Hunting for extreme high-energy-peaked BL Lacs: Rare to find and difficult to classify

Loredana Bassani, Raffaella Landi, Nicola Masetti

We explore the possible existence of a new population of BL Lacs, called ultra extreme high-energy-peaked BL Lacs (UEHBLs), whose synchrotron emission component peaks in the MeV ba…