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Title: The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measurements of the growth of structure and expansion rate at z = 0.57 from anisotropic clustering
Author: Reid, Beth
Samushia, Lado
White, M.
Percival, W.J.
Manera, Marc
Padmanabhan, Nikhil
Ross, Ashley J.
Sanchez, Ariel G.
Bailey, Stephen
Bizyaev, Dimitry
Bolton, Adam S.
Brewington, Howard
Brinkmann, Jon
Brownstein, Joel R.
Cuesta, Antonio J.
Eisenstein, Daniel J.
Gunn, James E.
Honscheid, Klaus
Malanushenko, Elena
Malanushenko, Viktor
Maraston, Claudia
McBride, Cameron K.
Muna, D.
Nichol, Robert C.
Oravetz, Dan
Pan, Kaike
de Putter, Roland
Roe, Natalie A.
Ross, Nicholas P.
Schlegel, D.J.
Schneider, D.P.
Seo, Hee-Jong
Shelden Bradley, Alaina
Sheldon, Erin S.
Simmons, Audrey
Skibba, R.
Snedden, Stephanie
Swanson, Molly E.C.
Thomas, D.
Verde, Licia
Keywords: Galàxies
Observacions astronòmiques
Mesurament de les distàncies
Astronomical observations
Measurement of distances
Issue Date: 8-Jan-2013
Publisher: Royal Astronomical Society
Abstract: We analyse the anisotropic clustering of massive galaxies from the Sloan Digital Sky Survey III Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 9 (DR9) sample, which consists of 264 283 galaxies in the redshift range 0.43 < z < 0.7 spanning 3275 deg2. Both peculiar velocities and errors in the assumed redshift-distance relation ('Alcock-Paczynski effect') generate correlations between clustering amplitude and orientation with respect to the line of sight. Together with the sharp baryon acoustic oscillation (BAO) standard ruler, our measurements of the broad-band shape of the monopole and quadrupole correlation functions simultaneously constrain the comoving angular diameter distance (2190 ± 61 Mpc) to z = 0.57, the Hubble expansion rate at z = 0.57 (92.4 ± 4.5 km s-1 Mpc-1) and the growth rate of structure at that same redshift (dsigma8/d ln a = 0.43 ± 0.069). Our analysis provides the best current direct determination of both DA and H in galaxy clustering data using this technique. If we further assume a Lambdacold dark matter expansion history, our growth constraint tightens to dsigma8/d ln a = 0.415 ± 0.034. In combination with the cosmic microwave background, our measurements of DA, H and dsigma8/d ln a all separately require dark energy at z > 0.57, and when combined imply OmegaLambda = 0.74 ± 0.016, independent of the Universe's evolution at z < 0.57. All of these constraints assume scale-independent linear growth, and assume general relativity to compute both O(10 per cent) non-linear model corrections and our errors. In our companion paper, Samushia et al., we explore further cosmological implications of these observations.
Note: Reproducció del document publicat a:
It is part of: Monthly Notices of the Royal Astronomical Society, 2013, vol. 426, num. 4, p. 2719-2737
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ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Institut de Biomedicina (IBUB))
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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