angular correlation function

{{Short description|Measure of the projected clustering of galaxies}}

The angular correlation function is a function which measures the projected clustering of galaxies, due to discrepancies between their actual and expected distributions.[https://ui.adsabs.harvard.edu/abs/2005ApJ...619..147M/abstract The Galaxy Angular Correlation Functions and Power Spectrum from the Two Micron All Sky Survey] The function may be computed as follows: $w(\backslash theta)=\backslash frac\{1\}\{N\}\backslash frac\{dP\}\{d\backslash Omega\}-1$, where $P$ represents the conditional probability of finding a galaxy, $\backslash Omega$ denotes the solid angle, and $N$ is the mean number density. In a homogeneous universe, the angular correlation scales with a characteristic depth.{{cite web|url=https://ned.ipac.caltech.edu/level5/March04/Jones/Jones5_2.html|title=B. The correlation function: galaxies|access-date=2021-06-09}}