A new classification and a two-parameter unification of BL Lacertae objects
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A new continuous classification system for BL Lacertae (BL Lac) objects is proposed. The peak frequency of the synchrotron component in the $νL_ν$ spectrum is used as a classifying parameter. The application of the accelerating inner jet model to complete BL Lac samples suggests that the range of the observed properties may be explained by adopting a description based on two parameters: the jet angle to the line of sight, and the relativistic electron kinetic luminosity.
4 pages, 2 figures. Presented at the workshop on 'Blazars, black holes and jets' (Girona, Spain, 9-12 September 1996); paper to appear in Astrophysics and Space Science
4 pages, 2 figures. Presented at the workshop on 'Blazars, black holes and jets' (Girona, Spain, 9-12 September 1996); paper to appear in Astrophysics and Space Science