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COSMOS Photometric Redshifts with 30-bands for 2-deg2 | | O. Ilbert
; P. Capak
; M. Salvato
; H. Aussel
; H. J. McCracken
; D. B. Sanders
; N. Scoville
; J. Kartaltepe
; S. Arnouts
; E. Le Floc'h
; B. Mobasher
; Y. Taniguchi
; F. Lamareille
; A. Leauthaud
; S. Sasaki
; D. Thompson
; M. Zamojski
; G. Zamorani
; S. Bardelli
; M. Bolzonella
; A. Bongiorno
; M. Brusa
; K.I. Caputi
; C.M. Carollo
; T. Contini
; R. Cook
; G. Coppa
; O. Cucciati
; S. de la Torre
; L. de Ravel
; P. Franzetti
; B. Garilli
; G. Hasinger
; A. Iovino
; P. Kampczyk
; J.-P. Kneib
; C. Knobel
; K. Kovac
; J.F. Le Borgne
; V. Le Brun
; O. Le Fevre
; S. Lilly
; D. Looper
; C. Maier
; V. Mainieri
; Y. Mellier
; M. Mignoli
; T. Murayama
; R. Pello
; Y. Peng
; E. Perez-Montero
; A. Renzini
; E. Ricciardelli
; D. Schiminovich
; M. Scodeggio
; Y. Shioya
; J. Silverman
; J. Surace
; M. Tanaka
; L. Tasca
; L. Tresse
; D. Vergani
; E. Zucca
; | | Date: |
11 Sep 2008 | | Abstract: | We 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. | | Source: | arXiv, 0809.2101 | | Services: | Forum | Review | PDF | Favorites | |
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