Serrano, S;
Gaztañaga, E;
Castander, FJ;
Eriksen, M;
Casas, R;
Navarro-Gironés, D;
Alarcon, A;
... de Vicente, J; + view all
(2023)
The Physics of the Accelerating Universe Survey: narrow-band image photometry.
Monthly Notices of the Royal Astronomical Society
, 523
(3)
pp. 3287-3317.
10.1093/mnras/stad1399.
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Abstract
PAUCam is an innovative optical narrow-band imager mounted at the William Herschel Telescope built for the Physics of the Accelerating Universe Survey (PAUS). Its set of 40 filters results in images that are complex to calibrate, with specific instrumental signatures that cannot be processed with traditional data reduction techniques. In this paper, we present two pipelines developed by the PAUS data management team with the objective of producing science-ready catalogues from the uncalibrated raw images. The NIGHTLY pipeline takes care of entire image processing, with bespoke algorithms for photometric calibration and scatter-light correction. The Multi-Epoch and Multi-Band Analysis pipeline performs forced photometry over a reference catalogue to optimize the photometric redshift (photo-z) performance. We verify against spectroscopic observations that the current approach delivers an inter-band photometric calibration of 0.8 per cent across the 40 narrow-band set. The large volume of data produced every night and the rapid survey strategy feedback constraints require operating both pipelines in the Port d’Informació Cientifica data centre with intense parallelization. While alternative algorithms for further improvements in photo-z performance are under investigation, the image calibration and photometry presented in this work already enable state-of-the-art photo-z down to iAB = 23.0.
| Type: | Article |
|---|---|
| Title: | The Physics of the Accelerating Universe Survey: narrow-band image photometry |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stad1399 |
| Publisher version: | https://doi.org/10.1093/mnras/stad1399 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | instrumentation: detectors, methods: data analysis, techniques: image processing, techniques: photometric, large-scale structure of Universe, cosmology: observations |
| 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/10172476 |
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