Abstract
Apparent superluminal expansion in compact radio sources has provided strong evidence for relativistic motion in these objects. Originally seen only in bright, core-dominated sources, the effect has been found in sources with different morphologies, core strengths, and identifications. The list of superluminals is still dominated by quasars but it now includes several BL Lac objects.
The National Radio Astronomy Observatory is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation of the United States.
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Zensus, J.A. (1989). Superluminal motion in quasars and BL Lac objects. In: Maraschi, L., Maccacaro, T., Ulrich, M.H. (eds) BL Lac Objects. Lecture Notes in Physics, vol 334. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0031138
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DOI: https://doi.org/10.1007/BFb0031138
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