Surveys and the Blazar Parameter Space

Details Surveys and the Blazar Parameter Space Surveys and the Blazar Parameter Space

2000-12-08

arxiv.org/abs/astro-ph/0012185v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, to appear in "Blazar Demographics & Physics", ed. P. Padovani & C. M. Urry

Scientific paper

The rareness of blazars, combined with the previous history of relatively shallow, single-band surveys, has dramatically colored our perception of these objects. Despite a quarter-century of research, it is not at all clear whether current samples can be combined to give us a relatively unbiased view of blazar properties, or whether they present a view so heavily affected by biases inherent in single-band surveys that a synthesis is impossible. We will use the coverage of X-ray/radio flux space for existing surveys to assess their biases. Only new, deeper blazar surveys approach the level needed in depth and coverage of parameter space to give us a less biased view of blazars. These surveys have drastically increased our knowledge of blazars' properties. We will specifically review the discovery of ``blue'' blazars, objects with broad emission lines but broadband spectral characteristics similar to HBL BL Lac objects.

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