The Physics of the Accelerating Universe Survey: narrow-band image photometry

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 tr...

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Detalles Bibliográficos
Autores: Serrano, Santiago, Gaztanaga, E., Castander, Francisco Javier, Eriksen, Martin Børstad, Casas, Ricard, Navarro-Gironés, David, Alarcon, Álex, Bauer, Anne H., Cabayol García, Laura, Carretero, J., Fernández, Enrique, Neissner, Christian, Renard, Pablo, Tallada Crespí, Pau, Tonello, Nadia, Sevilla Noarbe, Ignacio, Crocce, Martin, García-Bellido Capdevila, Juan, Hildebrandt, Hendrik, Hoekstra, Henk, Joachimi, Benjamin, Miquel, Ramón, Padilla, Cristóbal, Sánchez, E., De Vicente, J.
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/715503
Acceso en línea:http://hdl.handle.net/10486/715503
https://dx.doi.org/10.1093/mnras/stad1399
Access Level:acceso abierto
Palabra clave:Cosmology: observations
instrumentation: detectors
large-scale structure of Universe
methods: data analysis
techniques: image processing
techniques: photometric
Física
Descripción
Sumario: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

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