CHANCES, the Chilean Cluster Galaxy Evolution Survey: Selection and initial characterisation of clusters and superclusters

Cristóbal Sifón; Alexis Finoguenov; Christopher P. Haines; Yara Jaffé; B. M. Amrutha; Ricardo Demarco; E. V. R. Lima; Ciria Lima-Dias; Hugo Méndez-Hernández; Paola Merluzzi; Antonela Monachesi; Gabriel S. M. Teixeira; Nicolas Tejos; F. Almeida-Fernandes; Pablo Araya-Araya; Maria Argudo-Fernández; Raúl Baier-Soto; Lawrence E. Bilton; C. R. Bom; Juan Pablo Calderón; Letizia P. Cassarà; Johan Comparat; H. M. Courtois; Giuseppe D’Ago; Alexandra Dupuy; Alexander Fritz; Rodrigo F. Haack; Fabio R. Herpich; E. Ibar; Ulrike Kuchner; Ivan Lacerna; Amanda R. Lopes; Sebastian Lopez; Elismar Lösch; Sean McGee; C. Mendes de Oliveira; Lorenzo Morelli; Alessia Moretti; Diego Pallero; Franco Piraino-Cerda; Emanuela Pompei; U. Rescigno; Analía V. Smith Castelli; Rory Smith; Laerte Sodré Jr; Elmo Tempel

doi:10.1051/0004-6361/202452710

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A&A, 697 (2025) A92

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Issue		A&A Volume 697, May 2025


Article Number		A92
Number of page(s)		16
Section		Extragalactic astronomy
DOI		https://doi.org/10.1051/0004-6361/202452710
Published online		08 May 2025

A&A, 697, A92 (2025)

CHANCES, the Chilean Cluster Galaxy Evolution Survey: Selection and initial characterisation of clusters and superclusters

Cristóbal Sifón¹^⋆, Alexis Finoguenov², Christopher P. Haines³^,33, Yara Jaffé⁴^,33, B. M. Amrutha³, Ricardo Demarco⁵, E. V. R. Lima⁶, Ciria Lima-Dias⁷^,8, Hugo Méndez-Hernández⁷^,8^,33, Paola Merluzzi⁹, Antonela Monachesi⁷, Gabriel S. M. Teixeira¹⁰, Nicolas Tejos¹, F. Almeida-Fernandes⁶^,11, Pablo Araya-Araya⁶, Maria Argudo-Fernández¹²^,13, Raúl Baier-Soto⁴^,33, Lawrence E. Bilton¹⁴^,4^,1^,15, C. R. Bom¹⁰, Juan Pablo Calderón¹⁶^,17^,18, Letizia P. Cassarà¹⁹, Johan Comparat²⁰, H. M. Courtois²¹, Giuseppe D’Ago²², Alexandra Dupuy²³, Alexander Fritz²⁴, Rodrigo F. Haack¹⁷^,18, Fabio R. Herpich²⁵, E. Ibar¹⁴^,33, Ulrike Kuchner²⁶, Ivan Lacerna³, Amanda R. Lopes¹⁷^,18, Sebastian Lopez²⁷, Elismar Lösch⁶, Sean McGee²⁸, C. Mendes de Oliveira⁶, Lorenzo Morelli³, Alessia Moretti²⁹, Diego Pallero⁴^,33, Franco Piraino-Cerda⁴^,33, Emanuela Pompei³⁰, U. Rescigno³, Analía V. Smith Castelli¹⁷^,18, Rory Smith⁴^,33, Laerte Sodré Jr⁶ and Elmo Tempel³¹^,32

¹ Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile
² Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, 00560 Helsinki, Finland
³ Instituto de Astronomía y Ciencias Planetarias (INCT), Universidad de Atacama, Copayapu 485, Copiapó, Chile
⁴ Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile
⁵ Institute of Astrophysics, Facultad de Ciencias Exactas, Universidad Andrés Bello, Sede Concepción, Talcahuano, Chile
⁶ Departamento de Astronomia, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, São Paulo 05508-090, Brazil
⁷ Departamento de Astronomía, Universidad de La Serena, Avda. Raúl Bitrán 1305, La Serena, Chile
⁸ Instituto Multidisciplinario de Investigación y Postgrado, Raúl Bitrán, 1305 La Serena, Chile
⁹ INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Napoli, Italy
¹⁰ Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro, RJ, Brazil
¹¹ Observatório do Valongo, Ladeira Pedro Antônio, 43, Saúde, Rio de Janeiro, 20080-090 BR, Brazil
¹² Departamento de Física Teórica y del Cosmos, Edificio Mecenas, Campus Fuentenueva, Universidad de Granada, E-18071 Granada, Spain
¹³ Instituto Universitario Carlos I de Física Teórica y Computacional, Universidad de Granada, 18071 Granada, Spain
¹⁴ Instituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Valparaíso, Chile
¹⁵ Centre of Excellence for Data Science, Artificial Intelligence & Modelling, The University of Hull, Cottingham Road, Kingston-Upon-Hull HU6 7RX, UK
¹⁶ Consejo Nacional de Investigaciones Científicas y Técnicas, Ciudad Autónoma de Buenos Aires, Argentina
¹⁷ Instituto de Astrofísica de La Plata, CONICET-UNLP, Paseo del Bosque s/n, B1900FWA La Plata, Argentina
¹⁸ Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA La Plata, Argentina
¹⁹ INAF-IASF Milano, Via Alfonso Corti 12, 20133 Milano, Italy
²⁰ Max-Planck-Institut für Extraterrestrische Physik (MPE), Gießenbachstraße 1, D-85748 Garching bei München, Germany
²¹ Université Claude Bernard Lyon 1, IUF, IP2I Lyon, 4 Rue Enrico Fermi, 69622 Villeurbanne, France
²² Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom
²³ Korea Institute for Advanced Study, 85, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Republic of Korea
²⁴ Kuffner Observatory, Johann-Staud-Straße 10, 1160 Wien, Austria
²⁵ CASU, Institute of Astronomy, Cambridge, UK
²⁶ School of Physics, Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
²⁷ Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
²⁸ School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
²⁹ INAF-Padova Astronomical Observatory, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
³⁰ European Southern Observatory, Science Operations, Alonso de Cordova 3107, Vitacura, 19001 Santiago, Chile
³¹ Tartu Observatory, University of Tartu, Observatooriumi 1, Tõravere 61602, Estonia
³² Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia
³³ Millennium Nucleus for Galaxies (MINGAL), Valparaíso, Chile

^⋆ Corresponding author.

Received: 22 October 2024
Accepted: 26 March 2025

Abstract

CHANCES, the CHileAN Cluster galaxy Evolution Survey, will study the evolution of galaxies in and around 100 massive galaxy clusters from the local Universe out to z = 0.45, and two superclusters at z ∼ 0.05 that contain roughly 25 Abell clusters each. CHANCES will use the new 4MOST Spectroscopic Survey Facility on the VISTA 4m telescope to obtain spectra for ∼500 000 galaxies with magnitudes r_AB < 20.4, providing comprehensive spectroscopic coverage of each cluster out to 5r₂₀₀. Its wide and deep scope will trace massive and dwarf galaxies from the surrounding filaments and groups to the cores of galaxy clusters. This will enable the study of galaxy preprocessing and of the role of the evolving environment on galaxy evolution. In this paper, we present and characterise the sample of clusters and superclusters to be targeted by CHANCES. We used literature catalogues based on X-ray emission and the Sunyaev–Zel’dovich effect to define the cluster sample in a homogeneous way, with attention to cluster mass and redshift, as well as the availability of ancillary data. We calibrated literature mass estimates from various surveys against each other and provide an initial mass estimate for each cluster, which we used to define the radial extent of the 4MOST coverage. We also present an initial assessment of the structure surrounding these clusters based on the redMaPPer red-sequence algorithm as a preview of some of the science CHANCES will enable.

Key words: galaxies: clusters: general / galaxies: distances and redshifts / galaxies: evolution / large-scale structure of Universe

Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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