Sixteenth Marcel Grossmann Meeting

Could the flaring activities observed in Mrk 421 and 501 be explained in a lepto-hadronic scenario with two-zone emission?

7 Jul 2021, 08:50

20m

Talk in the parallel session Multiwavelength and Multi-Messenger Observations of Active Galactic Nuclei Multiwavelength and Multi-Messenger Observations of Active Galactic Nuclei

Speaker

Edilberto Aguilar-Ruiz (Instituto de Astronomia, UNAM)

Description

The BL Lacs Mrk 421 and Mrk 501 show fast variability in the TeV-band flares, indicating a compact emission region. The lack of correlation between X-ray and TeV flux hints at more than one emission zone. Both sources have shown temporary extreme behavior. In this work, we used a lepto-hadronic model with two-zone emission to explain the spectral energy distribution during the very high-energy flare activity. The first zone can explain the fast variability in the TeV band via photo-pion interactions where the seed photons come from a pair-plasma launched since the nuclear region. The second zone follows the standard one-zone SSC model with the main contribution in X-rays and sub-TeV energies. In addition, the first zone could emit neutrinos in TeV-energy, which can be testable by the IceCube’s observations.