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21-cm Absorption of the Radiation from 3C273

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Abstract

THE radio source 3C273 has been identified1,2 with a star-like object of about thirteenth magnitude having a faint jet. However, the optical spectrum of the star contains a number of broad emission features which can be explained as hydrogen, magnesium and oxygen lines with a red-shift δλ/λ0 of 0.158 (refs. 2 and 3). Schmidt suggests that the stellar object is either a nearby ultradense star or, more probably, the abnormally luminous nuclear region of a galaxy at a distance of about 500 megaparsecs. The second possibility would make 3C273 the most luminous object known.

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References

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Authors and Affiliations

  1. C.S.I.R.O., Radiophysics Laboratory, University Grounds, Sydney

    B. J. ROBINSON, K. J. VAN DAMME & J. A. KOEHLER

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  1. B. J. ROBINSON
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  2. K. J. VAN DAMME
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  3. J. A. KOEHLER
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ROBINSON, B., VAN DAMME, K. & KOEHLER, J. 21-cm Absorption of the Radiation from 3C273. Nature 199, 990–991 (1963). https://doi.org/10.1038/199990b0

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