Author： Heidt J. Nilsson K.
Publisher： Edp Sciences
E-ISSN： 1432-0746|529|issue|A162-A162
ISSN： 0004-6361
Source： Astronomy & Astrophysics, Vol.529, Iss.issue, 2011-04, pp. : A162-A162
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Abstract
We present and discuss polarimetric observations of 182 targets drawn from an optically selected sample of 240 probable BL Lac candidates out of the SDSS compiled by Collinge et al. (2005, AJ, 129, 2542). In contrast to most other BL Lac candidate samples extracted from the SDSS, its radio- and/or X-ray properties have not been taken into account for its derivation. Thus, because its selection is based on optical properties alone, it may be less prone to selection effects inherent in other samples derived at different frequencies, so it offers a unique opportunity to extract the first unbiased BL Lac luminosity function that is suitably large in size.
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