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# EPS-HEP2021 conference

Jul 26 – 30, 2021
Zoom
Europe/Berlin timezone

## Mass composition modelling at sources of ultra-high energy cosmic rays

Jul 27, 2021, 10:05 AM
15m
Zoom

#### Zoom

Parallel session talk Astroparticle and Gravitational Waves

### Speaker

Jose Bazo (Pontificia Universidad Católica del Perú)

### Description

Extragalactic sources are thought to be the origin of the highest energy cosmic rays detected at Earth. In this work, we explore energy-dependent mass compositions of these sources taking a subset of the VCV catalog for distances shorter than z=0.6. We use a power-law spectrum with an exponential cutoff to model individual sources above 10$^{18}$ eV. To be more realistic we use the individual distance and flux weight of the sources, while sharing other properties as the index, Z-dependent rigidity cut and nuclei fraction. We propagate the different nuclei using CRPropa and search for the best stable parameters that fit the features of the spectrum measured by the Pierre Auger Observatory. We show the mass composition at the sources for A = 1, 1 < A ≤ 4, 4 < A ≤ 22, 22 < A ≤ 38 and A > 38.

First author Jose Bazo jbazo@pucp.edu.pe HEP-PUCP

### Primary authors

Mr Jose Olivares-Schneider (Pontificia Universidad Catolica del Peru) Mr Jaime Höfken-Zink (Pontificia Universidad Catolica del Peru) Jose Bazo (Pontificia Universidad Católica del Perú)