DEUS/CLAUDS surveys
DEUS is a large area (10 sq deg) very deep (u~27AB at SNR=5) u-band imaging survey in the Euclid Deep Field North. DEUS (which stands for Deep Euclid U-band Survey) observations are in an area of the sky that is getting very deep Euclid imaging and spectroscopy and which already contains amazing ultra-deep ancillary data, including optical imaging from Subaru/HSC and IR imaging from Spitzer/IRAC. This is going to be a truly unprecedented dataset in terms of depth, area, and wavelength coverage. The photo-z’s that the DEUS u-band imaging will enable will allow us to trace the Cosmic Web skeleton out to redshift z~3, and then study how galaxy evolution depends on a galaxy’s location in this filamentary cosmic structure. Moreover, in addition to superb photometry and Euclid imaging, Euclid slitless grism spectroscopy will let us study galaxies in a way that’s similar to what we are doing with NIRISS on JWST but over much larger areas of the sky.
DEUS builds on CFHT Large Area U-band Deep Survey (CLAUDS), which is a very deep U-band imaging survey that overlaps with the Subaru Hyper Suprime-Cam (HSC) survey Deep/UltraDeep fields. The CLAUDS data (68 dedicated CFHT dark-time nights plus archival data) are all in hand, as are the Subaru observations. We are using these joint catalogs for a large range of scientific applications, from detailed galaxy evolutions studies over 0<z<1, to assembling large samples of galaxies, quasars and proto-clusters at z~2-3. We are working on many of these topics, and have published over 20 papers on them already, with many more in preparation.
