1 research outputs found
Minimal Angular Size of Distant Sources in Open, CDM, and Scalar Field Cosmologies
We propose a simple method for determining the redshift at which the
angular size of an extragalactic source with fixed proper diameter takes its
minimal value. A closed analytical expression, which is quite convenient for
numerical evaluation is derived. The method is exemplified with the following
FRW type expanding universes: the open matter dominated models
(), a critical density model with cosmological constant
(), and the class of scalar field cosmologies proposed
by Ratra and Peebles. The influence of systematic evolutionary effects is
briefly discussed.Comment: 8 pages, 1 postscript figures, uses revtex macro