Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-09
Astronomy and Astrophysics
Astrophysics
Proceedings of "Multiwavelength AGN Surveys", Cozumel, Dec 2003
Scientific paper
BL Lac objects are an elusive and rare class of active galactic nuclei. For years their evolutionary behavior has appeared inconsistent with the trend observed in the population of AGN at large. The so-called ``negative'' evolution implies that BL Lacs were either less or fainter in the past. This effect is stronger for BL Lacs selected in X-ray surveys. We have investigated if one of the selection criteria, namely the flat-radio spectrum (imposed on the Radio-selected but not on the X-ray-selected samples), might explain the different evolutionary trend.
Cavallotti Francesca
Rector Travis
Stocke John T.
Wolter Anna
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