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Angular correlation function of 1.5 million LRGs: clustering evolution and a search for BAO | | U. Sawangwit
; T. Shanks
; F.B. Abdalla
; R.D. Cannon
; S.M. Croom
; A.C. Edge
; Nicholas P. Ross
; D.A. Wake
; | | Date: |
2 Dec 2009 | | Abstract: | We present the angular correlation function measured from photometric samples
comprising 1562800 LRGs. Three LRG samples were extracted from the SDSS imaging
data, based on colour-cut selections at z 0.35, 0.55 and 0.7 as calibrated by
the spectroscopic surveys, SDSS-LRG, 2SLAQ, and the AAOmega LRG survey. The
intermediate scale correlation functions show significant deviations from a
single power-law fit with a break at ~1Mpc. For r=1-20Mpc and at fixed
luminosity, we see virtually no evolution of the clustering with redshift and
the data is consistent with a simple high peaks biasing model where the
comoving LRG space density is constant with z. At fixed z, the LRG clustering
amplitude increases with luminosity in accordance with the simple high peaks
model, with a typical LRG dark matter halo mass > 10^13 Msun. For r < 1Mpc, the
clustering evolution is faster and consistent with a virialised clustering
model. Again this result is consistent with a model where the space density is
constant with redshift. At large scales, our highest S/N combined w(theta)
result, in its raw form, shows an apparent peak in reasonable agreement with
the acoustic peak detected by Eisenstein et al. However, this feature does not
scale with depth in the expected manner. Furthermore, when corrections for
possible systematics are taken into account the correlation function may not be
consistent with as high amplitude a peak as claimed by Eisenstein et al. This
conclusion is strongly supported by independent angular power-spectral analyses
of similar LRG samples. The w(theta) shape may then still be consistent with
what is expected from the linear structure growth of a scale-invariant spectrum
of initial perturbations, perhaps including a lower amplitude acoustic peak. | | Source: | arXiv, 0912.0511 | | Services: | Forum | Review | PDF | Favorites | |
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