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The Most Massive Distant Clusters: Determining Ω and σ8
Open accessAbstract
The existence of the three most massive clusters of galaxies observed so far at z > 0.5 is used to constrain the mass density parameter of the universe, Ω, and the amplitude of mass fluctuations, σ 8 . We find Ω=0.2 −0.1 +0.3 and σ 8 =1.2 −0.4 +0.5 (95%). We show that the existence of even the single most distant cluster at z = 0.83, MS 1054-03, with its large gravitational lensing mass, high temperature, and large velocity dispersion, is sufficient to establish powerful constraints. High-density, Ω = 1 (σ 8 ≃ 0.5-0.6) Gaussian models are ruled out by these data (≲10 -6 probability); the Ω = 1 models predict only ~10 -5 massive clusters at z > 0.65 (~10 -3 at z > 0.5) instead of the one (three) clusters observed.
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Cited by
Measurements of Ω and Λ from 42 High‐Redshift Supernovae
Perlmutter, S., Aldering, G., Goldhaber, G., Knop, R. A., Nugent, P., Castro, P. G., Deustua, S., Fabbro, S., Goobar, A., Groom, D. E., et al. (1999) · The Astrophysical Journal · doi:10.1086/307221 · Cited by 18,062
Particle dark matter: evidence, candidates and constraints
Bertone, G., Hooper, D., & Silk, J. (2005) · Physics Reports · doi:10.1016/j.physrep.2004.08.031 · Cited by 4,979
THE CASE FOR A POSITIVE COSMOLOGICAL Λ-TERM
SAHNI, V., & STAROBINSKY, A. (2000) · International Journal of Modern Physics D · doi:10.1142/s0218271800000542 · Cited by 2,767
Carroll, S. M. (2001) · Living Reviews in Relativity · doi:10.12942/lrr-2001-1 · Cited by 2,650
Euclid: I. Overview of the Euclid mission
Euclid Collaboration, Mellier, Y., Abdurro’uf, Acevedo Barroso, J. A., Achúcarro, A., Adamek, J., Adam, R., Addison, G. E., Aghanim, N., Aguena, M., et al. (2025) · Astronomy & Astrophysics · doi:10.1051/0004-6361/202450810 · Cited by 616
Metadata
- Authors
- Bahcall, N. A., & Fan, X.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1998-09
- Volume
- 504
- Issue
- 1
- Pages
- 1-6
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1964218269
- Cited by
- 367
- References
- 0
- FWCI
- 31.59
- Type
- journal article
- Language
- en
- Open access
- green
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