Journal Article

The angular power spectra of photometric Sloan Digital Sky Survey luminous red galaxies

Shaun A. Thomas, Filipe B. Abdalla and Ofer Lahav

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 3, pages 1669-1685
Published in print April 2011 | ISSN: 0035-8711
Published online April 2011 | e-ISSN: 1365-2966 | DOI:
The angular power spectra of photometric Sloan Digital Sky Survey luminous red galaxies

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We construct new galaxy angular power spectra C based on the extended, updated and final Sloan Digital Sky Survey (SDSS) II luminous red galaxy (LRG) photometric redshift survey – MegaZ (DR7). Encapsulating 7746 deg2 we utilize 723 556 photometrically determined LRGs between 0.45 < z < 0.65 in a 3.3 (Gpc h−1)3 spherical harmonic analysis of the galaxy distribution. By combining four photometric redshift bins, we find preliminary parameter constraints of fb≡Ωbm= 0.173 ± 0.046 and Ωm= 0.260 ± 0.035 assuming H0= 75 km s−1 Mpc−1, ns= 1 and Ωk= 0. These limits are consistent with the cosmic microwave background and the previous data release (DR4). The C are sensitive to redshift space distortions and therefore we also recast our constraints into a measurement of β≈Ω0.55m/b in different redshift shells. The robustness of these power spectra with respect to a number of potential systematics such as extinction, photometric redshift and ANNz training set extrapolation are examined. The latter includes a cosmological comparison of available photometric redshift estimation codes where we find excellent agreement between template and empirical estimation methods. MegaZ DR7 represents a methodological prototype to next generation surveys such as the Dark Energy Survey and, furthermore, is a photometric precursor to the spectroscopic BOSS survey. Our galaxy catalogue and all power spectra data can be found at

Keywords: cosmological parameters; dark energy; large-scale structure of Universe

Journal Article.  10018 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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