Constraining the baryon loading factor of AGN jets: implication from the gamma-ray emission of the Coma cluster
arXiv:2201.09479 · doi:10.3847/1538-4357/ac4ae9
Abstract
High-energy cosmic rays (CRs) can be accelerated in the relativistic jets of Active Galactic Nuclei (AGNs) powered by supermassive black holes. The baryon loading efficiency onto relativistic CR baryons from the accreting black holes is poorly constrained by observations so far. In this paper, we suggest that the -ray emission of galaxy clusters can be used to study the baryon loading factor of AGN jets, since CRs injected by AGN jets are completely confined in the galaxy clusters and sufficiently interact with intra-cluster medium via hadronic process, producing diffuse -rays. We study the propagation of CRs in the galaxy clusters and calculate the radial distribution of the gamma-rays in the galaxy cluster with different injection rates from AGNs. By comparison with the -ray flux and upper limits of the Coma cluster measured by -LAT and VERITAS, we find the upper limit of the average baryon loading factor {(defined as the efficiency with which the gravitational energy is converted into relativistic particles)} to be . The upper limit is much lower than that required to account for diffuse neutrino flux in the conventional blazar models.
arXiv comment12 pages, 9 figures. Accepted for Publication in ApJ
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