Cosmological baryonic and matter densities from 600 000 SDSS luminous red galaxies with photometric redshifts

By C. Blake, Adrian Collister, Sarah Bridle, Ofer Lahav. 2006

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We analyse MegaZ-LRG, a photometric-redshift catalogue of luminous red galaxies (LRGs) based on the imaging data of the Sloan Digital Sky Survey (SDSS) 4th Data Release. MegaZ-LRG, presented in a companion paper, contains > 10(6) photometric redshifts derived with ANNZ, an artificial neural network method, constrained by a spectroscopic subsample of approximate to 13 000 galaxies obtained by the 2dF-SDSS LRG and Quasar (2SLAQ) survey. The catalogue spans the redshift range 0.4 < z < 0.7 with an rms redshift error sigma(z) approximate to 0.03(1 + z), covering 5914 deg(2) to map out a total cosmic volume 2.5 h(-3) Gpc(3). In this study we use the most reliable 600 000 photometric redshifts to measure the large-scale structure using two methods: (1) a spherical harmonic analysis in redshift slices, and (2) a direct re-construction of the spatial clustering pattern using Fourier techniques. We present the first cosmological parameter fits to galaxy angular power spectra from a photometric-redshift survey. Combining the redshift slices with appropriate covariances, we determine best-fitting values for the matter density Omega(m) and baryon density Omega(b) of Omega(m)h = 0.195 +/- 0.023 and Omega(b)/Omega(m) = 0.16 +/- 0.036 (with the Hubble parameter h = 0.75 and scalar index of primordial fluctuations n(scalar) = 1 held fixed). These results are in agreement with and independent of the latest studies of the cosmic microwave background radiation, and their precision is comparable to analyses of contemporary spectroscopic-redshift surveys. We perform an extensive series of tests which conclude that our power spectrum measurements are robust against potential systematic photometric errors in the catalogue. We conclude that photometric-redshift surveys are competitive with spectroscopic surveys for measuring cosmological parameters in the simplest 'vanilla' models. Future deep imaging surveys have great potential for further improvement, provided that systematic errors can be controlled.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/1ec3216722fc0ebcfad5b2b306f6bc189b59ca16

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Citations in the corpus

Modelling the anisotropic two-point galaxy correlation function on small scales and single-probe measurements of H(z), DA(z) and f(z)σ8(z) from the Sloan Digital Sky Survey DR7 luminous red galaxies (2012, methodology): “The SDSS data have been analysed using both the powerspectrum method (see e.g. Tegmark et al. 2004; Hutsi 2005; Blake et al. 2007; Padmanabhan et al. 2007; Percival et al. 2007, 2010; Reid et al. 2010; Montesano, Sanchez & Phleps 2012) and the correlation function method (see e.g. Eisenstein et al.…”
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): “The BAO feature has also been detected in imaging data sets using photometric redshifts (Padmanabhan et al. 2007; Blake et al. 2007; Seo et al. 2012) and in galaxy cluster samples1 (Hütsi 2010).”
Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample (2009, methodology): “Two studies have also considered the clustering of the LRGs at high redshift within the SDSS survey, using photometric redshifts to estimate galaxy distances (Blake et al. 2007; Padmanabhan et al. 2007).”
Cosmological parameter constraints from SDSS luminous red galaxies: a new treatment of large-scale clustering (2009, background): “The assumptions behind the model in equation (A5), one could argue, are over-simplifications, particularly for biased tracers such as LRGs (Zehavi et al. 2005; Blake et al. 2007), or for deeper surveys where a more systematic derivation of redshift distortions may be needed.”
Cosmological constraints from the clustering of the Sloan Digital Sky Survey DR7 luminous red galaxies (vol 404, pg 60, 2010) (2009, unknown): “Padmanabhan et al. (2007) find m = 0.30 ± 0.03 for h = 0.7 and ns = 1 and Blake et al. (2007) find mh= 0.195 ± 0.023 for h= 0.75 and ns = 1.”
Measurements of H(z) and DA(z) from the two-dimensional two-point correlation function of Sloan Digital Sky Survey luminous red galaxies (2011, methodology): “The SDSS data have been analyzed using both the power spectrum method (see, e.g., Tegmark et al. 2004; Hutsi 2005; Padmanabhan et al. 2007; Blake et al. 2007; Percival etal.”
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measurements of the growth of structure and expansion rate at z = 0.57 from anisotropic clustering (2012, background): “…al. 2011), the local expansion rate (Riess et al. 2011) and baryon acoustic oscillations (BAO; Cole et al. 2005; Eisenstein et al. 2005; Hütsi 2006; Blake et al. 2007; Padmanabhan et al. 2007; Percival et al. 2007, 2010; Okumura et al. 2008; Gaztanaga, Cabre & Hui 2009; Kazin et al. 2010; Reid…”
A 2 per cent distance to $z$=0.35 by reconstructing baryon acoustic oscillations - I. Methods and application to the Sloan Digital Sky Survey (2012, methodology): “There have now been multiple detections of the BAO feature in galaxy surveys (Cole et al. 2005; Eisenstein et al. 2005; Blake et al. 2007, 2011a,b; Padmanabhan et al. 2007; Percival et al. 2007, 2010; Gaztañaga et al. 2009a; Gaztañaga, Cabré & Hui 2009b; Kazin et al. 2010; Reid et al. 2010;…”
Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample (2010, background): “…alignments consistent with those in SuperCOSMOS, and including photometric redshift errors) is plotted, forzm ≈ 0.5 and assuming bg = 1.9 which is roughly in agreement with the results obtained for the full MegaZ-LRG sample by Blake et al. (2007) and close to the value we determine, see Sect.”
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: single-probe measurements from CMASS anisotropic galaxy clustering (2013, methodology): “…al. 2001) data have been analysed, and the cosmological results delivered, using both the power spectrum (see, e.g. Tegmark et al. 2004; Hutsi 2005; Blake et al. 2007; Padmanabhan et al. 2007; Percival et al. 2007, 2010; Reid et al. 2010; Montesano, Sanchez & Phleps 2012), and the correlation…”
The WiggleZ Dark Energy Survey: testing the cosmological model with baryon acoustic oscillations at z= 0.6 (2011, background): “Currently, intermediate redshifts have only been probed by photometric-redshift surveys which have limited statistical precision (Blake et al. 2007, Padmanabhan et al. 2007).”
The 6dF Galaxy Survey: baryon acoustic oscillations and the local Hubble constant (2011, methodology): “…et al. 2010), the power spectrum P (k) (Cole et al. 2005; Tegmark et al. 2006; Huetsi 2006; Reid et al. 2010), the projected correlation function w(rp) of photometric redshift samples (Padmanabhan et al. 2007; Blake et al. 2007) and a cluster sample based on the SDSS photometric data (Huetsi 2009).”
Observational probes of cosmic acceleration (2012, background): “…a good measurement of w(z = 0.5) but still only loose constraints on wa. Indications of the acoustic feature have also been found in a sample of higher redshift LRG with photometric redshifts from the SDSS (Padmanabhan et al., 2007; Blake et al., 2007; Crocce et al., 2011; Sawangwit et al., 2011).”
An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data (2007, background): “The first such measurements of clustering on gigaparsec scales and larger were recently reported (Padmanabh et al. 2007; Blake et al. 2007).”
The clustering of galaxies in the sdss-iii baryon oscillation spectroscopic survey: Baryon acoustic oscillations in the data release 9 spectroscopic galaxy sample (2012, background): “…the evolved density field (Percival et al. 2001, 2007c, 2010; Miller, Nichol & Batuski 2001; Eisenstein et al. 2005; Cole et al. 2005; Hütsi 2006; Blake et al. 2007, 2011a; Padmanabhan et al. 2007, 2012a; Okumura et al. 2008; Gaztanaga, Cabre & Hui 2009; Sanchez et al. 2009; Kazin et al. 2010;…”
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: single-probe measurements and the strong power of f(z)σ8(z) on constraining dark energy (2013, methodology): “…and the cosmological results delivered, using both the power spectrum (see, e.g., Tegmark et al. 2004; Hutsi 2005; Padmanabhan et al. 2007; Blake et al. 2007; Percival et al. 2007, 2010; Reid et al. 2010; Montesano et al. 2011), and the correlation function method (see, e.g., Eisenstein…”
Clustering of luminous red galaxies – IV. Baryon acoustic peak in the line-of-sight direction and a direct measurement of H(z) (2008, background): “Photometric LRG catalogs cover a larger volume and larger densities and have also been used to obtain cosmological constraints (Padmanabhan et al. 2007; Blake et al. 2007).”