Letter | Published:

A Model of the Quasi-stellar Radio Variable CTA 102

Naturevolume 207pages738740 (1965) | Download Citation

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Abstract

ACCORDING to Sholomitsky1, the quasi-stellar2 radio source CTA 102 (ref. 3) has a variable flux density at 32.5 cm, the period being about 100 days. Sholomitsky takes this to mean that the source cannot be larger than 0.1 parsec, which is the distance light travels in one period. Since its angular diameter is not less than about 0.01 sec4,5, he concludes that it must be closer than 2 Mpc, and is possibly inside our own Galaxy. However, Schmidt6 has recently announced that the optical object identified with CTA 102 has a red shift z = δλ/λ of 1.037, and so is probably at a distance comparable with the radius of the universe ( 3,000 Mpc).

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References

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    Sholomitsky, G. B., I.A.U. Information Bulletin on Variable Stars, No. 83 (Feb. 27, 1965).

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    Harris, D. E., and Roberts, J. A., Publ. Astro. Soc. Pacific, 72, 237 (1960).

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    Slish, V. I., Nature, 199, 682 (1963).

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    Williams, P. J. S., Nature, 200, 56 (1963).

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    Schmidt, M., Astrophys. J., 141, 1295 (1965).

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    Menon, T. K., Nature, 206, 810 (1965).

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    Layzer, D., Astrophys. J., 141, 837 (1965).

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    Conway, R. G., Kellermann, K. I., and Long, R. J., Mon. Not. Roy. Astro. Soc., 125, 261 (1963).

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    Caswell, J. L., and Wills, D., Nature, 206, 1241 (1965).

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    Haddock, F. T., and Sciama, D. W., Phys. Rev. Letters, 14, 1007 (1965).

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Affiliations

  1. Department of Applied Mathematics and Theoretical Physics, University of Cambridge

    • M. J. REES
    •  & D. W. SCIAMA

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https://doi.org/10.1038/207738a0

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