Magnetic lensing of extremely high energy cosmic rays in a galactic wind

We show that in the model of Galactic magnetic wind recently proposed to explain the extremely high energy (EHE) cosmic rays so far observed as originating from a single source (M87 in the Virgo cluster), the magnetic field strongly magnifies the fluxes and produces multiple images of the source. Th...

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Detalles Bibliográficos
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_n10PARTB_p1_Harari
http://hdl.handle.net/20.500.12110/paper_10298479_v4_n10PARTB_p1_Harari
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_10298479_v4_n10PARTB_p1_Harari
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spelling paper:paper_10298479_v4_n10PARTB_p1_Harari2023-06-08T16:00:24Z Magnetic lensing of extremely high energy cosmic rays in a galactic wind Harari, Diego Darío Roulet, Esteban High Energy Cosmic Rays Related Astrophysics (Neutron Stars, Supernovae etc.) We show that in the model of Galactic magnetic wind recently proposed to explain the extremely high energy (EHE) cosmic rays so far observed as originating from a single source (M87 in the Virgo cluster), the magnetic field strongly magnifies the fluxes and produces multiple images of the source. The apparent position on Earth of the principal image moves, for decreasing energies, towards the galactic south. It is typically amplified by an order of magnitude at E/Z ∼ 2 × 1020 eV, but becomes strongly demagnified below 1020 eV. At energies below E/Z ∼ 1.3 × 1020 eV, all events in the northern galactic hemisphere are due to secondary images, which have huge amplifications (> 102). This model would imply strong asymmetries between the north and south galactic hemispheres, such as a (latitude dependent) upper cut-off value below 2 × 1020 eV for CR protons arriving to the south and lower fluxes in the south than in the north above 1020 eV. The large resulting magnifications reduce the power requirements on the source, but the model needs a significant tunning between the direction to the source and the symmetry axis of the wind. If more modest magnetic field strengths were assumed, a scenario in which the observed EHE events are heavier nuclei whose flux is strongly lensed becomes also plausible and would predict that a transition from a light composition to a heavier one could take place at the highest energies. 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_n10PARTB_p1_Harari http://hdl.handle.net/20.500.12110/paper_10298479_v4_n10PARTB_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
Magnetic lensing of extremely high energy cosmic rays in a galactic wind
topic_facet High Energy Cosmic Rays
Related Astrophysics (Neutron Stars, Supernovae etc.)
description We show that in the model of Galactic magnetic wind recently proposed to explain the extremely high energy (EHE) cosmic rays so far observed as originating from a single source (M87 in the Virgo cluster), the magnetic field strongly magnifies the fluxes and produces multiple images of the source. The apparent position on Earth of the principal image moves, for decreasing energies, towards the galactic south. It is typically amplified by an order of magnitude at E/Z ∼ 2 × 1020 eV, but becomes strongly demagnified below 1020 eV. At energies below E/Z ∼ 1.3 × 1020 eV, all events in the northern galactic hemisphere are due to secondary images, which have huge amplifications (> 102). This model would imply strong asymmetries between the north and south galactic hemispheres, such as a (latitude dependent) upper cut-off value below 2 × 1020 eV for CR protons arriving to the south and lower fluxes in the south than in the north above 1020 eV. The large resulting magnifications reduce the power requirements on the source, but the model needs a significant tunning between the direction to the source and the symmetry axis of the wind. If more modest magnetic field strengths were assumed, a scenario in which the observed EHE events are heavier nuclei whose flux is strongly lensed becomes also plausible and would predict that a transition from a light composition to a heavier one could take place at the highest energies.
author Harari, Diego Darío
Roulet, Esteban
author_facet Harari, Diego Darío
Roulet, Esteban
author_sort Harari, Diego Darío
title Magnetic lensing of extremely high energy cosmic rays in a galactic wind
title_short Magnetic lensing of extremely high energy cosmic rays in a galactic wind
title_full Magnetic lensing of extremely high energy cosmic rays in a galactic wind
title_fullStr Magnetic lensing of extremely high energy cosmic rays in a galactic wind
title_full_unstemmed Magnetic lensing of extremely high energy cosmic rays in a galactic wind
title_sort magnetic lensing of extremely high energy cosmic rays in a galactic wind
publishDate 2000
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n10PARTB_p1_Harari
http://hdl.handle.net/20.500.12110/paper_10298479_v4_n10PARTB_p1_Harari
work_keys_str_mv AT hararidiegodario magneticlensingofextremelyhighenergycosmicraysinagalacticwind
AT rouletesteban magneticlensingofextremelyhighenergycosmicraysinagalacticwind
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