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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 | 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 $z_{
m lowz}=0.32$, 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 | Services: | Forum | Review | PDF | Favorites |
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