Browse by author
Lookup NU author(s): Dr James Nightingale
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Authors 2024.The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid’s cameras is taken into account by means of accurate, effective point spread function (ePSF) modelling. We present a complex, detailed workflow to simultaneously solve for the geometric distortion (GD) and model the undersampled ePSFs of the Euclid detectors. Our procedure was successfully developed and tested with data from the Early Release Observations (ERO) programme focused on the nearby globular cluster NGC 6397. Our final one-dimensional astrometric precision for a well-measured star just below saturation is 0.7 mas (0.007 pixel) for the Visible Instrument (VIS) and 3 mas (0.01 pixel) for the Near-Infrared Spectrometer and Photometer (NISP). Finally, we present a specific scientific application of this high-precision astrometry: the combination of Euclid and Gaia data to compute proper motions and study the internal kinematics of NGC 6397. Future work, when more data become available, will allow for a better characterisation of the ePSFs and GD corrections that are derived here, along with assessment of their temporal stability, and their dependencies on the spectral energy distribution of the sources as seen through the wide-band filters of Euclid.
Author(s): Libralato M, Bedin LR, Griggio M, Massari D, Anderson J, Cuillandre J-C, Ferguson AMN, Lancon A, Larsen SS, Schirmer M, Annibali F, Balbinot E, Dalessandro E, Erkal D, Kuzma PB, Saifollahi T, Verdoes Kleijn G, Kummel M, Nakajima R, Correnti M, Battaglia G, Altieri B, Amara A, Andreon S, Baccigalupi C, Baldi M, Balestra A, Bardelli S, Basset A, Battaglia P, Bonino D, Branchini E, Brescia M, Brinchmann J, Caillat A, Camera S, Capobianco V, Carbone C, Carretero J, Casas S, Castellano M, Castignani G, Cavuoti S, Cimatti A, Colodro-Conde C, Congedo G, Conselice CJ, Conversi L, Copin Y, Courbin F, Courtois HM, Cropper M, Da Silva A, Degaudenzi H, De Lucia G, Dinis J, Dubath F, Dupac X, Dusini S, Fabricius M, Farina M, Farrens S, Faustini F, Ferriol S, Fosalba P, Frailis M, Franceschi E, Fumana M, Galeotta S, Garilli B, George K, Gillard W, Gillis B, Giocoli C, Gomez-Alvarez P, Grazian A, Grupp F, Guzzo L, Haugan SVH, Hoar J, Hoekstra H, Holmes W, Hormuth F, Hornstrup A, Hudelot P, Jahnke K, Jhabvala M, Keihanen E, Kermiche S, Kiessling A, Kilbinger M, Kubik B, Kunz M, Kurki-Suonio H, Laureijs R, Le Mignant D, Ligori S, Lilje PB, Lindholm V, Lloro I, Maiorano E, Mansutti O, Marggraf O, Markovic K, Martinelli M, Martinet N, Marulli F, Massey R, Medinaceli E, Mei S, Melchior M, Mellier Y, Meneghetti M, Merlin E, Meylan G, Moresco M, Moscardini L, Neissner C, Nichol RC, Niemi S-M, Nightingale JW, Padilla C, Paltani S, Pasian F, Pedersen K, Percival WJ, Pettorino V, Pires S, Polenta G, Poncet M, Popa LA, Pozzetti L, Raison F, Rebolo R, Refregier A, Renzi A, Rhodes J, Riccio G, Romelli E, Roncarelli M, Rossetti E, Saglia R, Sakr Z, Sanchez AG, Sapone D, Sartoris B, Sauvage M, Schneider P, Schrabback T, Secroun A, Sefusatti E, Seidel G, Seiffert M, Serrano S, Sirignano C, Sirri G, Skottfelt J, Stanco L, Steinwagner J, Tallada-Crespi P, Taylor AN, Teplitz HI, Tereno I, Toledo-Moreo R, Torradeflot F, Tsyganov A, Tutusaus I, Valenziano L, Vassallo T, Veropalumbo A, Wang Y, Weller J, Zamorani G, Zucca E, Burigana C, Scottez V, Scott D, Smart RL
Publication type: Article
Publication status: Published
Journal: Astronomy and Astrophysics
Year: 2024
Volume: 692
Print publication date: 01/12/2024
Online publication date: 06/12/2024
Acceptance date: 24/10/2024
Date deposited: 07/01/2025
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746
Publisher: EDP Sciences
URL: https://doi.org/10.1051/0004-6361/202452295
DOI: 10.1051/0004-6361/202452295
Data Access Statement: As part of this publication, we release the star catalogues (positions, photometry and proper motions) and the astrometrized stacked images through the CDS and our website (https://web.oapd.inaf.it/bedin/files/PAPERs_eMATERIALs/Euclid/Paper01/). Astro-photometric catalogues and stacked images are available at the CDS via anonymous ftp to to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/692/A96.
Altmetrics provided by Altmetric
