The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: RSD measurement from the LOS-dependent power spectrum of DR12 BOSS galaxies

Héctor Gil-Marín, Will J. Percival, Joel R. Brownstein, Chia-Hsun Chuang, Jan Niklas Grieb, Shirley Ho, Francisco-Shu Kitaura, Claudia Maraston, Francisco Prada, Sergio Rodríguez-Torres, Ashley J. Ross, Lado Samushia, David J. Schlegel, Daniel Thomas, Jeremy L. Tinker, Gong-Bo Zhao

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Abstract

We measure and analyse the clustering of the Baryon Oscillation Spectroscopic Survey (BOSS) relative to the line-of-sight (LOS), for LOWZ and CMASS galaxy samples drawn from the final Data Release 12 (DR12). The LOWZ sample contains 361\,762 galaxies with an effective redshift of zlowz=0.32, and the CMASS sample 777\,202 galaxies with an effective redshift of zcmass=0.57. From the power spectrum monopole and quadrupole moments around the LOS, we measure the growth of structure parameter f times the amplitude of dark matter density fluctuations σ8 by modeling the Redshift-Space Distortion signal. When the geometrical Alcock-Paczynski effect is also constrained from the same data, we find joint constraints on fσ8, the product of the Hubble constant and the comoving sound horizon at the baryon drag epoch H(z)rs(zd), and the angular distance parameter divided by the sound horizon DA(z)/rs(zd). We find f(zlowz)σ8(zlowz)=0.394±0.062, DA(zlowz)/rs(zd)=6.35±0.19, H(zlowz)rs(zd)=(11.41±0.56)103kms−1 for the LOWZ sample, and f(zcmass)σ8(zcmass)=0.444±0.038, DA(zcmass)/rs(zd)=9.42±0.15, H(zcmass)rs(zd)=(13.92±0.44)103kms−1 for the CMASS sample. We find general agreement with previous BOSS DR11 measurements. Assuming the Hubble parameter and angular distance parameter are fixed at fiducial ΛCDM values, we find f(zlowz)σ8(zlowz)=0.485±0.044 and f(zcmass)σ8(zcmass)=0.436±0.022 for the LOWZ and CMASS samples, respectively.
Original languageEnglish
Pages (from-to)4188-4209
JournalMonthly Notices of the Royal Astronomical Society
Volume460
Issue number4
Early online date29 May 2016
DOIs
Publication statusPublished - 21 Aug 2016

Keywords

  • astro-ph.CO
  • cosmology: theory
  • cosmology: cosmological parameters
  • cosmology: large-scale structure of Universe
  • galaxies: haloes
  • RCUK
  • STFC
  • ST/I001204/1

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