Cosmology and the halo occupation distribution from small-scale galaxy clustering in the sloan digital sky survey

Kevork Abazajian, Zheng Zheng, Idit Zehavi, David H. Weinberg, Joshua A. Frieman, Andreas A. Berlind, Michael R. Blanton, Neta A. Bahcall, J. Brinkmann, Donald P. Schneider, Max Tegmark

    Research output: Contribution to journalArticle

    Abstract

    We use the projected correlation function wp(rp) of a volume-limited subsample of the Sloan Digital Sky Survey (SDSS) main galaxy-redshift catalog to measure the halo occupation distribution (HOD) of the galaxies of the sample. Simultaneously, we allow the cosmology to vary within cosmological constraints imposed by cosmic microwave background experiments in a ACDM model. We find that combining wp(rp) for this sample alone with observations by the Wilkinson Microwave Anisotropy Probe (WMAP), Arcminute Cosmology Bolometer Array Receiver (ACBAR), Cosmic Background Imager (CBI), and Very Small Array ( VSA) can provide one of the most precise techniques available to measure cosmological parameters. For a minimal, flat, six-parameter ACDM model with an HOD with three free parameters, we find Ωm = 0.278-0.027 +0.027, σ8 = 0.812 -0.027 +0.028, and H0 = 69.8-2.6 +2.6 km s-1 Mpc-1 ; these errors are significantly smaller than from cosmic microwave background (CMB) alone and similar to those obtained by combining CMB with the large-scale galaxy power spectrum assuming scale-independent bias. The corresponding HOD parameters describing the minimum halo mass and the normalization and cutoff of the satellite mean occupation are Mmin = (3.03-0.36 +0.36)x 1012 h-lM⊙, M1 = (4.58 -0.60 +0.60)xl013 h-l M⊙, and k = 4.44-0.69 +0.51. These HOD parameters thus have small fractional uncertainty when cosmological parameters are allowed to vary within the range permitted by the data. When more parameters are added to the HOD model, the error bars on the HOD parameters increase because of degeneracies, but the error bars on the cosmological parameters do not increase greatly. Similar modeling for other galaxy samples could reduce the statistical errors on these results, while more thorough investigations of the cosmology dependence of nonlinear halo bias and halo mass functions are needed to eliminate remaining systematic uncertainties, which may be comparable to statistical uncertainties.

    Original languageEnglish (US)
    Pages (from-to)613-620
    Number of pages8
    JournalAstrophysical Journal
    Volume625
    Issue number2 I
    DOIs
    StatePublished - Jun 1 2005

    Fingerprint

    cosmology
    occupation
    halos
    galaxies
    microwaves
    distribution
    parameter
    Microwave Anisotropy Probe
    bolometers
    catalogs
    power spectra
    anisotropy
    cut-off
    receivers
    probe
    microwave

    Keywords

    • Cosmology: observations
    • Cosmology: theory
    • Galaxies: formation
    • Galaxies: halos

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Abazajian, K., Zheng, Z., Zehavi, I., Weinberg, D. H., Frieman, J. A., Berlind, A. A., ... Tegmark, M. (2005). Cosmology and the halo occupation distribution from small-scale galaxy clustering in the sloan digital sky survey. Astrophysical Journal, 625(2 I), 613-620. https://doi.org/10.1086/429685

    Cosmology and the halo occupation distribution from small-scale galaxy clustering in the sloan digital sky survey. / Abazajian, Kevork; Zheng, Zheng; Zehavi, Idit; Weinberg, David H.; Frieman, Joshua A.; Berlind, Andreas A.; Blanton, Michael R.; Bahcall, Neta A.; Brinkmann, J.; Schneider, Donald P.; Tegmark, Max.

    In: Astrophysical Journal, Vol. 625, No. 2 I, 01.06.2005, p. 613-620.

    Research output: Contribution to journalArticle

    Abazajian, K, Zheng, Z, Zehavi, I, Weinberg, DH, Frieman, JA, Berlind, AA, Blanton, MR, Bahcall, NA, Brinkmann, J, Schneider, DP & Tegmark, M 2005, 'Cosmology and the halo occupation distribution from small-scale galaxy clustering in the sloan digital sky survey', Astrophysical Journal, vol. 625, no. 2 I, pp. 613-620. https://doi.org/10.1086/429685
    Abazajian, Kevork ; Zheng, Zheng ; Zehavi, Idit ; Weinberg, David H. ; Frieman, Joshua A. ; Berlind, Andreas A. ; Blanton, Michael R. ; Bahcall, Neta A. ; Brinkmann, J. ; Schneider, Donald P. ; Tegmark, Max. / Cosmology and the halo occupation distribution from small-scale galaxy clustering in the sloan digital sky survey. In: Astrophysical Journal. 2005 ; Vol. 625, No. 2 I. pp. 613-620.
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    AU - Zheng, Zheng

    AU - Zehavi, Idit

    AU - Weinberg, David H.

    AU - Frieman, Joshua A.

    AU - Berlind, Andreas A.

    AU - Blanton, Michael R.

    AU - Bahcall, Neta A.

    AU - Brinkmann, J.

    AU - Schneider, Donald P.

    AU - Tegmark, Max

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