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Photometric redshifts in the Hawaii-Hubble Deep Field-North (H-HDF-N).

Yang, G. and Xue, Y.Q. and Luo, B. and Brandt, W.N. and Alexander, D.M. and Bauer, F.E. and Cui, W. and Kong, X. and Lehmer, B.D. and Wang, J.-X. and Wu, X.-B. and Yuan, F. and Yuan, Y.-F. and Zhou, H.Y. (2014) 'Photometric redshifts in the Hawaii-Hubble Deep Field-North (H-HDF-N).', Astrophysical journal supplement series., 215 (2). p. 27.


We derive photometric redshifts (z phot) for sources in the entire (~0.4 deg2) 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 μm). Our catalog consists of a total of 131,678 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 σNMAD = 0.029 and an outlier fraction of 5.5% (outliers are defined as sources having |zphot – zspec |/(1 + zspec ) > 0.15) for non-X-ray sources. More specifically, we obtain σNMAD = 0.024 with 2.7% outliers for sources brighter than R = 23 mag, σNMAD = 0.035 with 7.4% outliers for sources fainter than R = 23 mag, σNMAD = 0.026 with 3.9% outliers for sources having z < 1, and σNMAD = 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 126,719 galaxies. Furthermore, we match our catalog with the 2 Ms 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 σNMAD = 0.035 and an outlier fraction of 12.5%. We make our catalog publicly available presenting both photometry and z phot, and provide guidance on how to make use of our catalog.

Item Type:Article
Keywords:Catalogs, Cosmology: observations, Galaxies: distances and redshifts, Galaxies: evolution, Galaxies: formation, Surveys.
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Publisher statement:© 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
Date accepted:24 October 2014
Date deposited:27 May 2015
Date of first online publication:December 2014
Date first made open access:No date available

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