2008/07/31 by Jounghun Lee, Ue-Li Pen
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/592820
published as Astrophys.J. 686 (2008) L1-L4 · ApJL in press, revised version, discussion improved, 4 pages, 3 figures
arxiv created 2008/08/27 · openalex publication_date 2008/09/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We analyze the photometric redshift catalog of the Sloan Digital Sky Survey Data Release 5 (SDSS DR5) to estimate the Fisher information in the galaxy angular power spectrum with the help of the Rimes-Hamilton technique. It is found that the amount of Fisher information contained in the galaxy angular power spectrum is saturated at lensing multipole scale 300 ⩽ l⩽ 2000 in the redshift range 0.1 ≤ photo- z < 0.5. At l = 2000, the observed information is 2 orders of magnitude lower than the case of Gaussian fluctuations. This supports observationally that the translinear regime of the density power spectrum contains little independent information about the initial cosmological conditions, which is consistent with the numerical trend shown by Rimes-Hamilton. Our results also suggest that the Gaussian-noise description may not be valid in weak-lensing measurements.