Extreme blazars

Details Extreme blazars Extreme blazars

1998-12-10

arxiv.org/abs/astro-ph/9812202v1

Astropart.Phys. 11 (1999) 11-18

Astronomy and Astrophysics

Astrophysics

15 pages, 6 figures, invited paper at the VERITAS workshop on TeV Astrophysics of Extragalactic Objects

Scientific paper

10.1016/S0927-6505(99)00018-3

The recent Cherenkov telescope observations and detections of the BL Lac objects Mkn 421, Mkn 501, 1ES 2344+514, PKS 2155--304 and possibly 1ES 1959+658 have shown that there exists a subclass of BL Lac objects emitting a substantial fraction of their power between the GeV and the TeV bands. These are the sources whose synchrotron spectrum peaks, in a $\nu$--$\nu F_{\nu}$ representation, in the EUV or X-ray band. Here I suggest that even more extreme BL Lacs can exist, whose synchrotron spectrum peaks in the MeV band. These sources should emit a substantial fraction of their power in the TeV band by the inverse Compton process. Limits to the maximum possible emitted frequencies are discussed.

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