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On the cosmological evolution of BL Lacs
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On the cosmological evolution of BL Lacs
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We study the cosmological evolution of BL Lac objects by applying the Ve/Va analysis to a new sample of 55 objects presented for the first time in this paper. This sample has been selected from the 239 sources with the brightest X-ray flux (>4X10^-13 erg s^-1 cm^-2) and relatively bright optical counterpart (B<20.5) among the ~1600 objects included in the REX survey. The uniform distribution of the Ve/Va values found in the sample suggests that BL Lac objects are not affected by a strong cosmological evolution in contrast with the behavior observed in the emission line AGNs. The Ve/Va analysis applied to the subsample of the High energy peaked BL Lacs (HBL) does not reveal a significant departure from a uniform distribution. This result suggests either that the cosmological evolution is less extreme than that previously found in other samples or that it is carried out only by a minority of objects, namely by the most extreme HBLs.
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Cited by 1 Pith paper
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Study of Flat Spectrum Radio Quasars and BL Lacertae Objects as Sources of Diffusive Ultra High-Energy Cosmic Rays
BL Lacs remain consistent with UHECR observations while FSRQs are disfavoured by anisotropy and source density mismatches after propagation modeling.
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