Photometric Redshifts for Galaxies in the GOODS Southern Field | Zendy

Bahram Mobasher | Zendy; R. Idzi | Zendy; N. Bentez | Zendy; A. Cimatti | Zendy; S. Cristiani | Zendy; E. Daddi | Zendy; T. Dahlén | Zendy; Mark Dickinson | Zendy; T. Erben | Zendy; Henry C. Ferguson | Zendy; Mauro Giavalisco | Zendy; Norman A. Grogin | Zendy; Anton M. Koekemoer | Zendy; M. Mignoli | Zendy; Leonidas A. Moustakas | Zendy; M. ino | Zendy; P. Rosati | Zendy; M. Schirmer | Zendy; Daniel Stern | Zendy; E. Vanzella | Zendy; Christian Wolf | Zendy; G. Zamorani | Zendy

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Photometric Redshifts for Galaxies in the GOODS Southern Field

Author(s) -

Bahram Mobasher,

R. Idzi,

N. Bentez,

A. Cimatti,

S. Cristiani,

E. Daddi,

T. Dahlén,

Mark Dickinson,

T. Erben,

Henry C. Ferguson,

Mauro Giavalisco,

Norman A. Grogin,

Anton M. Koekemoer,

M. Mignoli,

Leonidas A. Moustakas,

M. ino,

P. Rosati,

M. Schirmer,

Daniel Stern,

E. Vanzella,

Christian Wolf,

G. Zamorani

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/378186

Subject(s) - redshift , astrophysics , physics , galaxy , photometric redshift , outlier , astronomy , artificial intelligence , computer science

We use extensive multi-wavelength photometric data from the GreatObservatories Origins Deep Survey (GOODS) to estimate photometric redshifts fora sample of 434 galaxies with spectroscopic redshifts in the Chandra Deep FieldSouth. Using the Bayesian method, which incorporates redshift/magnitude priors,we estimate photometric redshifts for galaxies in the range 18 < R (AB) < 25.5,giving an rms scatter of 0.11. The outlier fraction is < 10%, with theoutlier-clipped rms being 0.047. We examine the accuracy of photometricredshifts for several, special sub--classes of objects. The results forextremely red objects are more accurate than those for the sample as a whole,with rms of 0.051 and very few outliers (3%). Photometric redshifts for activegalaxies, identified from their X-ray emission, have a dispersion of 0.104,with 10% outlier fraction, similar to that for normal galaxies. Employing aredshift/magnitude prior in this process seems to be crucial in improving theagreement between photometric and spectroscopic redshifts.

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