Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21721406c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #214.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We highlight some of our recent results looking at using Luminous Red Galaxies (LRGs) as cosmic chronometers. LRGs provide a potentially promising method for measuring the cosmic expansion of the Universe by accurately age dating these passively evolving galaxies. However, the measurement of H(z) is limited by the accuracy and precision in the ages of the LRGs. In our recent work, we quantify the uncertainties on the measurement of H(z) by examining LRG populations in numerical simulations. From the simulated star formation histories for LRGs, we find that single stellar populations can not provide the accuracy required to measure H(z) at intermediate redshifts. However, we find that we are able to recover H(z) to within 3 per cent at z 0.42 by: (1) age dating the LRGs using extended star formation histories that realistically replicate those predicted in the simulations, and (2) selecting a homogeneous sample of LRGs that are not affected by late bursts of star formation. We present a observing program optimized for the Southern African Large Telescope to perform such a measurement. Finally, we present some initial results on age dating LRGs from existing surveys along with a comparison of different techniques to determine the ages. This work was supported by the National Research Foundation of South Africa.
Blyth S.
Crawford Steven M.
Cress Catherine
der Heyden Kurt van
Olivier Enrico A.
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