Speaker
Description
Relativistic jets from black hole X-ray binaries (BHXBs) and active galactic nuclei (AGN) are powerful accelerators of cosmic rays (CRs), reaching energies up to the PeV scale and shaping the multiwavelength (MW) and multimessenger sky. Recent observations – including TeV detections of BHXBs and refined AGN spectra – motivate unified modeling frameworks capable of capturing jet physics across scales while probing potential interactions with light dark matter (DM). In this work, we extend the BHJet model to consistently describe BHXB and AGN jets, incorporating CR interactions with their environments and with sub-GeV DM candidates. We analyse both quiescent and active source states and test different statistical approaches, including nested sampling, to robustly explore parameter degeneracies. Applying the model to Markarian 421 we achieve simultaneous fitting of jet dynamics and DM–electron interactions. This yields competitive constraints on DM-induced CR cooling, strengthening existing limits by up to an order of magnitude depending on DM mass. Our results demonstrate that joint MW modeling of jets is a powerful avenue for identifying astrophysical PeVatrons and constraining physics beyond the Standard Model.
