Acceleration and Propagation of Cosmic Rays in High-Metallicity Astrophysical Environments (eBook)

This thesis addresses the feasibility of the production of ultra-high-energy cosmic rays in starburst galaxies and active galactic nuclei. These astrophysical objects were theoretically proposed as candidate sources a long time ago. Nevertheless, the interest in them has been recently renewed due to the observational data collected by the Pierre Auger Observatory and the Telescope Array. In this work, a comprehensive review of the current status of the research on cosmic rays accelerators is provided, along with a summary of the principal concepts needed to connect these relativistic particles with electromagnetic and neutrino observations in the multi-messenger era. On one hand, the hypothesis of accelerating particles with energies above 10¹8 eV in starburst superwinds is carefully revisited, taking into account the constraints imposed by the most recent electromagnetic observations. On the other hand, an alternative new model for the gamma emission of the nearby active galaxy NGC 1068 is presented. The implications of the results of these studies are discussed in terms of the contemporary observatories and prospects for future experiments are offered.

Ana Laura Müller received her Licentiate degree in Astronomy from the Universidad Nacional de La Plata (UNLP). Afterwards, she started her doctoral research focusing on the origin of ultra-high-energy cosmic rays under the supervision of Prof. Dr. Gustavo E. Romero and Prof. Dr. Dr. Johannes Blümer, as well as the advice of Dr. Markus Roth. She graduated from the Double Doctoral degree program in Astrophysics (DDAp), offered jointly by the Karlsruher Institut für Technologie (KIT) and the Universidad Nacional de San Martín (UNSAM). Currently, she is working as a postdoctoral fellow at the Institute of Physics of the Czech Academy of Sciences (CAS) in Prague on a project led by Dr. Anabella Araudo to investigate the production of cosmic rays in jets of active galactic nuclei.