Artículo
Abstract:
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.
Registro:
| Documento: | Artículo |
| Título: | Signatures of galactic magnetic lensing upon ultra high energy cosmic rays |
| Autor: | Harari, D.; Mollerach, S.; Roulet, E. |
| Filiación: | Departamento de Física, FCEyN, Univ. Buenos Aires Cd. Univ. - P., 1428, Buenos Aires, Argentina Departamento de Física, Universidad Nacional de La Plata, CC67, 1900, La Plata, Argentina |
| Palabras clave: | High Energy Cosmic Rays; Related Astrophysics (Neutron Stars; Supernovae etc.) |
| Año: | 2000 |
| Volumen: | 4 |
| Número: | 2 |
| Página de inicio: | 1 |
| Página de fin: | 17 |
| Título revista: | Journal of High Energy Physics |
| Título revista abreviado: | J. High Energy Phys. |
| ISSN: | 10298479 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari |
Referencias:
- Bhattacharjee, P., Sigl, G., Origin and Propagation of Extremely High Energy Cosmic Rays, , astro-ph/9811011
- Harari, D., Mollerach, S., Roulet, E., The toes of the ultra high energy cosmic ray spectrum (1999) J. High Energy Phys., 8, p. 022. , astro-ph/9906309
- Miralda-Escudé, J., Waxman, E., Signatures of the origin of high-energy cosmic rays in cosmological gamma ray bursts (1996) Astrophys. J., 462, pp. L59. , astro-ph/9601012
- Images of bursting sources of high-energy cosmic rays, 1. Effects of magnetic fields (1996) Astrophys. J., 472, pp. L89. , astro-ph/9607059
- Stanev, T., Ultra-high energy cosmic rays and the large-scale structure of the galactic magnetic field (1997) Astrophys. J., 479, pp. L290. , astro-ph/9607086
- Medina Tanco, G., De Gouveia Dal Pino, E., Horvath, J., Deflection of ultra-high energy cosmic rays by the galactic magnetic field: From the sources to the detector (1998) Astrophys. J., 492, pp. L200. , astro-ph/9707041
- Schneider, P., Ehlers, J., Falco, E.E., (1992) Gravitational Lenses, , Springer-Verlag, Berlin
- Chang, K., Refsdal, S., Flux variations of QSO 0957+561 A, B and the image splitting by stars near the light path (1979) Nature, 282, p. 561
- Blandford, R., Narayan, R., Fermat's principle, caustics, and the classification of gravitational lens images (1986) Astrophys. J., 310, p. 568
- Schneider, P., Weiss, A., The gravitational lens equation near cusps (1992) Astron. Astrophys., 260, p. 1
- Turner, E.L., Ostriker, J.P., Gott III, J.R., The statistics of gravitational lenses: The distributions of image angular separations and lens redshifts (1984) Astrophys. J., 284, p. 1
- Uchihori, Y., Cluster Analysis of Extremely High Energy Cosmic Rays in the Northern Sky, , astro-ph/9908193
- Ahn, E.-J., Medina-Tanco, G., Biermann, P.L., Stanev, T., The Origin of the Highest Energy Cosmic Rays: Do All Roads Lead Back to Virgo?, , astro-ph/9911123
- http://www.auger.org/auger.html; http://bragg.physics.adelaide.edu.au/astrophysics/HiRes.html
Citas:
---------- APA ----------
Harari, D., Mollerach, S. & Roulet, E. (2000) . Signatures of galactic magnetic lensing upon ultra high energy cosmic rays. Journal of High Energy Physics, 4(2), 1-17.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari [ ]
---------- CHICAGO ----------
Harari, D., Mollerach, S., Roulet, E. "Signatures of galactic magnetic lensing upon ultra high energy cosmic rays" . Journal of High Energy Physics 4, no. 2 (2000) : 1-17.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari [ ]
---------- MLA ----------
Harari, D., Mollerach, S., Roulet, E. "Signatures of galactic magnetic lensing upon ultra high energy cosmic rays" . Journal of High Energy Physics, vol. 4, no. 2, 2000, pp. 1-17.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari [ ]
---------- VANCOUVER ----------
Harari, D., Mollerach, S., Roulet, E. Signatures of galactic magnetic lensing upon ultra high energy cosmic rays. J. High Energy Phys. 2000;4(2):1-17.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10298479_v4_n2_p1_Harari [ ]
