July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Determination of source spectra of ultrahigh energy cosmic rays

Aug 4, 2015, 4:00 PM
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 182
Poster contribution CR-TH Poster 3 CR


Svetlana Rogovaia (IZMIRAN)


The energy spectra and composition of ultra-high energy cosmic rays are changing in a course of propagation in the expanding Universe filled with background radiation. We use a numerical code for solution of inverse problem for cosmic-ray transport equations that enables the determination of average source spectra of different nuclei from the cosmic ray spectra observed at the Earth. The source spectrum is calculated without ad hoc assumptions about its' shape. The injection spectra of a few groups of nuclei in extragalactic sources are found. The effects of cosmological source evolution and the finite distance to the nearest source are studied. The data from the Auger experiment and the combined data from the Telescope Array + HiRes experiments are used to illustrate the method.
Registration number following "ICRC2015-I/" 0195
Collaboration -- not specified --

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