2008

Intrinsic Ellipticity Correlation of SDSS Luminous Red Galaxies and Misalignment with their Host Dark Matter Halos

Okumura, Teppei, Jing, Y. P., Li, Cheng

Understand

We investigate the orientation correlation of giant elliptical galaxies by measuring the intrinsic ellipticity correlation function of 83,773 luminous red galaxies (LRGs) at redshifts 0.16 -- 0.47 from the Sloan Digital Sky Survey.

We have accurately determined the correlation up to 30 $h^{-1}$Mpc.
Luminosity dependence of the ellipticity correlation is also detected although the error bars are large, while no evidence is found for its redshift evolution between $z=0.2$ and $z=0.4$.
Then we use a cosmological $N$-body simulation to examine misalignment between the central LRGs and their parent dark matter halos.

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