Combining the CLAUDS and HSC-SSP surveys

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Abstract
We present the combination of the Canada-France-Hawaii Telescope (CHFT) Large AreaU-bands Deep Survey (CLAUDS) and the Hyper-Suprime-Cam (HSC) Subaru Strategic Program (HSC-SSP) data over their four deep fields. We provide photometric catalogs foru, u*(CFHT-MegaCam),g,r, i, z, andy(Subaru-HSC) bands over ~20 deg2, complemented in two fields by data from the Visible and Infrared Survey Telescope for Astronomy (VISTA) Deep Extragalactic Observations (VIDEO) survey and the UltraVISTA survey, thus extending the wavelength coverage toward near-infrared with VIRCAMY, J, H, andKsobservations over 5.5 deg2. The extraction of the photometry was performed with two different softwares: the HSC pipelinehscPipeand the standard and robustSExtractorsoftware. Photometric redshifts were computed with template-fitting methods using the newPhosphoroscode for thehscPipephotometry and the well-knownLe Pharecode for theSExtractorphotometry. The products of these methods were compared with each other in detail. We assessed their quality using the large spectroscopic sample available in those regions, together with photometry and photometric redshifts from COSMOS2020, the latest version of the Cosmic Evolution Survey catalogs. We find that both photometric data sets are in good agreement inUgrizydown to magnitude ~26, and to magnitude ~24.5 in theYJHKsbands. We achieve good performance for the photometric redshifts, reaching precisions of σNMAD≲ 0.04 down tomi~25, even using only the CLAUDS and HSC bands. At the same magnitude limit, we measured an outlier fraction ofη≲ 10% when using theUgrizybands, and down toη≲ 6% when considering near-infrared data. ThehscPipeplusPhosphorospipeline performs slightly worse in terms of photometric-redshifts precision and outlier fraction than itsSExtractorplusLe Pharecounterpart, which has essentially been tracked down to differences in the photometry. Thus, this work is also a validation of thePhosphoroscode. The photometric catalogs with the data and photometric redshifts from the two pipelines are presented and made publicly available.
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