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Galaxy clustering on large scales
1Department of Physics, University of Oxford, England.
Summary
Recent observations reveal that the large-scale structure of the universe aligns with predictions from a cold-dark-matter model. This model successfully explains galaxy distribution and cosmic microwave background radiation patterns.
Area of Science:
- Cosmology
- Astrophysics
- Galaxy Formation and Evolution
Background:
- Understanding the large-scale structure of the universe is crucial for testing cosmological models.
- Previous studies relied on various observational techniques to map galaxy distribution.
Purpose of the Study:
- To present recent observational constraints on the large-scale structure of the galaxy distribution.
- To compare these observations with theoretical models, particularly the cold-dark-matter model.
Main Methods:
- Analysis of two-dimensional galaxy surveys and angular correlation functions.
- Comparison with results from galaxy redshift surveys, considering real-space and redshift-space distortions.
- Utilizing galaxy two-point correlation function, rich-cluster two-point correlation function, and galaxy-cluster cross-correlation function.
Main Results:
- Large-scale structure observations are consistent with a scale-invariant, adiabatic, cold-dark-matter Universe.
- The power spectrum with Gamma = Omegah approximately 0.2 provides a good fit for scales greater than approximately 20h-1 Mpc.
- Results align with Cosmic Background Explorer (COBE) satellite data on microwave background anisotropies.
Conclusions:
- The cold-dark-matter model with specific parameters accurately describes observed large-scale structure.
- Observational data from galaxy surveys and cosmic microwave background radiation support this cosmological model.