Neutrinos as a diagnostic of cosmic ray Galactic/extra-galactic transition
| Popis: | Motivated by a recent change in viewing the onset of the extra-galactic component in the cosmic ray spectrum, we have fitted the observed data down to $10^{8.6}$ GeV and have obtained the corresponding power emissivity. This transition energy is well below the threshold for resonant $p\gamma$ absorption on the cosmic microwave background, and thus source evolution is an essential ingredient in the fitting procedure. Two-parameter fits in the spectral and redshift evolution indices show that a standard Fermi $E_i^{-2}$ source spectrum is excluded at larger than 95% confidence level (CL). Armed with the primordial emissivity, we follow Waxman and Bahcall to derive the associated neutrino flux on the basis of optically thin sources. For $pp$ interactions as the generating mechanism, the neutrino flux exceeds the AMANDA-B10 90%CL upper limits. In the case of $p\gamma$ dominance, the flux is marginally consistent with AMANDA-B10 data. In the new scenario the source neutrino flux dominates over the cosmogenic flux at all energies. Thus, should data from AMANDA-II prove consistent with the model, we show that IceCube can measure the characteristic power law of the neutrino spectrum, and thus provide a window on the source dynamics. Comment: To be published in Phys. Rev. D |
|---|---|
| Jazyk: | English |
| DOI: | 10.1103/PhysRevD.72.023001 |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::521bd054ecd6b7d895d02da155f813be http://arxiv.org/abs/astro-ph/0503229 |
| Rights: | OPEN |
| Přírůstkové číslo: | edsair.doi.dedup.....521bd054ecd6b7d895d02da155f813be |
| Autor: | Markus Ahlers, Haim Goldberg, Francis Halzen, Luis A. Anchordoqui, Thomas J. Weiler, Andreas Ringwald |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
interaction [photon p]
Nuclear and High Energy Physics Particle physics cosmic radiation [neutrino] Astrophysics::High Energy Astrophysical Phenomena particle source [cosmic radiation] Cosmic microwave background Cosmic background radiation FOS: Physical sciences interaction [p p] Cosmic ray cosmic background radiation Astrophysics 01 natural sciences 7. Clean energy High Energy Physics - Phenomenology (hep-ph) interpretation of experiments [numerical calculations] 0103 physical sciences ddc:530 Absorption (logic) 010303 astronomy & astrophysics leptonic decay [pi+] Physics 010308 nuclear & particles physics transition [energy] Astrophysics (astro-ph) photoproduction [pi+] photon p --> n pi+ Redshift High Energy Physics - Phenomenology flux [cosmic radiation] pi+ --> muon+ neutrino/mu Neutrino Energy (signal processing) Fermi Gamma-ray Space Telescope |
| Zdroj: | Physical review / D 72(2), 023001 (2005). doi:10.1103/PhysRevD.72.023001 |
| DOI: | 10.1103/PhysRevD.72.023001 |
| Popis: | Motivated by a recent change in viewing the onset of the extra-galactic component in the cosmic ray spectrum, we have fitted the observed data down to $10^{8.6}$ GeV and have obtained the corresponding power emissivity. This transition energy is well below the threshold for resonant $p\gamma$ absorption on the cosmic microwave background, and thus source evolution is an essential ingredient in the fitting procedure. Two-parameter fits in the spectral and redshift evolution indices show that a standard Fermi $E_i^{-2}$ source spectrum is excluded at larger than 95% confidence level (CL). Armed with the primordial emissivity, we follow Waxman and Bahcall to derive the associated neutrino flux on the basis of optically thin sources. For $pp$ interactions as the generating mechanism, the neutrino flux exceeds the AMANDA-B10 90%CL upper limits. In the case of $p\gamma$ dominance, the flux is marginally consistent with AMANDA-B10 data. In the new scenario the source neutrino flux dominates over the cosmogenic flux at all energies. Thus, should data from AMANDA-II prove consistent with the model, we show that IceCube can measure the characteristic power law of the neutrino spectrum, and thus provide a window on the source dynamics. Comment: To be published in Phys. Rev. D |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|