Abstract
Weymann and Wilcox1 have recently claimed that there is no evidence that the true occurrence of absorption lines in quasi-stellar objects (QSOs) is a function of red-shift. Such a conclusion, if true, might be considered as evidence against the screening hypothesis discussed by several authors2–4. We feel, however, that the discussion of the data presented by Weymann and Wilcox does not warrant their strongly worded conclusion, and in fact that the data available indicate that the presence of C IV in absorption can be explained by the screening hypothesis.
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References
Weymann, R. J., and Wilcox, R. C., Nature, 219, 1031 (1968).
Bahcall, J. N., Greenstein, J. L., and Sargeant, W. L. W., Ap. J., 153, L89 (1968).
Kardashev, N., Ap. J., 150, L135 (1967).
Roeder, R. C., and Verreault, R. T., Ap. J. (in the press).
Solheim, J. E., Nature, 219, 45 (1968).
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ROEDER, R., VERREAULT, R. Absorption Lines in the Spectra of Quasi-stellar Objects. Nature 220, 772–773 (1968). https://doi.org/10.1038/220772a0
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DOI: https://doi.org/10.1038/220772a0
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