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On the cosmological evolution of BL Lacs

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arxiv astro-ph/0110334 v1 pith:BEZQGSSS submitted 2001-10-15 astro-ph

A. Caccianiga , T. Maccacaro , A. Wolter , R. Della Ceca , I.M. Gioia This is my paper
classification astro-ph
keywords objectscosmologicalevolutionsampleanalysisdistributionextremefound
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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

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Study of Flat Spectrum Radio Quasars and BL Lacertae Objects as Sources of Diffusive Ultra High-Energy Cosmic Rays

    astro-ph.HE 2025-11 unverdicted novelty 4.0 of 10

    BL Lacs remain consistent with UHECR observations while FSRQs are disfavoured by anisotropy and source density mismatches after propagation modeling.

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