Photometric redshifts for galaxies in the GOODS southern field

被引：87

作者：

Mobasher, B

Idzi, R

Benítez, N

Cimatti, A

Cristiani, S

Daddi, E

Dahlen, T

Dickinson, M

Erben, T

Ferguson, HC

Giavalisco, M

Grogin, NA

Koekemoer, AM

Mignoli, M

Moustakas, LA

Nonino, M

Rosati, P

Schirmer, M

Stern, D

Vanzella, E

Wolf, C

Zamorani, G

机构：

[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[2] European Space Agcy, Dept Space Sci, F-75738 Paris 15, France

[3] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[4] Osserv Astrofis Arcetri, Inst Nazl Astrofis, I-50125 Florence, Italy

[5] Osserv Astron Trieste, Inst Nazl Astrofis, I-34131 Trieste, Italy

[6] European So Observ, D-85748 Garching, Germany

[7] Univ Bonn, Inst Astrophys & Extraterr Forsch, D-53121 Bonn, Germany

[8] Osservatorio Astron Bologna, Inst Nazl Astrofis, I-40127 Bologna, Italy

[9] Max Planck Inst Astrophys, D-85748 Garching, Germany

[10] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[11] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

来源：

ASTROPHYSICAL JOURNAL | 2004年 / 600卷 / 02期

关键词：

galaxies : fundamental parameters; galaxies : photometry; X-rays : galaxies;

D O I：

10.1086/378186

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use extensive multiwavelength photometric data from the Great Observatories Origins Deep Survey to estimate photometric redshifts for a sample of 434 galaxies with spectroscopic redshifts in the Chandra Deep Field-South. 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 σ[Δz/(1+z(spec))]≤0.11. The outlier fraction is less than 10%, with the outlier-clipped rms being 0.047. We examine the accuracy of photometric redshifts for several special subclasses of objects. The results for extremely red objects are more accurate than those for the sample as a whole, with σ=0.051 and very few outliers (3%). Photometric redshifts for active galaxies, identified from their X-ray emission, have a dispersion of σ=0.104, with 10% outlier fraction, similar to that for normal galaxies. Employing a redshift/magnitude prior in this process seems to be crucial in improving the agreement between photometric and spectroscopic redshifts.

引用

页码：L167 / L170

页数：4

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