On the cosmological distance and redshift between any two objects
arXiv:astro-ph/0007341 · doi:10.1046/j.1365-8711.2000.03874.x
Abstract
We discuss the problem of how to calculate the distance between two cosmological objects given their redshifts and angular separation on the sky. Although of a fundamental nature, this problem and its solution seem to lack a detailed description in the literature. We present a new variant of its solution and quantitatively assess the most commonly used approximation.
5 pages, LaTeX, 7 Postscript figures, accepted for publication in MNRAS