Journal Article

The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measuring structure growth using passive galaxies

Rita Tojeiro, Will J. Percival, Jon Brinkmann, Joel R. Brownstein, Daniel J. Eisenstein, Marc Manera, Claudia Maraston, Cameron K. McBride, Demitri Muna, Beth Reid, Ashley J. Ross, Nicholas P. Ross, Lado Samushia, Nikhil Padmanabhan, Donald P. Schneider, Ramin Skibba, Ariel G. Sánchez, Molly E. C. Swanson, Daniel Thomas, Jeremy L. Tinker, Licia Verde, David A. Wake, Benjamin A. Weaver and Gong-Bo Zhao

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 3, pages 2339-2344
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21404.x
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measuring structure growth using passive galaxies

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Abstract

We explore the benefits of using a passively evolving population of galaxies to measure the evolution of the rate of structure growth between z = 0.25 and 0.65 by combining data from the Sloan Digital Sky Survey (SDSS) I/II and SDSS-III surveys. The large-scale linear bias of a population of dynamically passive galaxies, which we select from both surveys, is easily modelled. Knowing the bias evolution breaks degeneracies inherent to other methodologies, and decreases the uncertainty in measurements of the rate of structure growth and the normalization of the galaxy power spectrum by up to a factor of 2. If we translate our measurements into a constraint on σ8(z = 0) assuming a concordance cosmological model and general relativity (GR), we find that using a bias model improves our uncertainty by a factor of nearly 1.5. Our results are consistent with a flat Λ cold dark matter model and with GR.

Keywords: surveys; Cosmology: observations; dark energy – large-scale structure of Universe

Journal Article.  3762 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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