COSMOS Photometric Redshifts with 30-bands for 2-deg2

O., Ilbert,; P., Capak,; M., Salvato,; H., Aussel,; J., McCracken, H.; B., Sanders, D.; N., Scoville,; J., Kartaltepe,; S., Arnouts,; Le, Floc'h, E.; B., Mobasher,; Y., Taniguchi,; F., Lamareille,; A., Leauthaud,; S., Sasaki,; D., Thompson,; M., Zamojski,; G., Zamorani,; S., Bardelli,; M., Bolzonella,; A., Bongiorno,; M., Brusa,; I., Caputi, K.; M., Carollo, C.; 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,; -P., Kneib, J.; C., Knobel,; K., Kovac,; Le, Borgne, J. F.; Le, Brun, V.; Le, Fevre, O.; 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,

doi:10.48550/arxiv.0809.2101

articleSep 11, 2008GREEN OA

COSMOS Photometric Redshifts with 30-bands for 2-deg2

IOIlbert, O.CPCapak, P.SMSalvato, M.AHAussel, H.MHMcCracken, H. J.

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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)…

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Authors

63

IO
Ilbert, O.Corresponding
CP
Capak, P.
SM
Salvato, M.
AH
Aussel, H.
MH
McCracken, H. J.

Topics & keywords

Topics

Keywords

Physics
Redshift
Spectrograph
Astrophysics
Photometric redshift
Galaxy
Astronomy
Telescope

UN Sustainable Development Goals

Affordable and clean energy

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