Abstract
Deep charge-coupled device (CCD) images of the quasi-stellar object (QSO) identified with the Einstein X-ray source Pavo XD-10 show an optical structure that is dramatically extended. Here we discuss the morphology, the photometry from the CCD data, and the limited spectral information which indicates a redshift (z) of 0.72 for the system. We show that if the extended structure represents a galaxy hosting the z = 0.72 QSO, the galaxy luminosity is 2 mag brighter than the host galaxies detected for QSOs at lower redshifts. Instead, the system may be the result of a galaxy-galaxy interaction. A third and more speculative possibility is that it is the result of gravitational lensing, with much of the ‘underlying’ structure representing the lens galaxy in the line-of-sight.
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Gilmozzi, R., Wall, J., Murdin, P. et al. Pavo XD-10, an X-ray QSO with extended optical structure. Nature 313, 557–559 (1985). https://doi.org/10.1038/313557a0
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DOI: https://doi.org/10.1038/313557a0
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