Superluminal apparent motions in distant radio sources

Details Superluminal apparent motions in distant radio sources Superluminal apparent motions in distant radio sources

2004-07-22

arxiv.org/abs/astro-ph/0407478v3

Am.J.Phys. 73 (2005) 639-643

Astronomy and Astrophysics

Astrophysics

14 pages, no figures; matches the version accepted for publication in the American Journal of Physics

Scientific paper

10.1119/1.1858487

We derive the prediction of the standard model of superluminal radio sources for the apparent transverse velocity of a radio source located at redshift z. The apparent velocity of the source is reduced by a factor of 1 + z compared to that of a similar nearby source. The cause of this reduction is recession of the distant source due to the expansion of the universe. The apparent velocity of a source can be estimated from its redshift and proper motion using the values of the Hubble constant and the mean densities of different energy components in the universe. We derive an expression for the velocity valid for the currently favored cosmological model: a flat universe with a nonzero cosmological constant.

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