Cherenkov telescope array extragalactic survey discovery potential and the impact of axion-like particles and secondary gamma rays

Franco, Andrea; Inoue, Yoshiyuki; Cotter, Garret

doi:10.1016/j.astropartphys.2017.03.010

Cited by 5 publications

(3 citation statements)

References 113 publications

(143 reference statements)

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“…A possible solution to this problem proposed in Ref. [16][17][18][19][20][78][79][80][81][82] is based on the natural assumption that the blazars also emit ultrahigh energy cosmic rays which contribute to the observed γ-ray flux through secondary electromagnetic cascades produced in line of sight cosmic ray interactions. The above scenario allows to avoid exponential γ-ray flux suppression with distance from the source.…”

Section: Appendix A: Consistency With Blazar Observablesmentioning

confidence: 99%

Cosmic infrared background excess from axionlike particles and implications for multimessenger observations of blazars

2019

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The first measurement of the diffuse background spectrum at 0.8-1.7 µm from the CIBER experiment has revealed a significant excess of the cosmic infrared background (CIB) radiation compared to the theoretically expected spectrum. We revisit the hypothesis that decays of axionlike particle (ALP) can explain this excess, extending previous analyses to the case of a warm relic population. We show that such a scenario is not excluded by anisotropy measurements nor by stellar cooling arguments. Moreover, we find that the increased extragalactic background light (EBL) does not contradict observations of blazar spectra. Furthermore, the increased EBL attenuates the diffuse TeV gamma-ray flux and alleviates the tension between the detected neutrino and gamma ray fluxes.

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Section: Appendix A: Consistency With Blazar Observablesmentioning

confidence: 99%

Cosmic infrared background excess from axionlike particles and implications for multimessenger observations of blazars

2019

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“…Protons with energies above 10 17 eV can interact with extragalactic background light (EBL) photons and produce neutrinos in the reaction p + γ b → n + π + , followed by pion decay. There is growing evidence that such interactions are responsible for the high-energy spectra of the most distant blazars Essey et al , 2011aEssey & Kusenko 2012;Razzaque et al 2012a;Murase et al 2012;Essey & Kusenko 2014;Aharonian et al 2013;Prosekin et al 2012;Inoue et al 2014;De Franco et al 2017;Archer et al 2018;Gueta 2020;Das et al 2020;Toomey et al 2020). Neutrinos produced in the same interactions can account for the ∼PeV neutrinos observed by IceCube (Kalashev et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Contribution of Secondary Neutrinos from Line-of-sight Cosmic Ray Interactions to the IceCube Diffuse Astrophysical Flux

Kochocki,

Takhistov,

Kusenko

et al. 2020

Preprint

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In ten years of observations, the IceCube neutrino observatory has revealed a neutrino sky in tension with previous expectations for neutrino point source emissions. Astrophysical objects associated with hadronic processes might act as production sites for neutrinos, observed as point sources at Earth. Instead, a nearly isotropic flux of astrophysical neutrinos is observed up to PeV energies, prompting a reassessment of the assumed transport and production physics. This work applies a new physical explanation for neutrino production from populations of active galactic nuclei (AGN) and starburst galaxies to three years of public IceCube point source data. Specifically, cosmic rays (CRs) produced at such sources might interact with extragalactic background light and gas along the line of sight, generating a secondary neutrino flux. This model is tested alongside a number of typical flux weighting schemes, in all cases the all-sky flux contribution being constrained to percent levels of the reported IceCube diffuse astrophysical flux.

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“…In this paper we use the ctools release version 1.6. The software has been extensively used on simulated CTA data (Hütten et al 2016;Petropoulou et al 2017;Acero et al 2017;De Franco et al 2017;Burtovoi et al 2017;Balázs et al 2017;Patricelli et al 2018;Hütten & Maier 2018;Romano et al 2018;Landoni et al 2019;Tavecchio et al 2019;Yang & Razzaque 2019; CTA Consortium 2019) but so far had not yet been validated on existing IACT data. Moreover, no systematic comparison between the classical and multi-component likelihood fitting methods was performed on an existing IACT data set.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the H.E.S.S. public data release with ctools

Knödlseder

Tibaldo

Tiziani

et al. 2019

A&A

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The ctools open-source software package was developed for the scientific analysis of astronomical data from Imaging Air Cherenkov Telescopes (IACTs), such as H.E.S.S., VERITAS, MAGIC, and the future Cherenkov Telescope Array (CTA). To date, the software has been mainly tested using simulated CTA data; however, upon the public release of a small set of H.E.S.S. observations of the Crab nebula, MSH 15-52, RX J1713.7-3946, and PKS 2155-304 validation using real data is now possible. We analysed the data of the H.E.S.S. public data release using ctools version 1.6 and compared our results to those published by the H.E.S.S. Collaboration for the respective sources. We developed a parametric background model that satisfactorily describes the expected background rate as a function of reconstructed energy and direction for each observation. We used that model, and tested all analysis methods that are supported by ctools, including novel unbinned and joint or stacked binned analyses of the measured event energies and reconstructed directions, and classical On-Off analysis methods that are comparable to those used by the H.E.S.S. Collaboration. For all analysis methods, we found a good agreement between the ctools results and the H.E.S.S. Collaboration publications considering that they are not always directly comparable due to differences in the datatsets and event processing software. We also performed a joint analysis of H.E.S.S. and Fermi-LAT data of the Crab nebula, illustrating the multi-wavelength capacity of ctools. The joint Crab nebula spectrum is compatible with published literature values within the systematic uncertainties. We conclude that the ctools software is mature for the analysis of data from existing IACTs, as well as from the upcoming CTA.

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Cherenkov telescope array extragalactic survey discovery potential and the impact of axion-like particles and secondary gamma rays

Cited by 5 publications

References 113 publications

Cosmic infrared background excess from axionlike particles and implications for multimessenger observations of blazars

Cosmic infrared background excess from axionlike particles and implications for multimessenger observations of blazars

Contribution of Secondary Neutrinos from Line-of-sight Cosmic Ray Interactions to the IceCube Diffuse Astrophysical Flux

Analysis of the H.E.S.S. public data release with ctools

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