Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428...61s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 61-64
Astronomy and Astrophysics
Astrophysics
6
Astronomical Models, Cosmology, Missing Mass (Astrophysics), Radio Sources (Astronomy), Very Long Base Interferometry, Angular Distribution, Assumptions, Galactic Evolution, Nonrelativistic Mechanics, Red Shift
Scientific paper
The angular size/redshift relation in cosmological models with exotic forms of matter (cosmological constant, strings, textures) is compared with very long baseline interferometry data on compact radio sources. It is shown that observational data favor the result of Kellermann (Omega approximately equal to 1) and exclude a cosmological constant as a candidate for missing mass in the universe. It is also shown that in the model with nonrelativistic matter and strings (textures), VLBI data can be reconciled with the angular size/redshift relation corresponding to the low value of the Omega parameter (Omega approximately equal to 0.3), but then a large value of the energy density of the exotic form of matter (1.6 less than OmegasO less than 2.3) is required.
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