The Cosmic Dawn Survey consist of a number of observational programs to collect complimentary multiwavelength data in the Euclid Deep and Auxiliary Fields.
The Hawaii Twenty deg2 Survey (H20) (ongoing, https://project.ifa.hawaii.edu/h20/)
H20 is an ultradeep galaxy survey providing griz photometry from Hyper Suprime-Cam on the Subaru 8.2m telescope and u-band photometry from MegaCam on the 3.6m Canada France Hawaii Telescope (CFHT). The survey also provides complementary spectroscopic followup from the Keck telescopes. By its completion, H20 will cover a total of 30 deg2 split evenly over two of the Euclid Deep Fields: the North Ecliptic Pole and Chandra Deep Field South.
The Euclid/WFIRST Spitzer Legacy Survey (SLS) (complete)
SLS is a the largest observational program carried our with the Spitzer Space telescope to date, with 5286 hours of survey time at 3-5 micro-meters in the infrared. Now complete, the observations provide coverage over the 20 deg2 of two of the Euclid Deep Fields (NEP and CDFS).
The Euclid Deep Field South Survey (complete)
DFSS is an ultra-deep survey complenetary to SLS consisting of 687h on the Spitzer Space Telescope to cover the 20 square degrees Euclid Deep Field South.
The 3CR2 Sample (ongoing)
3CR2 is a fully representative spectroscopic sample of galaxies in the Euclid Calibration FIelds (CDFS, VVDS-2h, SXDS, COSMOS, HDF-N, and EGS).
The Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH) (complete)
SPLASH contains existing coverage of the Euclid Calibration fields COSMOS and SXDS with 2,600h of Spitzer Space telescope at 3-5 micro-meters and ~7h per pixel with the Hyper-Suprime-Cam on the Subaru telescope.
Footprints for the available data in the DAWN fields are shown below.
