VLBI Data for Compact Radio Sources versus Exotic Forms of Matter in the Universe
Abstract
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} = 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} = 0.3), but then a large value of the energy density of the exotic form of matter (1.6 < {OMEGA}_50_ < 2.3) is required.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1994
- DOI:
- 10.1086/174220
- Bibcode:
- 1994ApJ...428...61S
- Keywords:
-
- Astronomical Models;
- Cosmology;
- Missing Mass (Astrophysics);
- Radio Sources (Astronomy);
- Very Long Base Interferometry;
- Angular Distribution;
- Assumptions;
- Galactic Evolution;
- Nonrelativistic Mechanics;
- Red Shift;
- Astrophysics;
- COSMIC STRINGS;
- COSMOLOGY: OBSERVATIONS;
- TECHNIQUES: INTERFEROMETRIC