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Research at St Andrews

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

Research output: Contribution to journalArticle

Author(s)

R. Tojeiro, W. J. Percival, J. Brinkmann, J. R. Brownstein, D. J. Eisenstein, M. Manera, C. Maraston, C. K. McBride, D. Muna, B. Reid, A. J. Ross, N. P. Ross, L. Samushia, N. Padmanabhan, D. P. Schneider, R. Skibba, A. G. Sánchez, M. E. C. Swanson, D. Thomas, J. L. Tinker & 4 more L. Verde, D. A. Wake, B. A. Weaver, G.-B. Zhao

School/Research organisations

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.
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Details

Original languageEnglish
Pages (from-to)2339-2344
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume424
Issue number3
Early online date11 Aug 2012
DOIs
Publication statusPublished - 11 Aug 2012

    Research areas

  • Surveys, Cosmology: observations, Dark energy, Large-scale structure of Universe

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