Oral Presentation

Cosmic-ray Feedback in Galaxies: Fermi Bubbles and Odd Radio Circles

Author(s): Hsiang-Yi Karen Yang (NTHU), Po-Hsun Tseng (NTU), Hsi-Yu Schive (NTU), Tzihong Chiueh (NTU), Ellis Owen (Osaka), Yen-Hsing Lin (NTHU)

Presenter: Hsiang-Yi Karen Yang (National Tsing Hua University)

Relativistic jets from active galactic nuclei (AGNs) are vital drivers of massive galaxy properties, and cosmic rays (CRs) have shown to have significant impacts on the properties of galaxies and the circumgalactic medium. To achieve self-consistent numerical simulations, it's crucial to model CR propagation, spectral evolution, and emission mechanisms. Our 3D CR-magnetohydrodynamic simulations reveal that past activity of Sgr A* can explain the Fermi and eRosita bubbles in the Milky Way. We investigate the formation of symmetric bubbles through AGN jet interactions with the dense Galactic disk. Additionally, we explore the possibility of detecting Fermi bubble analogs in nearby galaxies using both hadronic and leptonic scenarios. When observed head-on, AGN jet-inflated bubbles offer a promising explanation for recently discovered odd radio circles (ORCs). These works advance our understanding of the roles of CRs in AGN feedback and their influence on various astrophysical phenomena within our cosmic neighborhood.