Four New BL Lac Surveys: Sampling New Populations
Abstract
The advent of large area deep radio and X-ray surveys is leading to the creation of many new BL Lac samples. In particular, the ROSAT All-Sky, Green Bank and FIRST surveys are proving to be rich sources of new BL Lacs. We will discuss the methods used in four independent BL Lac searches based on these surveys. Comparison of the broadband spectral energy distributions of these BL Lacs with those of previously known objects clearly points to the existence of a large previously unrecognized population of objects with characteristics intermediate between those exhibited by Low and High energy peaked BL Lacs.
Keywords
Cite
@article{arxiv.astro-ph/9810243,
title = {Four New BL Lac Surveys: Sampling New Populations},
author = {S. A. Laurent-Muehleisen and R. H. Becker and W. Brinkmann and J. Siebert and E. D. Feigelson and R. I. Kollgaard and G. D. Schmidt and P. S. Smith},
journal= {arXiv preprint arXiv:astro-ph/9810243},
year = {2007}
}
Comments
4 pages, 3 postscript figures, To be published in the Proceedings of the conference "BL Lac Phenomenon" held in Turku, Finland, June 22-26, 1998