Publication details for Prof David AlexanderYang, G., Xue, Y.Q., Luo, B., Brandt, W.N., Alexander, D.M., Bauer, F.E., Cui, W., Kong, X., Lehmer, B.D., Wang, J.-X., Wu, X.-B., Yuan, F., Yuan, Y.-F. & Zhou, H.Y. (2014). Photometric Redshifts in the Hawaii-Hubble Deep Field-North (H-HDF-N). The Astrophysical Journal Supplement Series 215(2): 27.
- Publication type: Journal Article
- ISSN/ISBN: 0067-0049
- DOI: 10.1088/0067-0049/215/2/27
- Keywords: Catalogs, Cosmology: observations, Galaxies: distances and redshifts, Galaxies: evolution, Galaxies: formation, Surveys.
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
- View in another repository - may include full text
Author(s) from Durham
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.