Signatures of galactic magnetic lensing upon ultra high energy cosmic rays

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We analyse several implications of lensing by the regular component of the galactic magnetic field upon the observed properties of ultra high energy cosmic rays. Magnetic fields deflect cosmic ray trajectories, causing flux (de)magnification, formation of multiple images of a single source, and time...

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Autores principales: Harari, Diego Darío, Roulet, Esteban
Publicado: 2000
Materias:
High Energy Cosmic Rays
Related Astrophysics (Neutron Stars
Supernovae etc.)
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari
http://hdl.handle.net/20.500.12110/paper_10298479_v4_n2_p1_Harari
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_10298479_v4_n2_p1_Harari2023-06-08T16:00:24Z Signatures of galactic magnetic lensing upon ultra high energy cosmic rays Harari, Diego Darío Roulet, Esteban High Energy Cosmic Rays Related Astrophysics (Neutron Stars Supernovae etc.) We analyse several implications of lensing by the regular component of the galactic magnetic field upon the observed properties of ultra high energy cosmic rays. Magnetic fields deflect cosmic ray trajectories, causing flux (de)magnification, formation of multiple images of a single source, and time delays. We derive the energy dependence of these effects near the caustics at which the flux amplification of a point source diverges. We show that the large magnification of images around caustics leads to an amplification bias, which can make them dominate the flux in some energy ranges. We argue that clustering in the arrival directions of UHECRs of comparable energy may be due to magnetic lensing around caustics. We show that magnetic lensing can also significantly alter the observed composition of cosmic rays at the highest energies. We also show that the time delay between events from a single image may monotonically decrease with decreasing energy in the neighborhood of a caustic, opposite to its behaviour in normal regions. Lensing effects in the magnetic field model considered are significant for cosmic rays with ratio between energy and electric charge E/Z between 1018 and 5 1019 eV approximately. Similar effects may also occur for higher E/Z values if the galactic magnetic field is stronger or more extended than what is assumed here, or in the magnetic field of source galaxies, or even in intergalactic fields. Fil:Harari, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Roulet, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari http://hdl.handle.net/20.500.12110/paper_10298479_v4_n2_p1_Harari
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic High Energy Cosmic Rays
Related Astrophysics (Neutron Stars
Supernovae etc.)
spellingShingle High Energy Cosmic Rays
Related Astrophysics (Neutron Stars
Supernovae etc.)
Harari, Diego Darío
Roulet, Esteban
Signatures of galactic magnetic lensing upon ultra high energy cosmic rays
topic_facet High Energy Cosmic Rays
Related Astrophysics (Neutron Stars
Supernovae etc.)
description We analyse several implications of lensing by the regular component of the galactic magnetic field upon the observed properties of ultra high energy cosmic rays. Magnetic fields deflect cosmic ray trajectories, causing flux (de)magnification, formation of multiple images of a single source, and time delays. We derive the energy dependence of these effects near the caustics at which the flux amplification of a point source diverges. We show that the large magnification of images around caustics leads to an amplification bias, which can make them dominate the flux in some energy ranges. We argue that clustering in the arrival directions of UHECRs of comparable energy may be due to magnetic lensing around caustics. We show that magnetic lensing can also significantly alter the observed composition of cosmic rays at the highest energies. We also show that the time delay between events from a single image may monotonically decrease with decreasing energy in the neighborhood of a caustic, opposite to its behaviour in normal regions. Lensing effects in the magnetic field model considered are significant for cosmic rays with ratio between energy and electric charge E/Z between 1018 and 5 1019 eV approximately. Similar effects may also occur for higher E/Z values if the galactic magnetic field is stronger or more extended than what is assumed here, or in the magnetic field of source galaxies, or even in intergalactic fields.
author Harari, Diego Darío
Roulet, Esteban
author_facet Harari, Diego Darío
Roulet, Esteban
author_sort Harari, Diego Darío
title Signatures of galactic magnetic lensing upon ultra high energy cosmic rays
title_short Signatures of galactic magnetic lensing upon ultra high energy cosmic rays
title_full Signatures of galactic magnetic lensing upon ultra high energy cosmic rays
title_fullStr Signatures of galactic magnetic lensing upon ultra high energy cosmic rays
title_full_unstemmed Signatures of galactic magnetic lensing upon ultra high energy cosmic rays
title_sort signatures of galactic magnetic lensing upon ultra high energy cosmic rays
publishDate 2000
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari
http://hdl.handle.net/20.500.12110/paper_10298479_v4_n2_p1_Harari
work_keys_str_mv AT hararidiegodario signaturesofgalacticmagneticlensinguponultrahighenergycosmicrays
AT rouletesteban signaturesofgalacticmagneticlensinguponultrahighenergycosmicrays
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