assumed that ultra-high-energy cosmic rays (UHECRs; E 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).Results. 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 γ-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 γ-rays and neutrino flare is minimal. The luminosity in CRs limits the cosmogenic γ-ray flux, which in turn bounds the RMS value of the EGMF to 10 −5 nG. The cosmogenic neutrino flux is lower than the IceCube-Gen2 detection potential for 10 yr of observation. Conclusions. Very high-energy γ-ray variability should arise from increased activity inside the jet; thus, detecting steady flux at multi-TeV energies may indicate UHECR acceleration. Upcoming γ-ray imaging telescopes, such as the CTA, will be able to constrain the cosmogenic γ-ray component in the SED of TXS 0506+056.

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Section: Discussioncontrasting

confidence: 71%

Section: Cosmogenic γ-Rays From Uhecrsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Das

Gupta

Razzaque

2022

A&A

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“…It should be noted, that the required kinetic power in protons exceeds the Eddington luminosity of the source. We have checked that for protons to interact dominantly with the synchrotron photons, E p,max must be 10 17 eV, and hence ΓE p,max corresponds to ultrahigh energies, which will lead to signatures of the extragalactic cascade at multi-TeV energies (Das et al 2022b), which is not detected for this source. Hence, for more reasonable results, PKS 0735+178 can be considered a "masquerading BL Lac" similar to TXS 0506+056, with hidden emission lines (Padovani et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Dissecting the broadband emission from γ-ray blazar PKS 0735+178 in search of neutrinos

Prince¹,

S²,

Gupta³

et al. 2023

Preprint

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Context. The origin of the diffuse flux of TeV-PeV astrophysical neutrinos is still unknown. The γ-ray blazar PKS 0735+178, located within 90% error region expanded by a factor of 1.3 of the neutrino event IC-211208A, was found to be flaring in multi-frequency wavebands at the time of detection by IceCube Observatory. Aims. In addition to leptonic synchrotron (SYN) and synchrotron self-Compton (SSC) emission, we invoke photohadronic (pγ) interactions inside the jet to model the spectral energy distribution (SED) and neutrino emission. Methods. We analyze the long-term γ-ray and X-ray data to generate the broadband SED. The temporal light curve indicates that the source was in a high state in optical UV, γ-ray, and X-ray range during the neutrino detection epoch.Results. In the one-zone lepto-hadronic model, the SSC photons do not provide enough seed photons for pγ interactions to explain the neutrino event. However, including an external photon field yields a neutrino event rate of 0.2 in 100 days, for the IceCube detector, for physically motivated values of the magnetic field, an external photon field peaking at optical wavelength, and other jet parameters without exceeding the Eddington luminosity. Conclusions. The radiation from secondary electrons at X-ray energies severely constrains the neutrino flux to a lower value than found in previous studies. In contrast, the pion decay cascade flux at GeV energies is subdominant at the high-energy peak of the SED, suggesting a higher correlation of neutrinos with X-ray emission is plausible.

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“…However, the intrinsic hard VHE spectra of some AGNs imply a different physical interpretation. Several models are proposed, such as the spine-layer model (Ghisellini et al 2005;Acciari et al 2020a), the proton-synchrotron model (Aharonian 2000;Mücke & Protheroe 2001;Mücke et al 2003;Cerruti et al 2015;Xue et al 2023), and the ultra-high-energy cosmicray propagation model (Essey et al 2011;Prosekin et al 2012;Das et al 2020Das et al , 2022. The reported minute-scale variability at VHE band also implies a multizone origin of the multiwavelength emission of the jet (e.g., Begelman et al 2008;Liu et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Broadband Multiwavelength Study of LHAASO-detected Active Galactic Nuclei

Wang,

Xue,

Xiong

et al. 2024

ApJS

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Recently, the Large High Altitude Air Shower Observatory (LHAASO) collaboration presented the first catalog of γ-ray sources using 508 days of LHAASO data, from 2021 March to 2022 September. This catalog contains four blazars and a possible LINER-type active galactic nucleus (AGN) counterpart. In this work, we establish averaged multiwavelength spectral energy distributions (SEDs) by combining data from the Fermi-Large Area Telescope, Swift, Zwicky Transient Facility, and Wide-field Infrared Survey Explorer (WISE) covering the same period as the LHAASO detection. In general, these five AGNs are found in low states at all wavelengths. To study the multiwavelength properties of these AGNs, several jet emission models, including the one-zone leptonic model, the one-zone leptonic and hadronuclear (pp) model, the one-zone proton-synchrotron model, and the spine-layer model, are applied to reproduce their averaged SEDs. We find that the one-zone leptonic model can reproduce most of the SEDs, except for the high-energy tail of the LHAASO spectra of Mrk 421 and Mrk 501. To improve the fitting, emission from pp interactions is favored in the framework of a one-zone model. The spine-layer model, which can be treated as a multizone scenario, can also provide good spectral fits. The influence of different extragalactic background light models on fitting a LHAASO energy spectrum is also discussed.

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Cosmogenic gamma-ray and neutrino fluxes from blazars associated with IceCube events

Cited by 7 publications

References 42 publications

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

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

Dissecting the broadband emission from γ-ray blazar PKS 0735+178 in search of neutrinos

Broadband Multiwavelength Study of LHAASO-detected Active Galactic Nuclei

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