Ballistic and diffusive components in the dynamic spectra of ultrahigh energy cosmic rays from nearby transient sources
| Autor: | R. Gnatyk, Bohdan Hnatyk, V. I. Zhdanov, Yu. L. Kolesnyk, Yu. I. Fedorov, B. A. Shakhov |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Active galactic nucleus 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Centaurus A Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Cosmic ray Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Spectral line Space and Planetary Science Millisecond pulsar 0103 physical sciences Intergalactic travel Ultra-high-energy cosmic ray 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy cluster |
| Zdroj: | Kinematics and Physics of Celestial Bodies. 32:105-119 |
| ISSN: | 1934-8401 0884-5913 |
| DOI: | 10.3103/s088459131603003x |
| Popis: | Ultrahigh energy cosmic rays (UHECRs, E > 1018 eV) from extragalactic sources deviate in the galactic and intergalactic magnetic fields, which explains the diffusive character of their propagation, the isotropization of their total flux, and the absence of UHECR clusters associated with individual sources. Extremely high energy cosmic rays (E > 1019.7 eV) are scattered mainly in localized magnetized structures, such as galaxy clusters, filaments, etc., with a mean free path of tens of megaparsecs; therefore, in the case of nearby transient sources, a substantial contribution to the observed flux is expected from unscattered and weakly scattered particles, which may be a decisive factor in the identification of these sources. We propose a method for calculating the time evolution of the UHECR energy spectra based on analytical solutions of the transport equation with the explicit determination of the contributions from scattered and unscattered particles. As examples, we consider the cases of transient activity of the nearest active galactic nucleus, Centaurus A, and the acceleration of UHECRs by a young millisecond pulsar. |
| Databáze: | OpenAIRE |
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