Dark energy and the angular size - Redshift diagram for milliarcsecond radio sources

被引：77
|
作者：
Lima, JAS [1 ]
Alcaniz, JS [1 ]
机构：
[1] Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil
来源：
ASTROPHYSICAL JOURNAL | 2002年 / 566卷 / 01期
关键词：
cosmology : theory; dark matter; distance scale;
D O I：
10.1086/337986
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate observational constraints on the cosmic equation of state from measurements of angular size for a large sample of milliarcsecond compact radio sources. The results are based on a flat Friedmann-Robertson-Walker (FRW) model driven by nonrelativistic matter, plus a smooth, dark energy component parameterized by its equation of state p(x) = omegarho(x) (-1 less than or equal to omega < 0). The allowed intervals for omega and Omega(m) are heavily dependent on the value of the mean projected linear size l. For l similar or equal to 20-30 h(-1) pc, we find Omega(m) <= 0.62, omega <= -0.2, and Omega(m) <= 0.17, omega <= -0.65 (68% c.l.), respectively. As a general result, this analysis shows that if one minimizes chi(2) for the parameters l, Omega m, and omega, the conventional Lambda CDM model (omega = -1) with Omega(m) = 0.2, and l = 22.6h(-1) pc is the best fit for these angular size data.
引用
收藏
页码：15 / 18
页数：4
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