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Four New BL Lac Surveys: Sampling New Populations

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arxiv astro-ph/9810243 v1 pith:GEN3E5SR submitted 1998-10-15 astro-ph

classification astro-ph
keywords surveyslacsenergyfourlargeobjectspreviouslythose
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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.

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