Power spectrum of the SDSS luminous red galaxies: constraints on cosmological parameters
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In this article, the authors used the CMB data from the WMAP experiment together with the power spectrum measurement of the SDSS Luminous Red Galaxies (LRGs) to determine the constraints on cosmological parameters.Abstract:
In this paper we determine the constraints on cosmological parameters using the CMB data from the WMAP experiment together with the recent power spectrum measurement of the SDSS Luminous Red Galaxies (LRGs). Specifically, we focus on spatially flat, low matter density models with adiabatic Gaussian initial conditions. The spatial flatness is achieved with an additional quintessence component whose equation of state parameter w_eff is taken to be independent of redshift. Throughout most of the paper we do not allow any massive neutrino contribution and also the influence of the gravitational waves on the CMB is taken to be negligible. The analysis is carried out separately for two cases: (i) using the acoustic scale measurements as presented in Hutsi (2006), (ii) using the full SDSS LRG power spectrum and its covariance matrix. We are able to obtain a very tight constraint on the Hubble constant: H_0 = 70.8 ^{+2.1}_{-2.0} km/s/Mpc, which helps in breaking several degeneracies between the parameters and allows us to determine the low redshift expansion law with much higher accuracy than available from the WMAP + HST data alone. The positive deceleration parameter q_0 is found to be ruled out at 5.5 \sigma confidence level. Finally, we extend our analysis by investigating the effects of relaxing the assumption of spatial flatness and also allow for a contribution from massive neutrinos.read more
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Journal ArticleDOI
The 6dF Galaxy Survey: baryon acoustic oscillations and the local Hubble constant
Florian Beutler,Chris Blake,Matthew Colless,D. Heath Jones,Lister Staveley-Smith,Lachlan Campbell,Quentin A. Parker,Quentin A. Parker,Will Saunders,Fred Watson +9 more
TL;DR: In this article, a large-scale correlation function of the 6dF Galaxy Survey (6dFGS) and detect a baryon acoustic oscillation (BAO) signal at 105h −1 Mpc was analyzed.
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Clustering of luminous red galaxies – IV. Baryon acoustic peak in the line-of-sight direction and a direct measurement of H(z)
TL;DR: In this article, a two-point correlation function is estimated as a function of perpendicular σ and line-of-sight π (radial) directions, and significant evidence of a peak along the radial direction whose shape is consistent with its origination from the recombination-epoch baryon acoustic oscillations (BAO).
Journal ArticleDOI
The clustering of luminous red galaxies in the Sloan Digital Sky Survey imaging data
Nikhil Padmanabhan,David J. Schlegel,Uroš Seljak,Uroš Seljak,Alexey Makarov,Neta A. Bahcall,Michael R. Blanton,Jonathan Brinkmann,Daniel J. Eisenstein,Douglas P. Finkbeiner,James E. Gunn,David W. Hogg,Željko Ivezić,Gillian R. Knapp,Jon Loveday,Robert H. Lupton,Robert C. Nichol,Donald P. Schneider,Michael A. Strauss,Max Tegmark,Donald G. York +20 more
TL;DR: The 3D real-space clustering power spectrum of a sample of ∼600 000 luminous red galaxies measured by the Sloan Digital Sky Survey, using photometric redshifts, is presented in this paper.
Journal ArticleDOI
Large-scale anisotropic correlation function of sdss luminous red galaxies
Teppei Okumura,Takahiko Matsubara,Daniel J. Eisenstein,Issha Kayo,Chiaki Hikage,Chiaki Hikage,Alexander S. Szalay,Donald P. Schneider +7 more
TL;DR: In this paper, the authors measured the correlation function as a function of separations parallel and perpendicular to the line of sight in order to take account of anisotropy of the large-scale structure in redshift space.
Journal ArticleDOI
Measuring baryon acoustic oscillations along the line of sight with photometric redshifts: the pau survey
Narciso Benítez,Enrique Gaztanaga,Ramon Miquel,Francisco J. Castander,Mariano Moles,Martin Crocce,Alberto Fernández-Soto,Alberto Fernández-Soto,Pablo Fosalba,Fernando J. Ballesteros,J. Campa,Laia Cardiel-Sas,Javier Castilla,David Cristóbal-Hornillos,M. Delfino,Enrique J. Fernández,C. Fernandez-Sopuerta,Juan Garcia-Bellido,J. A. Lobo,Vicent J. Martínez,Antonio Gómez Ortiz,A. Pacheco,Silvestre Paredes,Silvestre Paredes,M. J. Pons-Bordería,M. J. Pons-Bordería,E. J. Sanchez,Sebastián F. Sánchez,Jesús A. Varela,J. de Vicente +29 more
TL;DR: In this article, it was shown that a much better precision is sufficient to obtain photometric redshifts with enough precision (? z ) to measure BAOs along the line of sight, while a much worse precision will result in the effective loss of the radial information.
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