COSMOS Photometric Redshifts with 30-bands for 2-deg2

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dc.creatorIlbert, O.
dc.creatorCapak, P.
dc.creatorSalvato, M.
dc.creatorAussel, H.
dc.creatorMcCracken, H. J.
dc.creatorSanders, D. B.
dc.creatorScoville, N.
dc.creatorKartaltepe, J.
dc.creatorArnouts, S.
dc.creatorFloc'h, E. Le
dc.creatorMobasher, B.
dc.creatorTaniguchi, Y.
dc.creatorLamareille, F.
dc.creatorLeauthaud, A.
dc.creatorSasaki, S.
dc.creatorThompson, D.
dc.creatorZamojski, M.
dc.creatorZamorani, G.
dc.creatorBardelli, S.
dc.creatorBolzonella, M.
dc.creatorBongiorno, A.
dc.creatorBrusa, M.
dc.creatorCaputi, K. I.
dc.creatorCarollo, C. M.
dc.creatorContini, T.
dc.creatorCook, R.
dc.creatorCoppa, G.
dc.creatorCucciati, O.
dc.creatorde la Torre, S.
dc.creatorde Ravel, L.
dc.creatorFranzetti, P.
dc.creatorGarilli, B.
dc.creatorHasinger, G.
dc.creatorIovino, A.
dc.creatorKampczyk, P.
dc.creatorKneib, J. -P.
dc.creatorKnobel, C.
dc.creatorKovac, K.
dc.creatorBorgne, J. F. Le
dc.creatorBrun, V. Le
dc.creatorFevre, O. Le
dc.creatorLilly, S.
dc.creatorLooper, D.
dc.creatorMaier, C.
dc.creatorMainieri, V.
dc.creatorMellier, Y.
dc.creatorMignoli, M.
dc.creatorMurayama, T.
dc.creatorPello, R.
dc.creatorPeng, Y.
dc.creatorPerez-Montero, E.
dc.creatorRenzini, A.
dc.creatorRicciardelli, E.
dc.creatorSchiminovich, D.
dc.creatorScodeggio, M.
dc.creatorShioya, Y.
dc.creatorSilverman, J.
dc.creatorSurace, J.
dc.creatorTanaka, M.
dc.creatorTasca, L.
dc.creatorTresse, L.
dc.creatorVergani, D.
dc.creatorZucca, E.
dc.date2008-09-11
dc.date.accessioned2026-07-07T12:15:38Z
dc.date.available2026-07-07T12:15:38Z
dc.descriptionWe present accurate photometric redshifts in the 2-deg2 COSMOS field. The redshifts are computed with 30 broad, intermediate, and narrow bands covering the UV (GALEX), Visible-NIR (Subaru, CFHT, UKIRT and NOAO) and mid-IR (Spitzer/IRAC). A chi2 template-fitting method (Le Phare) was used and calibrated with large spectroscopic samples from VLT-VIMOS and Keck-DEIMOS. We develop and implement a new method which accounts for the contributions from emission lines (OII, Hbeta, Halpha and Ly) 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. Delta z = zs - zp) indicates a dispersion of sigma_{Delta z/(1+zs)}=0.007 at i<22.5, a factor of 2-6 times more accurate than earlier photo-z in the COSMOS, CFHTLS and COMBO-17 survey fields. At fainter magnitudes i<24 and z<1.25, the accuracy is sigma_{Delta z/(1+zs)}=0.012. The deep NIR and IRAC coverage enables the photo-z to be extended to z~2 albeit with a lower accuracy (sigma_{Delta z/(1+zs)}=0.06 at i~24). The redshift distribution of large magnitude-selected samples is derived and the median redshift is found to range from z=0.66 at 22<i<22.5 to z=1.06 at 24.5<i<25. At i<26.0, the multi-wavelength COSMOS catalog includes approximately 607,617 objects. The COSMOS-30 photo-z enable the full exploitation of this survey for studies of galaxy and large scale structure evolution at high redshift.
dc.description21 pages, 14 figures, and 3 tables ; accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/0809.2101
dc.identifierhttp://arxiv.org/abs/0809.2101
dc.identifierAstrophys.J.690:1236-1249,2009
dc.identifierdoi:10.1088/0004-637X/690/2/1236
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211548
dc.subjectAstrophysics
dc.titleCOSMOS Photometric Redshifts with 30-bands for 2-deg2
dc.typetext

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