Where do IceCube neutrinos come from? Hints from the diffuse gamma-ray flux
| Autor: | Arman Esmaili, Antonio Capanema, Pasquale D. Serpico |
|---|---|
| Přispěvatelé: | Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Photon
Opacity scale: TeV redshift: dependence Astrophysics::High Energy Astrophysical Phenomena Population Flux FOS: Physical sciences Astrophysics 01 natural sciences GLAST neutrino: flux IceCube Galactic halo cascade: electromagnetic High Energy Physics - Phenomenology (hep-ph) galaxy: halo neutrino: spectrum 0103 physical sciences gamma ray: flux education Physics High Energy Astrophysical Phenomena (astro-ph.HE) education.field_of_study 010308 nuclear & particles physics photon Gamma ray Astronomy and Astrophysics neutrino: particle source tension Redshift 3. Good health High Energy Physics - Phenomenology [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] Neutrino Astrophysics - High Energy Astrophysical Phenomena [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | JCAP JCAP, 2021, 02, pp.037. ⟨10.1088/1475-7516/2021/02/037⟩ |
| DOI: | 10.1088/1475-7516/2021/02/037⟩ |
| Popis: | Despite the spectacular discovery of an astrophysical neutrino flux by IceCube in 2013, its origin remains a mystery. Whatever its sources, we expect the neutrino flux to be accompanied by a comparable gamma-ray flux. These photons should be degraded in energy by electromagnetic cascades and contribute to the diffuse GeV-TeV flux precisely measured by the Fermi-LAT. Population studies have also permitted to identify the main classes of contributors to this flux, which at the same time have not been associated with major neutrino sources in cross-correlation studies. These considerations allow one to set constraints on the origin and spectrum of the IceCube flux, in particular its low-energy part. We find that, even accounting for known systematic errors, the Fermi-LAT data exclude to at least 95% C.L. any extragalactic transparent source class, irrespective of its redshift evolution, if the neutrino spectrum extends to the TeV scale or below. If the neutrino spectrum has an abrupt cutoff at $\sim10$ TeV, barely compatible with current observations, the tension can be reduced, but this way out requires a significant modification to the current understanding of the origin of the diffuse extragalactic gamma-ray flux at GeV energies. In contrast, these considerations do not apply if a sizable fraction of IceCube data originates within the Galactic halo (a scenario however typically in tension with other constraints) or from a yet unidentified class of "opaque" extragalactic emitters, which do not let the high-energy gamma rays get out. Comment: 24 pages, 9 figures, v2: discussion expanded, references added, matches the version published in JCAP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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