Papers › The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies

The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies

8 Apr 2016arXiv:1604.02350links table onlyarchive 2025-07-28

C. Laigle, H. J. McCracken, O. Ilbert, B. C. Hsieh, I. Davidzon, P. Capak, G. Hasinger, J. D. Silverman, C. Pichon, J. Coupon, H. Aussel, D. Le Borgne, K. Caputi, P. Cassata, Y. -Y. Chang, F. Civano, J. Dunlop, J. Fynbo, J. S. kartaltepe, A. Koekemoer, O. Le Fevre, E. Le Floc'h, A. Leauthaud, S. Lilly, L. Lin, S. Marchesi, B. Milvang-Jensen, M. Salvato, D. B. Sanders, N. Scoville, V. Smolcic, M. Stockmann, Y. Taniguchi, L. Tasca, S. Toft, M. Vaccari, J. Zabl

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We present the COSMOS2015 catalog which contains precise photometric redshifts and stellar masses for more than half a million objects over the 2deg² COSMOS field. Including new YJHKₛ images from the UltraVISTA-DR2 survey, Y-band from Subaru/Hyper-Suprime-Cam and infrared data from the Spitzer Large Area Survey with the Hyper-Suprime-Cam Spitzer legacy program, this near-infrared-selected catalog is highly optimized for the study of galaxy evolution and environments in the early Universe. To maximise catalog completeness for bluer objects and at higher redshifts, objects have been detected on a χ² sum of the YJHKₛ and z⁺⁺ images. The catalog contains ∼6×10⁵ objects in the 1.5 deg² UltraVISTA-DR2 region, and ∼1.5×10⁵ objects are detected in the "ultra-deep stripes" (0.62 deg²) at Kₛ≤24.7 (3σ, 3", AB magnitude). Through a comparison with the zCOSMOS-bright spectroscopic redshifts, we measure a photometric redshift precision of σ_(Δz/(1+zₛ)) = 0.007 and a catastrophic failure fraction of η=0.5%. At 3<z<6, using the unique database of spectroscopic redshifts in COSMOS, we find σ_(Δz/(1+zₛ)) = 0.021 and η=13.2%. The deepest regions reach a 90\% completeness limit of 10¹⁰M_⊙ to z=4. Detailed comparisons of the color distributions, number counts, and clustering show excellent agreement with the literature in the same mass ranges. COSMOS2015 represents a unique, publicly available, valuable resource with which to investigate the evolution of galaxies within their environment back to the earliest stages of the history of the Universe. The COSMOS2015 catalog is distributed via anonymous ftp (ftp://ftp.iap.fr/pub/from_users/hjmcc/COSMOS2015/) and through the usual astronomical archive systems (CDS, ESO Phase 3, IRSA).

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