Comparing Correlation Lengths of Red and Blue Galaxies: A New Standard Length for Testing Cosmic Isotropy
| dc.creator | Longo, Michael J. | |
| dc.date | 2009-03-10 | |
| dc.date.accessioned | 2026-07-07T12:50:55Z | |
| dc.date.available | 2026-07-07T12:50:55Z | |
| dc.description | I introduce a simple empirical measure of average galaxy cluster sizes based on a comparison of the correlation lengths of red galaxies with blue that can provide a more accurate and bias-free measure of the average size and number density of galaxy clusters. Using 269,000 galaxies from the SDSS DR6 survey, I show that this 3D correlation length, averaged over many clusters, remains very nearly constant at L0= 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 and provides a means of testing the standard cosmological model that is almost free of selection biases. The unprecedented accuracy of the technique allows the possibility of sensitive searches for large-scale inhomogeneities. Applying the same technique to the Millennium Simulation galaxies I find very good agreement between it and the SDSS galaxies. | |
| dc.description | 11 pages | |
| dc.identifier | https://arxiv.org/abs/0903.1803 | |
| dc.identifier | http://arxiv.org/abs/0903.1803 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/222835 | |
| dc.subject | Cosmology and Nongalactic Astrophysics | |
| dc.subject | Astrophysics of Galaxies | |
| dc.title | Comparing Correlation Lengths of Red and Blue Galaxies: A New Standard Length for Testing Cosmic Isotropy | |
| dc.type | text |