Correlation Lengths of Red and Blue Galaxies: A New Cosmic Ruler

Details Correlation Lengths of Red and Blue Galaxies: A New Cosmic Ruler Correlation Lengths of Red and Blue Galaxies: A New Cosmic Ruler

2008-10-22

arxiv.org/abs/0810.4066v1

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures

Scientific paper

A comparison of the correlation lengths of red galaxies with blue can provide a new cosmic ruler. Using 269,000 galaxies from the SDSS DR6 survey, I show that the 3D correlation length averaged over many clusters remains very nearly constant at Lo=4.797+/-0.024 Mpc/h from small redshifts out to redshifts of 0.5. This serves as a new measure of cosmic length scales as well as a means of testing the standard cosmological model that is almost free of selection biases. The cluster number density also appears to remain constant over this redshift range.

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