Asian Journal of Research and Reviews in Physics

We have used both analytical methods and statistical methods to find if there is any possible effect of observed space-time expansion on some extragalactic sources – the radio-loud quasars. This is done by carrying out linear regression analysis on larger radio-loud quasars and on smaller radio-loud quasars. On the luminosity (P)/redshift(z) plane for the more extendedquasars, we find that the luminosities of these sources are attenuated as space-time expansion proceeds. Though their more compact counterparts show similar trend on the (P - z) plot, however, they indicate dissimilarity in their gradient.The result of the more compact sources shows steeper slope (4.33), while that of the more extended sourcesindicates a flatter slope (0.04). This indicates that the more compact quasars have higher luminosities at earlier epoch than the more extended quasars. This disagreement must have originated from the ambient environments in which they are located, since the two sub-classes of objects have been shown to be situated in different ambient media. So, their observable physical processes should not be expected to be precisely the same. Therefore, since the more compact quasars are generally sub-galactic in dimensions, they are affected more by their denser ambient gases; as well as the gravitational pull within the galaxies they are residing. This is not the case with the intergalactic media. In this medium, ambient density is very much smaller than that of the interstellar medium; and the components (jets and lobes) are not held by gravitational pull, so, space expansion should unsurprisingly attenuate the luminosities of the more extended radio-loud quasars. This is shown in the obtained relation, P~ - v^4.33. The results simply establishes that the observed universal space-time expansion may pose a threat to the luminosities of the more extended radio-loud quasars. If this is true, the implication is that photons in the intergalactic media would suffer more delay in their propagation as ‘elements of space-time’ pop in between them.