Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381....6k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 6-13. Research supported by NATO, USIBSF, and Charles
Astronomy and Astrophysics
Astronomy
21
Intergalactic Media, Radio Sources (Astronomy), Spatial Distribution, Compact Galaxies, Cosmology, Gravitational Lenses
Scientific paper
The constraints that can be imposed on the cosmic density of uniformly distributed intergalactic compact objects in the mass range of 10 million to 1 billion solar masses, 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, a density parameter for mass in this range greater than 0.4 is excluded at the 99.7 percent confidence level. Observations using the VLBA should allow one to exclude or discover a density parameter greater than about 0.001 for compact objects in the mass range of 0.1-100 solar masses.
Blandford Roger. D.
Kassiola Aggeliki
Kovner Israel
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