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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DOI: https://doi.org/10.1038/255306a0
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