Photometric redshifts in the Hawaii-HDF-N Virtual Observatory Resource

Authors
  1. Yang G.
  2. Xue Y.Q.
  3. Luo B.
  4. Brandt W.N.
  5. Alexander D.M.
  6. Bauer F.E.
  7. Cui W.,Kong X.
  8. Lehmer B.D.
  9. Wang J.-X.
  10. Wu X.-B.
  11. Yuan F.
  12. Yuan Y.-F.
  13. Zhou H.Y.
  14. Published by
    CDS
Abstract

We derive photometric redshifts (z_phot_) for sources in the entire (~0.4deg^2^) Hawaii-Hubble Deep Field-North (H-HDF-N) field with the EAzY code, based on point-spread-function-matched photometry of 15 broad bands from the ultraviolet (U band) to mid-infrared (IRAC 4.5{mu}m). Our catalog consists of a total of 131678 sources. We evaluate the z_phot_ quality by comparing z_phot_with spectroscopic redshifts (z_spec_) when available, and find a value of normalized median absolute deviation {sigma}_NMAD_=0.029 and an outlier fraction of 5.5% (outliers are defined as sources having |z_phot_-z_spec_|/(1+z_spec_)>0.15) for non-X-ray sources. More specifically, we obtain {sigma}_NMAD_=0.024 with 2.7% outliers for sources brighter than R=23mag, {sigma}_NMAD_=0.035 with 7.4% outliers for sources fainter than R=23mag, {sigma}_NMAD_=0.026 with 3.9% outliers for sources having z<1, and {sigma}_NMAD_=0.034 with 9.0% outliers for sources having z>1. Our z_phot_ quality shows an overall improvement over an earlier z_phot_ work that focused only on the central H-HDF-N area. We also classify each object as a star or galaxy through template spectral energy distribution fitting and complementary morphological parameterization, resulting in 4959 stars and 126719 galaxies. Furthermore, we match our catalog with the 2Ms Chandra Deep Field-North main X-ray catalog. For the 462 matched non-stellar X-ray sources (281 having z_spec_), we improve their z_phot_ quality by adding three additional active galactic nucleus templates, achieving {sigma}_NMAD_=0.035 and an outlier fraction of 12.5%.

Keywords
  1. redshifted
  2. infrared-photometry
  3. visible-astronomy
  4. Wide-band photometry
  5. surveys
Bibliographic source Bibcode
2014ApJS..215...27Y
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/215/27
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/215/27
Document Object Identifer DOI
doi:10.26093/cds/vizier.22150027

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/215/27
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/215/27
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/215/27
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/215/27/table6?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/215/27/table6?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/215/27/table6?

History

2015-02-27T11:03:28Z
Resource record created
2015-02-27T11:03:28Z
Created
2015-03-25T12:48:24Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr