Extended radio sources evolution and the angular size redshift relation

被引：0
|
作者：
Carvalho, J. C.
Alcaniz, J. S.
Lima, J. A. S.
机构：
[1] Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
[2] Observ Nacl, BR-20921400 Rio De Janeiro, Brazil
[3] Univ Sao Paulo, Inst Astron, BR-05508900 Sao Paulo, Brazil
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2007年 / 16卷 / 2-3期
关键词：
cosmology; distance scale; radio sources;
D O I：
10.1142/S0218271807010171
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The angular diameter versus redshift relation in the standard FRW model is rediscussed. The present data imply that the standard FRW. at cosmology (q(0) = 1/2) cannot be the best-fit model when evolution is absent. By using a simple analytical model to describe the expansion of jets in extended radio sources, a redshift dependence of the proper length of the sources is obtained. For these sources, we show that evolution contributes in such a way that the models can be compatible with the observations of the angular diameter versus redshift cosmological test.
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页码：397 / 402
页数：6
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