Abstract
CTA 21 has long been the outstanding example of a strong, compact radio source lacking an optical identification. We report the discovery at infrared wavelengths of the counterpart of CTA 21, and show that its spectral shape is unusual.
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Allen, D.A., Wright, A.E. & Abies, J.G. The identification of CTA 21. J Astrophys Astron 3, 189–192 (1982). https://doi.org/10.1007/BF02714802
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DOI: https://doi.org/10.1007/BF02714802