Acoustic oscillations in the SDSS DR4 Luminous Red Galaxy sample power spectrum

Abstract

We calculate the redshift-space power spectrum of the Sloan Digital Sky Survey (SDSS) Data Release 4 (DR4) Luminous Red Galaxy (LRG) sample, finding evidence for a full series of acoustic features down to the scales of \sim 0.2 hMpc^{-1}. This corresponds up to the 7th peak in the CMB angular power spectrum. The acoustic scale derived, (105.4 \pm 2.3) h^{-1}Mpc, agrees very well with the ``concordance'' model prediction and also with the one determined via the analysis of the spatial two-point correlation function by Eisenstein et al. (2005). The models with baryonic features are favored by 3.3 σover their ``smoothed-out'' counterparts without any oscillatory behavior.

Extended version of the previous work astro-ph/0507678, now including new data from the SDSS DR4. 17 pages, 18 figures, accepted for publication in A&A

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