Progress Toward the Dark Energy Survey

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The Dark Energy Survey (DES) utilizes an extremely red-sensitive 500 megapixel camera that will be mounted at the prime focus of the Blanco Telescope at Cerro-Tololo Interamerican Observatory. In survey mode ( 30% of the duty cycle), DES will obtain high precision multi-bandpass observations over 5000 sq. degrees near the South Galactic Pole. The goal is to extract information on the dark energy equation of state, w(t), from four distinct analyses:
1) Cluster counting and spatial distribution of clusters at 0.1 < z < 1.3
2) Determination of the galaxy angular power spectrum as a function of z
3) Weak lensing measurements in redshift shells to z 1
4) Time-series observations of 2000 supernovae at 0.3 < z < 0.8
In May of 2008 the DECam project to build the DES instrument was baselined and approved for construction start; it is scheduled to begin science observations during the 2011 observing season. We report here on the recent progress in realizing the design of the DECam instrument, and discuss the current simulation and observational efforts that bear on the expected results of the Dark Energy Survey.

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