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Photometric Redshifts in the Hawaii-hubble Deep Field-north ( H-hdf-n )
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yang, Guiiun Xue, Y. Q. Luo, B. Brandt, William N. Alexander, Dave M. Bauer, Franz Erik Cui, Weiguang Kong, Xu Lehmer, B. D. Wang, Junming Wu, Xue-Feng Yuan, Fangting Yuan, Yefei Zhou, Yi |
| Copyright Year | 2015 |
| Abstract | We derive photometric redshifts (zphot) 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 zphot quality by comparing zphot with spectroscopic redshifts (zspec) 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 zphot quality shows an overall improvement over an earlier zphot 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 zspec), we improve their zphot 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 zphot, and provide guidance on how to make use of our catalog. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://dro.dur.ac.uk/15576/1/15576.pdf?DDD25+dul4eg |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | A* search algorithm Active galactic nucleus Bands Cell Nucleus Clinical Use Template Diagnostic radiologic examination GUCY2C protein, human Hierarchical Data Format MAG (cryptography) Outlier Photometric stereo Photometry Redshift Stars, Celestial Stellar (payment network) |
| Content Type | Text |
| Resource Type | Article |
