BOUNDS ON INTERGALACTIC COMPACT OBJECTS FROM OBSERVATIONS OF COMPACT RADIO-SOURCES

被引：30

作者：

KASSIOLA, A ^{[1
]}

KOVNER, I ^{[1
]}

BLANDFORD, RD ^{[1
]}

机构：

[1] CALTECH,PASADENA,CA 91125

来源：

ASTROPHYSICAL JOURNAL | 1991年 / 381卷 / 01期

关键词：

COSMOLOGY; GALAXIES; INTERGALACTIC MEDIUM; GRAVITATIONAL LENSES; RADIO SOURCES;

D O I：

10.1086/170624

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the constraints that can be imposed on the cosmic density of uniformly distributed intergalactic compact objects in the mass range 10(7) less-than-or-similar-to M/M. less-than-or-similar-to 10(9) using VLBI observations of compact radio sources. A compact object at a sufficiently small angular separation from a compact radio source produces a deamplified and inverted secondary image. No such cases are known. Using published maps of compact radio sources and assuming an Einstein-de Sitter cosmology, we exclude a density parameter for mass in this range OMEGA-M > 0.4 at the 99.7% confidence level. Observations using the VLBA should allow one to exclude or discover OMEGA-M greater-than-or-similar-to 10(-3) for compact objects in the mass range 10(5) less-than-or-similar-to M/M. less-than-or-similar-to 10(8).

引用

页码：6 / 13

页数：8

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