The 2dF-SDSS LRG and QSO Survey: evolution of the clustering of luminous red galaxies since z=0.6

Wake, David A., Sheth, Ravi K., Nichol, Robert C., Baugh, Carlton M., Bland-Hawthorn, Joss, Colless, Matthew, Couch, Warrick J., Croom, Scott M., De Propris, Roberto, Drinkwater, Michael J., Edge, Alastair C., Loveday, Jon, Lam, Tsz Yan, Pimbblet, Kevin A., Roseboom, Isaac G., Ross, Nicholas P., Schneider, Donald P., Shanks, Tom and Sharp, Robert G. (2008) The 2dF-SDSS LRG and QSO Survey: evolution of the clustering of luminous red galaxies since z=0.6. Monthly Notices of Royal Astronomical Society, 387 3: 1045-1062. doi:10.1111/j.1365-2966.2008.13333.x

Author Wake, David A.
Sheth, Ravi K.
Nichol, Robert C.
Baugh, Carlton M.
Bland-Hawthorn, Joss
Colless, Matthew
Couch, Warrick J.
Croom, Scott M.
De Propris, Roberto
Drinkwater, Michael J.
Edge, Alastair C.
Loveday, Jon
Lam, Tsz Yan
Pimbblet, Kevin A.
Roseboom, Isaac G.
Ross, Nicholas P.
Schneider, Donald P.
Shanks, Tom
Sharp, Robert G.
Title The 2dF-SDSS LRG and QSO Survey: evolution of the clustering of luminous red galaxies since z=0.6
Formatted title
The 2dF-SDSS LRG and QSO Survey: evolution of the clustering of luminous red galaxies since z = 0.6
Journal name Monthly Notices of Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2008-07
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2008.13333.x
Open Access Status DOI
Volume 387
Issue 3
Start page 1045
End page 1062
Total pages 18
Editor R.F. Carswell
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2009
Language eng
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 (SDSS) and the 2dF-SDSS LRG and QSO Survey (2SLAQ) survey carefully matched to have the same rest-frame colours and luminosity. We study the spatial two-point autocorrelation function in both redshift space [ξ(s)] and real space [ξ(r)] of a combined sample of over 10 000 LRGs, which represent the most massive galaxies in the universe with stellar masses >1011 h−1 M⊙ and space densities ≃10−4 h3 Mpc−3 . We find no significant evolution in the amplitude (r0) of the correlation function with redshift, but do see a slight decrease in the slope (γ) 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 per cent 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 per cent from z= 0.55 to 0.19 (i.e. an average rate of 2.4 per cent 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. When combined with measurements of the luminosity function, our results suggest that this scatter is sub-Poisson. While this is a generic prediction of hierarchical models, it has not been tested before.
Keyword surveys
elliptical and lenticular, cD
galaxies: evolution
galaxies: haloes
cosmology: observations
large-scale structure of Universe
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Published Online: 30 May 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
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Created: Wed, 25 Mar 2009, 15:15:52 EST by Jo Hughes on behalf of School of Mathematics & Physics