### Radio Source Counts

**(Source Counts)**
(using radio source population characteristics to determine curvature)

In Cosmology, **Radio Source Counts** (or just **Source Counts**)
is a method of detecting the Curvature of space. In a flat,
Euclidean space, a uniform distribution of Radio sources
(the scale of interest being cosmological distances, i.e., Radio Galaxies),
with the same distribution of Luminosities throughout, implies
a certain pattern to the count of detectable sources at each luminosity:

log N = -1.5 log S

- S - a given Flux Density.
- N - number of sources at least as bright as S.

Divergence from this gives information about the geometry of the
universe over time.

(*cosmology,radio*)
http://en.wikipedia.org/wiki/Source_counts

https://ned.ipac.caltech.edu/level5/Sept04/Condon/Condon4_2.html

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