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The cosmological evolution of BL Lacs: The REX point of view

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arxiv astro-ph/0009388 v1 pith:WHI5K5UX submitted 2000-09-25 astro-ph

The cosmological evolution of BL Lacs: The REX point of view

classification astro-ph
keywords sampleevolutioncosmologicallacsdeeperlimitssurveyx-ray
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present the results on the cosmological evolution of BL Lac objects as derived from a statistically complete sample of 44 BL Lacs selected from the X-ray bright tail of the REX survey. With this sample, we have investigated the cosmological properties of BL Lacs taking into account the radio, optical and X-ray limits. We infer that no evolution is clearly visible down to the flux limits reached by our sample. On the other hand, deeper samples are probably needed in order to detect the negative evolution found in the EMSS sample. The identification of such deeper sample, extracted from the REX survey, is in progress.

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