Showing papers on "Deceleration parameter published in 1968"

Radio Sources opposite Quasars as a Cosmological Test

Abstract: IN a previous communication1 I discussed the possibility of having a closed universe model with the pole at a red-shift z ≃ 17 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 17, deceleration parameter q0 = −14 and a density parameter σ0 = 0085 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