Abstract
The radio source PKS2155–304 has recently been identified1 with a HEAO 1 X-ray source and a ∼14 mag object that has a featureless spectrum and is interpreted as a member of the BL Lac class. We describe here our optical spectroscopy of this object which reveals two weak emission features at λ 5,820 and 5,870 Å. We suggest that these lines are [O III] λ 4,959, 5,007 redshifted by z = 0.17. This result supports the interpretation of H2155–304 as a highly luminous BL Lac object.
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Charles, P., Thorstensen, J. & Bowyer, S. H2155–304: a highly luminous BL Lac object. Nature 281, 285–286 (1979). https://doi.org/10.1038/281285a0
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DOI: https://doi.org/10.1038/281285a0
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