The PAU Survey: Photometric Calibration of Narrow Band Images

F. J. Castander (1; 2); S. Serrano (1; 2); M. Eriksen (3 and; 12); E. Gaztanaga (4; 1; 2); R. Casas (1; 2); A. Alarcon (1; 2),; A. H. Bauer (1; 2); E. Fernandez (3); D. Navarro-Girones (1; 2); N.; Tonello (3; 12); L. Cabayol (3; 12); J. Carretero (3; 12); J. De; Vicente (5); J. Garcia-Bellido (6); H. Hildebrandt (7); H. Hoekstra (8); B.; Joachimi (9); R. Miquel (3; 10); C. Padilla (3); P. Renard (11); E.; Sanchez (5); I. Sevilla-Noarre (5); P. Tallada-Crespi (5; 12) ((1); Institute of Space Sciences (ICE; CSIC); Campus UAB; Barcelona; Spain; (2); Institut d'Estudis Espacials de Catalunya (IEEC); Edifici RDIT; Campus UPC,; Castelldefels; Barcelona; Spain; (3) Institut de F\'isica d'Altes Energies; (IFAE); The Barcelona Institute of Science; Technology; Campus UAB,; Bellaterra (Barcelona); Spain; (4) Institute of Cosmology; Gravitation,; University of Portsmouth; Portsmouth; UK; (5) Centro de Investigaciones; Energ\'eticas; Medioambientales y Tecnol\'ogicas (CIEMAT); Madrid; Spain; (6); Instituto de F\'isica Te\'orica UAM-CSIC; Campus de Cantoblanco; Madrid,; Spain; (7) Ruhr University Bochum; Faculty of Physics; Astronomy,; Astronomical Institute (AIRUB); German Centre for Cosmological Lensing; (GCCL); Bochum; Germany; (8) Leiden Observatory; Leiden University; Leiden,; The Netherlands; (9) Department of Physics; Astronomy; University College; London; Gower Street; London; UK; (10) Institucio Catalana de Recerca i; Estudis Avancats (ICREA); Barcelona; Spain; (11) Department of Astronomy,; Tsinghua University; Beijing; China; (12) Port d'Informaci\'o; Cient\'ifica; Campus UAB; Bellaterra (Barcelona); Spain)

arXiv:2406.06850·astro-ph.IM·June 12, 2024

The PAU Survey: Photometric Calibration of Narrow Band Images

F. J. Castander (1, 2), S. Serrano (1, 2), M. Eriksen (3 and, 12), E. Gaztanaga (4, 1, 2), R. Casas (1, 2), A. Alarcon (1, 2),, A. H. Bauer (1, 2), E. Fernandez (3), D. Navarro-Girones (1, 2), N., Tonello (3, 12), L. Cabayol (3, 12), J. Carretero (3, 12), J. De, Vicente (5)

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TL;DR

The paper details the calibration process of the PAU Survey's narrow band images, achieving high accuracy and uniformity, crucial for precise photometric redshift measurements in cosmology.

Contribution

It introduces a calibration method using stellar templates and external catalogs, improving accuracy and wavelength uniformity for narrow band imaging.

Findings

01

Calibration accuracy of about 2% in the AB system.

02

Improved precision to around 1% using blue stars.

03

Calibration validated by photometric redshift performance.

Abstract

The Physics of the Accelerating Universe (PAU) camera is an optical narrow band and broad band imaging instrument mounted at the prime focus of the William Herschel Telescope. We describe the image calibration procedure of the PAU Survey data. We rely on an external photometric catalogue to calibrate our narrow band data using stars that have been observed by both datasets. We fit stellar templates to the stellar broad band photometry of the Sloan Digital Sky Survey and synthesise narrow band photometry that we compare to the PAUS narrow band data to determine their calibration. Consequently, the PAUS data are in the AB system as inherited from its reference calibrator. We do several tests to check the performance of the calibration. We find it self-consistent when comparing repeated observations of the same objects, with a good overall accuracy to the AB system which we estimate to be…

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Taxonomy

TopicsCalibration and Measurement Techniques