Extreme HBL-like behavior of Markarian 421 and its two-zone photohadronic interpretation

Sarira Sahu, Carlos E. López Fortín, Isabel Abigail Valadez Polanco +1

Markarian 421 is the nearest high-energy peaked blazar and also is the first extragalactic source to be detected in multi-TeV $\gamma$-rays. It has been observed in multiwavelength for…