Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8401p&link_type=abstract
American Astronomical Society Meeting 210, #84.01; Bulletin of the American Astronomical Society, Vol. 39, p.193
Mathematics
Logic
Scientific paper
We present a measurement of the galaxy three point correlation function on huge scales. We use the spectroscopic Luminous Red Galaxy (LRG) sample from the Sloan Digital Sky Survey (SDSS) with sky coverage equivalent to the SDSS Data Release 5 (DR5) dataset. We measure the three point correlation function in redshift space on scales where the sides of the triangles are between 10 and 200 Mpc/h. We parameterize our measurement by the lengths of two sides of the triangle and a multipole expansion of the opening angle between them and present our measurements of the first few multipoles, which capture most of the relevant information and reduce the effective noise. We discuss features in the shape of our measurements and implications for cosmological parameters via a joint analysis with the two point correlation function and comparisons with N-body simulations. As an alternative to resampling methods (ie. jack-knife), we discuss our implementation of a shrinkage estimation technique to estimate our covariance matrix in the regime where the covariance matrix has many more elements than available realizations.
Pope Adrian C.
Szapudi István
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