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The 2dF-SDSS LRG and QSO survey: Evolution of the clustering of Luminous Red Galaxies since z = 0.6 | | David A. Wake
; Ravi K. Sheth
; Robert C. Nichol
; Carlton M. Baugh
; Joss Bland-Hawthorn
; Russell Cannon
; Matthew Colless
; Warrick J. Couch
; Scott M. Croom
; Roberto De Propris
; Michael J. Drinkwater
; Alastair C. Edge
; Jon Loveday
; Tsz Yan Lam
; Kevin A. Pimbblet
; Isaac G. Roseboom
; Nicholas P. Ross
; Donald P. Schneider
; Tom Shanks
; Robert G. Sharp
; | | Date: |
28 Feb 2008 | | Abstract: | We present an analysis of the small-to-intermediate scale clustering of
samples of Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey and
the 2dF-SDSS LRG and QSO (2SLAQ) survey carefully matched to have the same
rest-frame colours and luminosity. We study the spatial two-point
auto-correlation function in both redshift-space and real-space of a combined
sample of over 10,000 LRGs, which represent the most massive galaxies in the
universe with stellar masses > 10^11 h^-1 M_sun and space densities 10^-4 h^-3
Mpc^-3. We find no significant evolution in the amplitude r_0 of the
correlation function with redshift, but do see a slight decrease in the slope
with increasing redshift over 0.19 < z < 0.55 and scales of 0.32 < r < 32 h^-1
Mpc. We compare our measurements with the predicted evolution of dark matter
clustering and use the halo model to interpret our results. We find that our
clustering measurements are inconsistent (>99.9% significance) with a passive
model whereby the LRGs do not merge with one another; a model with a merger
rate of 7.5 +/- 2.3% from z = 0.55 to z = 0.19 (i.e. an average rate of 2.4%
Gyr^-1) provides a better fit to our observations. Our clustering and number
density measurements are consistent with the hypothesis that the merged LRGs
were originally central galaxies in different haloes which, following the
merger of these haloes, merged to create a single Brightest Cluster Galaxy. In
addition, we show that the small-scale clustering signal constrains the scatter
in halo merger histories, and argue that the present data suggests that this
scatter is sub-Poisson. While this is a generic prediction of hierarchical
models, it has not been tested before. | | Source: | arXiv, 0802.4288 | | Services: | Forum | Review | PDF | Favorites | |
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