Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-14
Phys.Rev.Lett. 88 (2002) 021302
Astronomy and Astrophysics
Astrophysics
5 pages; 3 figures; submitted to PRL
Scientific paper
10.1103/PhysRevLett.88.021302
We present a new limit on the cosmological constant based on the absence of correlations between the cosmic microwave background (CMB) and the distribution of distant radio sources. In the cosmological constant-cold dark matter models currently favored, such correlations should have been produced via the integrated Sachs-Wolfe effect, assuming that radio sources trace the local (z=1) matter density. We find no evidence of correlations between the COBE 53Hz microwave map and the NVSS 1.4 GHz radio survey. The implied 95% CL limit on the cosmological constant is Lambda < 0.74, in marginal agreement with the values suggested by recent measurements of the CMB anisotropy and type-IA supernovae observations, 0.6 < Lambda < 0.7. If the cosmological model does lie in this range, then the integrated Sachs-Wolfe effect should be detectable with upcoming CMB maps and radio surveys.
Boughn Stephen P.
Crittenden Robert G.
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