Eriksen, M;
Alarcon, A;
Gaztanaga, E;
Amara, A;
Cabayol, L;
Carretero, J;
Castander, FJ;
... Tortorelli, L; + view all
(2019)
The PAU Survey: Early demonstration of photometric redshift performance in the COSMOS field.
Monthly Notices of the Royal Astronomical Society
10.1093/mnras/stz204.
(In press).
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Abstract
The PAU Survey (PAUS) is an innovative photometric survey with 40 narrow bands at the William Herschel Telescope (WHT). The narrow bands are spaced at 100Å intervals covering the range 4500Å to 8500Å and, in combination with standard broad bands, enable excellent redshift precision. This paper describes the technique, galaxy templates and additional photometric calibration used to determine early photometric redshifts from PAUS. Using BCNZ2, a new photometric redshift code developed for this purpose, we characterise the photometric redshift performance using PAUS data on the COSMOS field. Comparison to secure spectra from zCOSMOS DR3 shows that PAUS achieves σ68/(1 + z) = 0.0037 to iAB < 22.5 for the redshift range 0 < z < 1.2, when selecting the best 50% of the sources based on a photometric redshift quality cut. Furthermore, a higher photo-z precision (σ68/(1 + z) ∼ 0.001) is obtained for a bright and high quality selection, which is driven by the identification of emission lines. We conclude that PAUS meets its design goals, opening up a hitherto uncharted regime of deep, wide, and dense galaxy survey with precise redshifts that will provide unique insights into the formation, evolution and clustering of galaxies, as well as their intrinsic alignments.
| Type: | Article |
|---|---|
| Title: | The PAU Survey: Early demonstration of photometric redshift performance in the COSMOS field |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz204 |
| Publisher version: | https://doi.org/10.1093/mnras/stz204 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | galaxies: distances and redshifts, techniques: photometric, methods: data analysis |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10067038 |
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