The PAU camera at the WHT
2016
The PAU (Physics of the
Accelerating Universe) project goal is the study of dark energy with a new photometric technique aiming at obtaining photo-z resolution for Luminous Red Galaxies (LRGs) roughly one order of magnitude better than current photometric surveys. To accomplish this, a new large
fieldof
view camera(PAUCam) has been built and commissioned at the
William Herschel Telescope(WHT). With the current WHT corrector, the camera covers ~1 degree diameter
Fieldof
View(FoV). The focal plane consists of 18 2kx4k Hamamatsu fully depleted CCDs, with high quantum efficiency up to 1 μm. To maximize the detector coverage within the FoV, filters are placed in front of the CCD's inside the camera
cryostat(made of carbon fiber material) using a challenging movable tray system. The camera uses a set of 40 narrow band filters ranging from ~4400 to ~8600 angstroms complemented with six standard broad-band filters, ugrizY. Here, we describe the camera and its first commissioning results. The PAU project aims to cover roughly 100
square degreesand to obtain accurate
photometric redshiftsfor galaxies down to i AB ~ 22:5 detecting also galaxies down to i AB ~ 24 with less precision in redshift. With this data set we will obtain competitive constraints in cosmological parameters using both weak lensing and
galaxy clusteringas main observational probes.
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