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Paper: The REX Survey: How to Find a Large and Complete Sample of BL Lacs
Volume: 159, BL Lac Phenomenon
Page: 503
Authors: Wolter, A.; Caccianiga, A.; Della Ceca, R.; Maccacaro, T.; Giaia, I. M.
Abstract: The number of known BL Lacs is not large, if compared to that of other classes of AGN, and in particular the statistically complete samples are made of a few tens of objects. This fact makes any quantitative derivation of the global properties of the class subject to large uncertainties. We have started a project to find a sizable, complete and deep sample of Radio Emitting X-ray sources (REXs) using the available data from a VLA survey (NVSS) and the ROSAT PSPC archive. We expect that the sample will contain, by the end of the identification process, about 200 BL Lacs, enabling us to better study their statistical properties, like the X-ray, radio and optical luminosity functions and their cosmological evolution, and to address the apparent dichotomy of RBL and XBL using a unique sample to test the two classes at the same time. We will describe the project and its current status.
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