Properties and Possible Physical Origins of ${\hat{I}}^3$-ray Emission in Extreme Synchrotron Blazars

Ji-Shun Lian, Jia-Xuan Li, Ze-Rui Wang +3

Extreme synchrotron blazars, characterized by a first peak in their broadband spectral energy distributions (SEDs) at frequencies exceeding $10^{17}$ Hz, often exhibit a second pea…