The ${\hat{I}}^3$-ray-emitting blazar B3 1239+376 at $z$ = 3.82 identified in a multi-wavelength context

Wei Zhang, Neng-Hui Liao, Hao-Yi Huang +6

Among thousands of extragalactic ${\hat{I}}^3$-ray emitters, only a handful of distant ($z>$ 3) sources are detected. Yet, they are crucial probes shedding light on the cosmic evolution of…