Abstract
McCREA1 has raised the interesting possibility that the line spectrum from quasi-stellar objects could arise from a jet aimed toward the observer. McCrea states that this sort of model avoids the intergalactic absorption of Lyman α from 3C9 predicted by Gunn and Peterson2 if the density of neutral intergalactic hydrogen at z = 2 is of the order of 10−11 cm−3 or more. Here I shall point out that this model still leads to difficulties with Lyman α absorption of the type predicted by Gunn and Peterson.
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References
McCrea, W. H., Nature, 218, 257 (1968).
Gunn, J. E., and Peterson, B. A., Astrophys. J., 142, 1633 (1965).
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NOERDLINGER, P. Jets in Quasi-stellar Objects. Nature 219, 595 (1968). https://doi.org/10.1038/219595a0
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DOI: https://doi.org/10.1038/219595a0
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