Follow-up observations reclassify 7 of 10 candidate ultra extreme high-energy-peaked BL Lacs as AGNs, with only 2 possibly compatible with MeV-peaked SEDs.
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Hunting for extreme high-energy-peaked BL Lacs: Rare to find and difficult to classify
Follow-up observations reclassify 7 of 10 candidate ultra extreme high-energy-peaked BL Lacs as AGNs, with only 2 possibly compatible with MeV-peaked SEDs.