Clustering of luminous red galaxies – IV. Baryon acoustic peak in the line-of-sight direction and a direct measurement of H(z)

By Enrique Gaztañaga, Anna Cabré, L. Hui. 2008

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We study the clustering of luminous red galaxies in the latest spectroscopic Sloan Digital Sky Survey data releases (DR), DR6 and DR7, which sample over 1 Gpc 3 h ―3 to z = 0.47. The two-point correlation function ξ(σ, π) is estimated as a function of perpendicular σ and line-of-sight π (radial) directions. We find significant detection of a peak at r ≃ 110 Mpc h ―1 , which shows as a circular ring in the σ―π plane. There is also significant evidence of a peak along the radial direction whose shape is consistent with its origination from the recombination-epoch baryon acoustic oscillations (BAO). A ξ (σ, π) model with no radial BAO peak is disfavoured at 3.2σ, whereas a model with no magnification bias is disfavoured at 2σ. The radial data enable, for the first time, a direct measurement of the Hubble parameter H(z) as a function of redshift. This is independent of earlier BAO measurements which used the spherically averaged (monopole) correlation to constrain an integral of H(z). Using the BAO peak position as a standard ruler in the radial direction, we find H(z = 0.24) = 79.69 ± 2.32 (±1.29) km s ―1 Mpc ―1 for z = 0.15-0.30 and H(z = 0.43) = 86.45 ± 3.27 (±1.69) km s ―1 Mac ―1 for z = 0.40-0.47. The first error is a model-independent statistical estimation and the second accounts for systematics both in the measurements and in the model. For the full sample, z = 0.15-0.47, we find H(z = 0.34) = 83.80 ± 2.96 (±1.59) km s ―1 Mpc ―1 .

Subfields: Astronomy and Astrophysics, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/819c063fdef21548bbc11d541b7d2997ed9166bc

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Citations in the corpus

f(T) teleparallel gravity and cosmology (2015, background): “To update, one can also add the measurement of H(z) obtained in [484] from the age of passively evolving galaxies and in [499] from the radial BAO.”
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measuring DA and H at z = 0.57 from the baryon acoustic peak in the data release 9 spectroscopic galaxy sample (2013, methodology): “Such anisotropic analyses have been performed on SDSS-II data (Okumura et al. 2008; Gaztañaga et al. 2009; Chuang & Wang 2012; Xu et al. 2013).”
The Cardassian expansion revisited: constraints from updated Hubble parameter measurements and type Ia supernova data (2017, background): “…provided by different authors use different values for the rd in clustering measurements, for instance Anderson et al. (2014) take 153.19 Mpc while Gaztanaga et al. (2009) choose 153.3 Mpc, etc. Table 1 shows an updated compilation of OHD accumulating a total of 51 points (other recent…”
Four new observational H(z) data from luminous red galaxies in the Sloan Digital Sky Survey data release seven (2012, methodology): “There are already 21 OHD points got from both differential age method (Jimenez et al., 2003; Simon et al., 2005; Stern et al., 2010; Moresco et al., 2012) and baryon acoustic oscillation (BAO) method (Gaztañaga et al., 2009) .”
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample (2016, methodology): “…of SDSS galaxies with photometric redshifts (Padmanabhan et al. 2007); analyses of anisotropic BAO signals in SDSS-I/II (Okumura et al. 2008; Gaztañaga et al. 2009; Chuang & Wang 2012; Chuang et al. 2013a; Chuang & Wang 2013b); the first BAO measurements at z > 0.5 from the WiggleZ survey…”
The clustering of galaxies in the SDSS‐III Baryon Oscillation Spectroscopic Survey: cosmological implications of the large‐scale two‐point correlation function (2012, background): “…al. (2005) and has been subsequently observed using a variety of datasets and techniques (Hütsi 2006; Padmanabhan et al. 2007; Percival et al. 2007, 2010; Cabré & Gaztañaga 2009; Gaztañaga et al. 2009; Kazin et al. 2010; Beutler et al. 2011; Blake et al. 2011; Ho et al. 2012; Seo et al. 2012).”
Observational probes of cosmic acceleration (2012, methodology): “Gaztañaga et al. (2009) analyzed the correlations of the SDSS LRG sample, considering only pairs very close to the line of sight.”