The COSMOS2015 Catalog: Exploring the 1 <z <6 Universe with Half a Million Galaxies

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. KoekemoerO. Le Fèvre, 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, Mattia Vaccari, J. Zabl

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We present the COSMOS201524 catalog, which contains precisephotometric redshifts and stellar masses for more than half a millionobjects over the 2deg2 COSMOS field. Including new{{YJHK}}{{s}} images from the UltraVISTA-DR2 survey, Y-bandimages from Subaru/Hyper-Suprime-Cam, and infrared data from the SpitzerLarge Area Survey with the Hyper-Suprime-Cam Spitzer legacy program,this near-infrared-selected catalog is highly optimized for the study ofgalaxy evolution and environments in the early universe. To maximizecatalog completeness for bluer objects and at higher redshifts, objectshave been detected on a χ 2 sum of the{{YJHK}}{{s}} and z ++ images. The catalogcontains ∼ 6× {10}5 objects in the 1.5deg2 UltraVISTA-DR2 region and ∼ 1.5×{10}5 objects are detected in the “ultra-deepstripes” (0.62 deg2) at {K}{{s}}≤slant24.7 (3σ, 3″, AB magnitude). Through a comparison with thezCOSMOS-bright spectroscopic redshifts, we measure a photometricredshift precision of {σ }{{Δ}z/(1+{z}s)} = 0.007 and a catastrophic failurefraction of η = 0.5%. At 3\lt z\lt 6, using the unique database ofspectroscopic redshifts in COSMOS, we find {σ }{{Δ}z/(1+{z}s)} = 0.021 and η = 13.2 % . The deepestregions reach a 90% completeness limit of{10}10{M}ȯ to z = 4. Detailed comparisons ofthe color distributions, number counts, and clustering show excellentagreement with the literature in the same mass ranges. COSMOS2015represents a unique, publicly available, valuable resource with which toinvestigate the evolution of galaxies within their environment back tothe earliest stages of the history of the universe. The COSMOS2015catalog is distributed via anonymous ftp and through the usualastronomical archive systems (CDS, ESO Phase 3, IRSA).
Original languageEnglish
Article number24
JournalAstrophysical Journal Supplement
Issue number2
Publication statusPublished - 8 Jun 2016

Keywords / Materials (for Non-textual outputs)

  • catalogs
  • galaxies: evolution
  • galaxies: high-redshift
  • galaxies: photometry
  • methods: observational
  • techniques: photometric


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