The clustering of the SDSS DR7 main Galaxy sample - I. A 4 per cent distance measure at z=0.15

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Show simple item record Ross, A. J. Samushia, Lado Howlett, C. Percival, W. J. Burden, A. Manera, M. 2016-04-06T15:11:42Z 2016-04-06T15:11:42Z
dc.description Citation: Ross, A. J., Samushia, L., Howlett, C., Percival, W. J., Burden, A., & Manera, M. (2015). The clustering of the SDSS DR7 main Galaxy sample - I. A 4 per cent distance measure at z=0.15. Monthly Notices of the Royal Astronomical Society, 449(1), 835-847. doi:10.1093/mnras/stv154
dc.description We create a sample of spectroscopically identified galaxies with z < 0.2 from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7), covering 6813 deg(2). Galaxies are chosen to sample the highest mass haloes, with an effective bias of 1.5, allowing us to construct 1000 mock galaxy catalogues (described in Paper II), which we use to estimate statistical errors and test our methods. We use an estimate of the gravitational potential to 'reconstruct' the linear density fluctuations, enhancing the baryon acoustic oscillation (BAO) signal in the measured correlation function and power spectrum. Fitting to these measurements, we determine D-V(z(eff) = 0.15) = (664 +/- 25)(r(d)/r(d, fid)) Mpc; this is a better than 4 per cent distance measurement. This 'fills the gap' in BAO distance ladder between previously measured local and higher redshift measurements, and affords significant improvement in constraining the properties of dark energy. Combining our measurement with other BAO measurements from Baryon Oscillation Spectroscopic Survey and 6-degree Field Galaxy Redshift Survey galaxy samples provides a 15 per cent improvement in the determination of the equation of state of dark energy and the value of the Hubble parameter at z = 0 (H-0). Our measurement is fully consistent with the Planck results and the Lambda cold dark matter concordance cosmology, but increases the tension between Planck+BAO H-0 determinations and direct H-0 measurements.
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 Ross, A. J.;Samushia, L.;Howlett, C.;Percival, W. J.;Burden, A.;Manera, M. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.subject Cosmology: Observations
dc.subject Distance Scale
dc.subject Baryon Acoustic-Oscillations
dc.subject Digital Sky Survey
dc.subject Probe Wmap
dc.subject Observations
dc.title The clustering of the SDSS DR7 main Galaxy sample - I. A 4 per cent distance measure at z=0.15
dc.type Article 2015
dc.citation.doi 10.1093/mnras/stv154
dc.citation.epage 847
dc.citation.issn 0035-8711
dc.citation.issue 1
dc.citation.jtitle Monthly Notices of the Royal Astronomical Society
dc.citation.spage 835
dc.citation.volume 449
dc.contributor.authoreid lado

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