Reliability of the detection of the Baryon Acoustic Peak

Abstract

The correlation function of the distribution of matter in the universe shows, at large scales, baryon acoustic oscillations, which were imprinted prior to recombination. This feature was first detected in the correlation function of the luminous red galaxies (LRG) of the Sloan Digital Sky Survey (SDSS). The final release (DR7) of the SDSS has been recently made available, and the useful volume is about two times bigger than in the old sample. We present here, for the first time, the redshift space correlation function of this sample at large scales together with that for one shallower, but denser volume-limited subsample drawn from the 2dF redshift survey. We test the reliability of the detection of the acoustic peak at about 100 Mpc/h and the behaviour of the correlation function at larger scales by means of careful estimation of errors. We confirm the presence of the peak in the latest data although broader than in previous detections.

6 pages, 3 figures, 1 table. Version accepted for publication in The Astrophysical Journal Letters. Numerical values of the correlation functions plotted in Fig. 3 can be downloaded from http://www.uv.es/martinez . The revised version corrects an error in the magnitudes printed in Table 1. The galaxy sample itself has not changed

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• Acoustic oscillations in the SDSS DR4 Luminous Red Galaxy sample power spectrum
• Measuring the matter density using baryon oscillations in the SDSS
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