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28 March 2024
 
  » arxiv » arxiv.0704.3739

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Luminous Red Galaxy Clustering at z ~ 0.7 - First Results using AAOmega
Nicholas P. Ross ; T. Shanks ; Russell D. Cannon ; D.A. Wake ; R.G. Sharp ; S.M. Croom ; John A. Peacock ;
Date 27 Apr 2007
Subject Astrophysics (astro-ph)
AbstractWe report on the AAOmega-AAT LRG Pilot observing run to establish the feasibility of a large spectroscopic survey using the new AAOmega instrument. We have selected Luminous Red Galaxies (LRGs) using single epoch SDSS riz-photometry to i<20.5 and z<20.2. We have observed in 3 fields including the COSMOS field and the COMBO-17 S11 field, obtaining a sample of ~600 redshift z>=0.5 LRGs. Exposure times varied from 1 - 4 hours to determine the minimum exposure for AAOmega to make an essentially complete LRG redshift survey in average conditions. We show that LRG redshifts to i<20.5 can be measured in 1.5hr exposures and present comparisons to spectroscopic and photometric redshifts obtained by the 2SLAQ LRG and COMBO-17 surveys respectively. Crucially, the riz selection coupled with the 3-4 times improved AAOmega throughput is shown to extend the LRG mean redshift from z=0.55 for 2SLAQ to z=0.681+/- 0.005 for riz-selected LRGs. This extended range is vital for maximising the S/N for the detection of the baryon acoustic oscillations (BAOs). Furthermore, we show that the amplitude of LRG clustering is s_0 = 9.9+/-0.3 h^-1 Mpc, as high as that seen in the 2SLAQ LRG Survey. Consistent results for the real-space amplitude are found from projected and semi-projected correlation functions. This high clustering amplitude is consistent with a long-lived population whose bias evolves as predicted by a simple ``high-peaks’’ model. We conclude that a redshift survey of 360 000 LRGs over 3000deg^2 is possible with AAOmega in 170 nights. To reach the same BAO S/N, the WiggleZ ELG Survey will require 1.7 times as much AAT time.
Source arXiv, arxiv.0704.3739
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