Angular Correlation Function

The angular correlation function is a function which measures the projected clustering of galaxies, due to discrepancies between their actual and expected distributions. The function may be computed as follows: $w(\theta)=\frac\frac-1$, where $P$ represents the conditional probability of finding a galaxy, $\Omega$ denotes the solid angle, and $N$ is the mean number density. In a homogeneous universe, the angular correlation scales with a characteristic depth.

References

Galaxy clusters
Equations of astronomy

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