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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 2025.Extragalactic globular clusters (EGCs) are an abundant and powerful tracer of galaxy dynamics and formation, and their own formation and evolution is also a matter of extensive debate. The compact nature of globular clusters means that they are hard to spatially resolve and thus study outside the Local Group. In this work we have examined how well EGCs will be detectable in images from the Euclid telescope, using both simulated pre-launch images and the first early-release observations of the Fornax galaxy cluster. The Euclid Wide Survey will provide high-spatial resolution VIS imaging in the broad IE band as well as near-infrared photometry (YE, JE, and HE). We estimate that the 24 719 known galaxies within 100 Mpc in the footprint of the Euclid survey host around 830 000 EGCs of which about 350 000 are within the survey's detection limits. For about half of these EGCs, three infrared colours will be available as well. For any galaxy within 50 Mpc the brighter half of its GC luminosity function will be detectable by the Euclid Wide Survey. The detectability of EGCs is mainly driven by the residual surface brightness of their host galaxy. We find that an automated machine-learning EGC-classification method based on real Euclid data of the Fornax galaxy cluster provides an efficient method to generate high purity and high completeness GC candidate catalogues. We confirm that EGCs are spatially resolved compared to pure point sources in VIS images of Fornax. Our analysis of both simulated and first on-sky data show that Euclid will increase the number of GCs accessible with high-resolution imaging substantially compared to previous surveys, and will permit the study of GCs in the outskirts of their hosts. Euclid is unique in enabling systematic studies of EGCs in a spatially unbiased and homogeneous manner and is primed to improve our understanding of many understudied aspects of GC astrophysics.
Author(s): Voggel K, Lancon A, Saifollahi T, Larsen SS, Cantiello M, Rejkuba M, Cuillandre J-C, Hudelot P, Nucita AA, Urbano M, Romelli E, Raj MA, Schirmer M, Tortora C, Abdurro'uf, Annibali F, Baes M, Boldrini P, Cabanac R, Carollo D, Conselice CJ, Duc P-A, Ferguson AMN, Hunt LK, Knapen JH, Lonare P, Marleau FR, Paolillo M, Poulain M, Sanchez-Janssen R, Sola E, Andreon S, Auricchio N, Baccigalupi C, Baldi M, Bardelli S, Bodendorf C, Bonino D, Branchini E, Brescia M, Brinchmann J, Camera S, Capobianco V, Carbone C, Carlberg RG, Carretero J, Casas S, Castellano M, Castignani G, Cavuoti S, Cimatti A, Colodro-Conde C, Congedo G, Conversi L, Copin Y, Courbin F, Courtois HM, Cropper M, Da Silva A, Degaudenzi H, De Lucia G, Di Giorgio AM, Dinis J, Dubath F, Dupac X, Dusini S, Farina M, Farrens S, Ferriol S, Fotopoulou S, Frailis M, Franceschi E, Fumana M, Galeotta S, George K, Gillard W, Gillis B, Giocoli C, Gomez-Alvarez P, Grazian A, Grupp F, Haugan SVH, Hoekstra H, Holmes W, Hook I, Hormuth F, Hornstrup A, Jahnke K, Keihanen E, Kermiche S, Kiessling A, Kilbinger M, Kohley R, Kubik B, Kummel M, Kunz M, Kurki-Suonio H, Laureijs R, Liebing P, Ligori S, Lilje PB, Lindholm V, Lloro I, Maino D, Maiorano E, Mansutti O, Marggraf O, Markovic K, Martinelli M, Martinet N, Marulli F, Massey R, Maurogordato S, Medinaceli E, Mei S, Mellier Y, Meneghetti M, Merlin E, Meylan G, Moresco M, Moscardini L, Munari E, Nakajima R, Neissner C, Nichol RC, Niemi S-M, Nightingale JW, Padilla C, Paltani S, Pasian F, Pedersen K, Pettorino V, Pires S, Polenta G, Poncet M, Popa LA, Pozzetti L, Raison F, Rebolo R, Renzi A, Rhodes J, Riccio G, Roncarelli M, Rossetti E, Saglia R, Sakr Z, Sapone D, Sartoris B, Scaramella R, Schneider P, Schrabback T, Secroun A, Sefusatti E, Seidel G, Serrano S, Sirignano C, Sirri G, Stanco L, Steinwagner J, Surace C, Tallada-Crespi P, Teplitz HI, Tereno I, Toledo-Moreo R, Torradeflot F, Tutusaus I, Valentijn EA, Valenziano L, Vassallo T, Veropalumbo A, Wang Y, Weller J, Zamorani G, Zucca E, Biviano A, Bolzonella M, Bozzo E, Burigana C, Calabrese M, Di Ferdinando D, Escartin Vigo JA, Farinelli R, Gracia-Carpio J, Mauri N, Scottez V, Tenti M, Viel M, Wiesmann M, Akrami Y, Allevato V, Anselmi S, Ballardini M, Bethermin M, Blanchard A, Blot L, Borgani S, Borlaff AS, Bruton S, Calabro A, Canas-Herrera G, Cappi A, Carvalho CS, Castro T, Chambers KC, Contarini S, Cooray AR, De Caro B, Desprez G, Diaz-Sanchez A, Di Domizio S, Dole H, Escoffier S, Ferrero I, Finelli F, Fornari F, Gabarra L, Ganga K, Garcia-Bellido J, Gautard V, Gaztanaga E, Giacomini F, Gozaliasl G, Hall A, Hildebrandt H, Hjorth J, Ilbert O, Kajava JJE, Kansal V, Karagiannis D, Kirkpatrick CC, Legrand L, Libet G, Loureiro A, Macias-Perez J, Maggio G, Magliocchetti M, Mannucci F, Maoli R, Martins CJAP, Matthew S, Maurin L, Metcalf RB, Monaco P, Moretti C, Morgante G, Walton NA, Patrizii L, Pezzotta A, Pontinen M, Popa V, Porciani C, Potter D, Reimberg P, Risso I, Rocci P-F, Sahlen M, Schneider A, Sereno M, Simon P, Spurio Mancini A, Testera G, Teyssier R, Toft S, Tosi S, Troja A, Tucci M, Valiviita J, Vergani D, Verza G, Zinchenko IA, Mamon GA, Scott D
Publication type: Article
Publication status: Published
Journal: Astronomy and Astrophysics
Year: 2025
Volume: 693
Print publication date: 01/01/2025
Online publication date: 22/01/2025
Acceptance date: 06/11/2024
Date deposited: 17/02/2025
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746
Publisher: EDP Sciences
URL: https://doi.org/10.1051/0004-6361/202450851
DOI: 10.1051/0004-6361/202450851
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