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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) | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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