Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924805r&link_type=abstract
American Astronomical Society, AAS Meeting #219, #248.05
Astronomy and Astrophysics
Astronomy
Scientific paper
The Dark Energy Survey will observe 5000 square degrees of sky and obtain photometric redshifts and precise shapes for 300 million galaxies. This will enable us to measure the dark energy equation of state to a few per cent level accuracy from each of a range of cosmic probes: weak gravitational lensing, galaxy clustering, supernovae and cluster counts. In this poster I focus on the correlated weak lensing signal found in random patches of the sky, often termed cosmic shear. This effect will typically distort a circular galaxy into an ellipse with a major to minor axis ratio of around 1.05. To measure the dark energy equation of state to per cent level precision, these quantities must be must be measured to an accuracy better than 0.002.
However, this measurement must also be performed in the presence of atmospheric blurring and telescope effects, which cause additional distortions of major to minor axis ratio 1.01 or larger. I describe research in the Dark Energy Survey Weak Lensing Working Group to develop methods to take these effects into account, accurately uncover the cosmic shear, and thus measure the dark energy equation of state.
DES
Rowe Barnaby T.
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