Angular correlation function of 1.5 million LRGs: clustering evolution and a search for BAO - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: We present the angular correlation function measured from photometric samplescomprising 1,562,800 luminous red galaxies LRGs. Three LRG samples wereextracted from the Sloan Digital Sky Survey SDSS imaging data, based oncolour-cut selections at redshifts, z ~ 0.35, 0.55 and 0.7 as calibrated by thespectroscopic surveys, SDSS-LRG, 2dF-SDSS LRG and QSO 2SLAQ, and the AAOmegaLRG survey. The galaxy samples cover ~7600 s.q.deg of the sky, probing a totalcosmic volume of ~5.5 h^-3} Gpc^3.The small and intermediate scale correlation functions generally showsignificant deviations from a single power-law fit with a well-detected breakat ~1 h^-1 Mpc, consistent with the transition scale between the 1- and 2-haloterms in halo occupation models. For galaxy separations 1-20 h^-1 Mpc and atfixed luminosity, we see virtually no evolution of the clustering with redshiftand the data is consistent with a simple high peaks biasing model where thecomoving LRG space density is constant with z. At fixed z, the LRG clusteringamplitude increases with luminosity in accordance with the simple high peaksmodel, with a typical LRG dark matter halo mass 10^13-10^14 h^-1 M sol. For r <1 h^-1 Mpc, the evolution is slightly faster and the clustering decreasestowards high redshift consistent with a virialised clustering model. However,assuming the HOD and LCDM halo merger frameworks, ~2-3 per cent per Gyr of theLRGs is required to merge in order to explain the small scales clusteringevolution, consistent with previous results abridge.



Autor: U. Sawangwit 1, T. Shanks 1, F.B. Abdalla 2, R.D. Cannon 3, S.M. Croom 4, A.C. Edge 5, Nicholas P. Ross 1,6, D.A. Wake 1,7 1 Univ

Fuente: https://arxiv.org/







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