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Radio properties of BL Lac type objects

Abstract

New radio observations of nine BL Lac type objects are discussed. It is shown that in their radio properties, these objects range from highly variable sources with a strong centimetre excess to non-variable sources with comparatively steep spectra. All the evidence strongly suggests that the most variable BL Lac type objects are extremely young.

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Altschuler, D., Wardle, J. Radio properties of BL Lac type objects. Nature 255, 306–310 (1975). https://doi.org/10.1038/255306a0

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