| Texto completo | |
| Autor(es): |
de Oliveira, Caina
;
de Souza, Vitor
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 545, n. 3, p. 8-pg., 2026-01-01. |
| Resumo | |
The origin of ultra-high-energy cosmic rays (UHECRs) remains a puzzle more than 50 yr after their discovery. Yet, the well-established excess of events toward the radio galaxy Centaurus A (Cen A) raises the possibility that it is the first identifiable UHECR source. Although Cen A has been considered as a UHECR source, its present jet activity seems unable to explain the most energetic events. Recently, the lobes of radio galaxies have been proposed as potential reservoirs of UHECRs, from which particles accelerated in previous episodes of higher activity slowly escape. In this work, we investigated whether the past activity episodes of Cen A could be related to the UHECR excess observed in the Centaurus region. By modelling the UHECR propagation in the Giant Lobes of Cen A, we tested the reservoir hypothesis and its connection with the activity history of Cen A. By analysing the energies of the events and the overall mass composition of UHECRs, we find that activity within the last similar to 30 Myr is required to explain the excess. This period aligns closely with the time-scale where the transition regions and the Giant Lobes must be energized, as revealed by radio and gamma ray observations. (AU) | |
| Processo FAPESP: | 20/15453-4 - Mecanismos de produção de astropartículas ultra energéticas |
| Beneficiário: | Cainã de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 25/03325-5 - Fontes poderosas de partículas cósmicas II |
| Beneficiário: | Cainã de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 21/01089-1 - Cherenkov Telescope Array: construção e primeiras descobertas |
| Beneficiário: | Luiz Vitor de Souza Filho |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |
| Processo FAPESP: | 19/10151-2 - Estudo de raios cósmicos de energias ultra-altas com o AugerPrime |
| Beneficiário: | Carola Dobrigkeit Chinellato |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |