2008/12/31 by Teppei Okumura, Yipeng Jing, Y. P. Jing
Mathematics · Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics #Classical mechanics #Correlation #Correlation function (quantum field theory) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Gaussian #Geometry #Gravitation #Gravitational lens #Mathematics #Physics #Quantum mechanics #Redshift #Sky #Weak gravitational lensing #astro-ph
paper · pdf · doi:10.1088/0004-637x/694/1/l83
published as Astrophysical Journal Letters 694 (2009) L83-L86 · 4 pages, 3 figures, minor changes made with respect to published version
openalex publication_date 2009/03/03 · arxiv created 2009/03/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We examine whether the gravitational shear–intrinsic ellipticity (GI) correlation function of the luminous red galaxies (LRGs) can be modeled with the distribution function of a misalignment angle advocated recently by Okumura et al. For this purpose, we have accurately measured the GI correlation for the LRGs in the Data Release 6 (DR6) of the Sloan Digital Sky Survey (SDSS), which confirms the results of Hirata et al. who used the DR4 data. By comparing the GI correlation functions in the simulation and in the observation, we find that the GI correlation can be modeled in the current ΛCDM model if the misalignment follows a Gaussian distribution with a zero mean and a typical misalignment angle σ θ = 34.9 +1.9 −2.1 degrees. We also find a correlation between the axis ratios and intrinsic alignments of LRGs. This effect should be taken into account in theoretical modeling of the GI and intrinsic ellipticity–ellipticity correlations for weak lensing surveys.