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Title:
Cosmos Photometric Redshifts with 30-Bands for 2-deg2
Authors:
Ilbert, O.; Capak, P.; Salvato, M.; Aussel, H.; McCracken, H. J.; Sanders, D. B.; Scoville, N.; Kartaltepe, J.; Arnouts, S.; Floc'h, E. Le; Mobasher, B.; Taniguchi, Y.; Lamareille, F.; Leauthaud, A.; Sasaki, S.; Thompson, D.; Zamojski, M.; Zamorani, G.; Bardelli, S.; Bolzonella, M.; Bongiorno, A.; Brusa, M.; Caputi, K. I.; Carollo, C. M.; Contini, T.; Cook, R.; Coppa, G.; Cucciati, O.; de la Torre, S.; de Ravel, L.; Franzetti, P.; Garilli, B.; Hasinger, G.; Iovino, A.; Kampczyk, P.; Kneib, J.-P.; Knobel, C.; Kovac, K.; Le Borgne, J. F.; Le Brun, V.; Fèvre, O. Le; Lilly, S.; Looper, D.; Maier, C.; Mainieri, V.; Mellier, Y.; Mignoli, M.; Murayama, T.; Pellò, R.; Peng, Y.; Pérez-Montero, E.; Renzini, A.; Ricciardelli, E.; Schiminovich, D.; Scodeggio, M.; Shioya, Y.; Silverman, J.; Surace, J.; Tanaka, M.; Tasca, L.; Tresse, L.; Vergani, D.; Zucca, E.
Affiliation:
AA(Institute for Astronomy, 2680 Woodlawn Dr., University of Hawaii, Honolulu, HI 96822, USA ), AB(California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA ; Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA ), AC(California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA ), AD(AIM Unité Mixte de Recherche CEA CNRS, Université Paris VII UMR n158, Paris, France ), AE(Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre et Marie Curie, 98 bis Boulevard Arago, 75014 Paris, France ), AF(Institute for Astronomy, 2680 Woodlawn Dr., University of Hawaii, Honolulu, HI 96822, USA ), AG(California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA ), AH(Institute for Astronomy, 2680 Woodlawn Dr., University of Hawaii, Honolulu, HI 96822, USA ), AI(Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743, USA ), AJ(Institute for Astronomy, 2680 Woodlawn Dr., University of Hawaii, Honolulu, HI 96822, USA ), AK(Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA ), AL(Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan ), AM(Max Planck Institut für Extraterrestrische Physik, D-85478 Garching, Germany ), AN(Laboratoire d'Astrophysique de Toulouse/Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France ), AO(Laboratoire d'Astrophysique de Marseille, B.P. 8, Traverse du Siphon, 13376 Marseille Cedex 12, France ; Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan ), AP(California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA ; Physics Department, Graduate School of Science & Engineering, Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan ), AQ(California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA ), AR(Large Binocular Telescope Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721-0065, USA ), AS(Large Binocular Telescope Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721-0065, USA ), AT(Large Binocular Telescope Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721-0065, USA ), AU(Laboratoire d'Astrophysique de Toulouse/Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France ), AV(INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy ), AW(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), AX(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), AY(Max Planck Institut für Extraterrestrische Physik, D-85478 Garching, Germany ), AZ(California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125, USA ), BA(Large Binocular Telescope Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721-0065, USA ), BB(INAF-Osservatorio Astronomico di Brera, Milano, Italy ), BC(Laboratoire d'Astrophysique de Marseille, B.P. 8, Traverse du Siphon, 13376 Marseille Cedex 12, France ), BD(Laboratoire d'Astrophysique de Marseille, B.P. 8, Traverse du Siphon, 13376 Marseille Cedex 12, France ), BE(INAF-IASF Milano, via Bassini 15, 20133 Milano, Italy ), BF(INAF-IASF Milano, via Bassini 15, 20133 Milano, Italy ), BG(INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy ), BH(INAF-Osservatorio Astronomico di Brera, Milano, Italy ), BI(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), BJ(Laboratoire d'Astrophysique de Toulouse/Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France ), BK(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), BL(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), BM(Max Planck Institut für Extraterrestrische Physik, D-85478 Garching, Germany ), BN(Laboratoire d'Astrophysique de Toulouse/Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France ), BO(Laboratoire d'Astrophysique de Marseille, B.P. 8, Traverse du Siphon, 13376 Marseille Cedex 12, France ), BP(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), BQ(Institute for Astronomy, 2680 Woodlawn Dr., University of Hawaii, Honolulu, HI 96822, USA ), BR(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), BS(Max Planck Institut für Extraterrestrische Physik, D-85478 Garching, Germany ), BT(Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre et Marie Curie, 98 bis Boulevard Arago, 75014 Paris, France ), BU(Large Binocular Telescope Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721-0065, USA ), BV(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan ), BW(Max Planck Institut für Extraterrestrische Physik, D-85478 Garching, Germany ), BX(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), BY(Max Planck Institut für Extraterrestrische Physik, D-85478 Garching, Germany ), BZ(Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, I-35122 Padua, Italy ), CA(Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, I-35122 Padua, Italy ), CB(Department of Astronomy, Columbia University, MC2457, 550 W. 120 Street, New York, NY 10027, USA ), CC(INAF-IASF Milano, via Bassini 15, 20133 Milano, Italy ), CD(Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan ), CE(Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland ), CF( Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA ), CG(European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany), CH(Laboratoire d'Astrophysique de Toulouse/Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France ), CI(Laboratoire d'Astrophysique de Toulouse/Tarbes, Université de Toulouse, CNRS, 14 Avenue E. Belin, 31400 Toulouse, France ), CJ(INAF-IASF Milano, via Bassini 15, 20133 Milano, Italy ), CK(Large Binocular Telescope Observatory, University of Arizona, 933 N. Cherry Ave., Tucson, AZ 85721-0065, USA )
Publication:
The Astrophysical Journal, Volume 690, Issue 2, pp. 1236-1249 (2009). (ApJ Homepage)
Publication Date:
01/2009
Origin:
IOP
ApJ Keywords:
galaxies: distances and redshifts, galaxies: evolution, galaxies: formation
DOI:
10.1088/0004-637X/690/2/1236
Bibliographic Code:
2009ApJ...690.1236I

Abstract

We present accurate photometric redshifts (photo-z) in the 2-deg2 COSMOS field. The redshifts are computed with 30 broad, intermediate, and narrowbands covering the UV (Galaxy Evolution Explorer), visible near-IR (NIR; Subaru, Canada-France-Hawaii Telescope (CFHT), United Kingdom Infrared Telescope, and National Optical Astronomy Observatory), and mid-IR (Spitzer/IRAC). A χ2 template-fitting method (Le Phare) was used and calibrated with large spectroscopic samples from the Very Large Telescope Visible Multi-Object Spectrograph and the Keck Deep Extragalactic Imaging Multi-Object Spectrograph. We develop and implement a new method which accounts for the contributions from emission lines ([O II], Hβ, Hα, and Lyα) to the spectral energy distributions (SEDs). The treatment of emission lines improves the photo-z accuracy by a factor of 2.5. Comparison of the derived photo-z with 4148 spectroscopic redshifts (i.e., Δz = z s - z p) indicates a dispersion of \sigma _{\Delta z/(1+z_s)}=0.007 at i + AB < 22.5, a factor of 2-6 times more accurate than earlier photo-z in the COSMOS, CFHT Legacy Survey, and the Classifying Object by Medium-Band Observations-17 survey fields. At fainter magnitudes i + AB < 24 and z < 1.25, the accuracy is \sigma _{\Delta z/(1+z_s)}=0.012. The deep NIR and Infrared Array Camera coverage enables the photo-z to be extended to z ~ 2, albeit with a lower accuracy (\sigma _{\Delta z/(1+z_s)}=0.06 at i + AB ~ 24). The redshift distribution of large magnitude-selected samples is derived and the median redshift is found to range from z m = 0.66 at 22 < i + AB < 22.5 to z m = 1.06 at 24.5 < i + AB < 25. At i + AB < 26.0, the multiwavelength COSMOS catalog includes approximately 607,617 objects. The COSMOS-30 photo-z enables the full exploitation of this survey for studies of galaxy and large-scale structure evolution at high redshift.
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