Abstract
IN a previous communication1 I discussed the possibility of having a closed universe model with the pole at a red-shift z ≃ 1.7. One possible observation in such a universe would be images in opposite or near opposite directions to the original object, if the object is not too far from the pole. I showed that this may happen for a few radio sources listed in the 4C radio catalogues2. Another possible observation is to look for radio sources opposite known quasars. To illustrate such an investigation I will refer to a cosmological model with a pole at red-shift 1.7, deceleration parameter q0 = −1.4 and a density parameter σ0 = 0.085. In this model objects must have lifetimes of the order of 1–10 × 109 yr to be seen in two directions, because of the difference in light travel time. This lifetime is too long for a quasar, but it may be possible to observe the object in a pre-quasar or post-quasar stage as a radio source or even as a faint optical object.
Similar content being viewed by others
References
Solheim, J.-E., Nature, 217, 41 (1968).
Pilkington, J. D. H., and Scott, P. F., Mem. Roy. Astro. Soc., 69, 183 (1965). Gower, J. F. R., Scott, P. F., and Wills, D., Mem. Astro. Soc., 71, 49 (1967).
Barbieri, C., Battistini, P., and Nasi, E., Publ. Osserv. Astro. Padova, N 141 (1967).
Bolton, J. G., Gardner, F. F., and Mackey, M. B., Austral. J. Phys., 17, 340 (1964). Price, R. M., and Milne, D. K., Austral. J. Phys., 18, 329 (1965). Day, G. A., Shimmins, A. J., Ekers, R. D., and Cole, D. J., Austral. J. Phys., 19, 35 (1966); ibid., 19, 837 (1966).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
SOLHEIM, JE. Radio Sources opposite Quasars as a Cosmological Test. Nature 219, 45–47 (1968). https://doi.org/10.1038/219045b0
Received:
Issue Date:
DOI: https://doi.org/10.1038/219045b0
- Springer Nature Limited
This article is cited by
-
On redshifts and number counts of extragalactic objects in two cosmological models
Astrophysics and Space Science (1973)
-
Search for Ghost Images: a Statistical Test
Nature (1969)
-
On old universes and galaxy evolution
Astrophysics and Space Science (1969)
-
Eine Bemerkung �ber antipodische Radioquellen
Die Naturwissenschaften (1969)
-
Radio Sources opposite Quasars as a Cosmological Test
Nature (1968)