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The power spectrum from the angular distribution of galaxies in the CFHTLS-Wide fields at redshift ~0.7

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arxiv 1112.0008 v2 pith:HY4K5MT2 submitted 2011-11-30 astro-ph.CO

B. R. Granett , L. Guzzo , J. Coupon , S. Arnouts , P. Hudelot , O. Ilbert , H. J. McCracken , Y. Mellier
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C. Adami J. Bel M. Bolzonella D. Bottini A. Cappi O. Cucciati S. de la Torre P. Franzetti A. Fritz B. Garilli A. Iovino J. Krywult V. Le Brun O. Le Fevre D. Maccagni K. Malek F. Marulli B. Meneux L. Paioro M. Polletta A. Pollo M. Scodeggio H. Schlagenhaufer L. Tasca R. Tojeiro D. Vergani A. Zanichelli
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classification astro-ph.CO
keywords redshiftpowerspectrumsurveyangularbiasdistributionfield
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We measure the real-space galaxy power spectrum on large scales at redshifts 0.5 to 1.2 using optical colour-selected samples from the CFHT Legacy Survey. With the redshift distributions measured with a preliminary ~14000 spectroscopic redshifts from the VIMOS Public Extragalactic Redshift Survey (VIPERS), we deproject the angular distribution and directly estimate the three-dimensional power spectrum. We use a maximum likelihood estimator that is optimal for a Gaussian random field giving well-defined window functions and error estimates. This measurement presents an initial look at the large-scale structure field probed by the VIPERS survey. We measure the galaxy bias of the VIPERS-like sample to be b_g=1.38 +- 0.05 (sigma_8=0.8) on scales k<0.2h/mpc averaged over 0.5<z<1.2. We further investigate three photometric redshift slices, and marginalising over the bias factors while keeping other LCDM parameters fixed, we find the matter density Omega_m=0.30+-0.06.

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