SIMBAD references

2002ApJ...566..181C - Astrophys. J., 566, 181-186 (2002/February-2)

On the cosmological evolution of BL Lacertae objects.

CACCIANIGA A., MACCACARO T., WOLTER A., DELLA CECA R. and GIOIA I.M.

Abstract (from CDS):

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 ergs.s–1.cm–2) and relatively bright optical counterparts (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 active galactic nuclei. The Ve/Va analysis applied to the subsample of the high-energy-peaked BL Lac objects (HBLs) 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 not selected in our sample.

Abstract Copyright:

Journal keyword(s): Galaxies: BL Lacertae Objects: General - Galaxies: Active - Galaxies: Quasars: General - Surveys

Simbad objects: 55

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