Multicolour observations, inhomogeneity and evolution

被引：13

作者：

Hellaby, C ^{[1
]}

机构：

[1] Univ Cape Town, Dept Math & Appl Math, ZA-7701 Rondebosch, South Africa

来源：

ASTRONOMY & ASTROPHYSICS | 2001年 / 372卷 / 02期

关键词：

large scale structure of Universe; galaxies : evolution;

D O I：

10.1051/0004-6361:20010172

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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, constraints 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.

引用

页码：357 / 363

页数：7

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