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29 March 2024
 
  » arxiv » 1509.6386

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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 ;
Date 21 Sep 2015
AbstractWe 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 $z_{ m lowz}=0.32$, and the CMASS sample 777,202 galaxies with an effective redshift of $z_{ m cmass}=0.57$. 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 $sigma_8$ 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 $fsigma_8$, the product of the Hubble constant and the comoving sound horizon at the baryon drag epoch $H(z)r_s(z_d)$, and the angular distance parameter divided by the sound horizon $D_A(z)/r_s(z_d)$. We find $f(z_{ m lowz})sigma_8(z_{ m lowz})=0.394pm0.062$, $D_A(z_{ m lowz})/r_s(z_d)=6.35pm0.19$, $H(z_{ m lowz})r_s(z_d)=(11.41pm 0.56),{10^3 m km}s^{-1}$ for the LOWZ sample, and $f(z_{ m cmass})sigma_8(z_{ m cmass})=0.444pm0.038$, $D_A(z_{ m cmass})/r_s(z_d)=9.42pm0.15$, $H(z_{ m cmass})r_s(z_d)=(13.92 pm 0.44), {10^3 m km}s^{-1}$ 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 $Lambda$CDM values, we find $f(z_{ m lowz})sigma_8(z_{ m lowz})=0.485pm0.044$ and $f(z_{ m cmass})sigma_8(z_{ m cmass})=0.436pm0.022$ for the LOWZ and CMASS samples, respectively.
Source arXiv, 1509.6386
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