Abstract
THE first clear positive evidence for the existence of inter-galactic atomic neutral hydrogen was advanced in 1966 by Koehler and Robinson1 from absorption effects in the continuum radio spectra of Fornax A, 3(C 273, and Virgo A near 21 cm wavelength. In particular for Virgo A they observed a Gaussian absorption profile centred at a radial velocity of + 1,200 km s−1 with an optical depth of 59 ± 3 × 10−4 and a full width at half power of 920 km s−1. The purpose of this letter is to report that this particular measurement is negated by recent observations with the large radio telescope at Nançay. The upper limit for the amplitude of a Gaussian profile of the form reported by Koehler and Robinson is 2 × 10−3, which is one third of their positive result.
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References
Koehler, J. A., and Robinson, B. J., Astrophys. J., 146, 488 (1966).
Blum, E. J., Boischot, A., and Lequeux, J., Proc. IRE Australia, 24, 208 (1963).
Blum, E. J., Delannoy, J., LeRoux, E., and Weliachew, L., CR Acad. Sci. Paris, 262, 1640 (1966).
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Macdonald, G. H., Kenderdine, S., and Neville, A. C., Mon. Not. Roy. Astro. Soc., 138, 259 (1968).
Ruze, J., Proc. IEEE, 54, 633 (1966).
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ALLEN, R. Intergalactic HYdrogen in the Virgo Cluster of Galaxies. Nature 220, 147–148 (1968). https://doi.org/10.1038/220147a0
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DOI: https://doi.org/10.1038/220147a0
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