Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-31
Astron.Astrophys.372:357-363,2001
Astronomy and Astrophysics
Astrophysics
Latex, 8 pages, using Astronomy & Astrophysics class file "aa.cls". No figures. No tables. Submitted to Astronomy & Astrophysi
Scientific paper
10.1051/0004-6361:20010172
We propose a method of testing source evolution theories that is independent of the effects of inhomogeneity, and thus complementary to other studies of evolution. It is suitable for large scale sky surveys, and the new generation of large telescopes. In an earlier paper it was shown that basic cosmological observations - luminosity versus redshift, area distance versus redshift and number counts versus redshift - cannot separate the effects of cosmic inhomogeneity, cosmic evolution and source evolution. We here investigate multicolour observations, and show that by comparing luminosity versus redshift in two or more colours, contraints can be placed on source evolution even if unknown source evolution is present, providing an important test of evolution theories that is complementary to present methods. However, number counts in different colours versus redshift are not useful in separating the effects of source evolution and inhomogeneity.
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