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

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 $z_{\mathrm{lowz}}=0.32$, and the CMASS sample 777\,202 galaxies with an effective redshift of $z_{\mathrm{cmass}}=0.57$. 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 $f{\sigma }_8$, 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 $f(z_{\mathrm{lowz}}){\sigma }_8(z_{\mathrm{lowz}})=0.394\pm 0.062$, $D_A(z_{\mathrm{lowz}})/r_s(z_d)=6.35\pm 0.19$, $H(z_{\mathrm{lowz}})r_s(z_d)=(11.41\pm 0.56)10^3\mathrm{km}{s}^{-1}$ for the LOWZ sample, and $f(z_{\mathrm{cmass}}){\sigma }_8(z_{\mathrm{cmass}})=0.444\pm 0.038$, $D_A(z_{\mathrm{cmass}})/r_s(z_d)=9.42\pm 0.15$, $H(z_{\mathrm{cmass}})r_s(z_d)=(13.92\pm 0.44)10^3\mathrm{km}{s}^{-1}$ 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 $f(z_{\mathrm{lowz}}){\sigma }_8(z_{\mathrm{lowz}})=0.485\pm 0.044$ and $f(z_{\mathrm{cmass}}){\sigma }_8(z_{\mathrm{cmass}})=0.436\pm 0.022$ for the LOWZ and CMASS samples, respectively.

24 pages, 15 figures. Accepted for publication in MNRAS

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