Targeting cluster galaxies for the 4MOST CHANCES Low- <i>z</i> sub-survey with photometric redshifts

Context. The evolution of galaxies is shaped by both internal processes and their external environments. Galaxy clusters and their surroundings provide ideal laboratories to study these effects, particularly with respect to mechanisms such as quenching and morphological transformation. The Chilean Cluster galaxy Evolution Survey (CHANCES) Low- z sub-survey is part of the CHileAN Cluster galaxy Evolution Survey, a 4MOST community survey designed to uncover the relationship between the formation and evolution of galaxies and hierarchical structure formation as it happens, through deep and wide multi-object spectroscopy. Aims. We present the target selection strategy followed to select galaxy cluster candidate members for the CHANCES Low- z sub-survey. The selection was focussed in and around 50 clusters and two superclusters at z &lt; 0.07, out to (5 × R 200 ) and down to m r = 20.4. Methods. Combining public photometric redshift estimates from the DESI Legacy Imaging Survey and T80S/S-PLUS iDR5 with custom photometric redshifts, we were able to identify likely galaxy cluster candidate members, whose photometric redshifts were consistent with being located at the known redshift of the cluster. We measured the average deviations of their photometric redshifts with respect to the spectroscopic redshift measurements, σ NMAD . We tested various selection parameters to maximise completeness, while maintaining purity. Results. We successfully compiled our CHANCES-low-redshift catalogues, split into three different sub-surveys: Low- z bright ( m r &lt; 18.5), Low- z faint (18.5 ≤ m r &lt; 20.4), and Low- z faint supplementary. To do so, we selected ≳500 000 galaxy cluster candidate members and included confirmed spectroscopic galaxy cluster members, from which we expect to obtain 4MOST low-resolution ( R ∼ 6500) spectra for ∼320 000 galaxies. Conclusions. The CHANCES Low- z target catalogues form a statistically robust sample for spectroscopic follow-up, enabling studies of galaxy evolution and environmental effects in nearby cluster and supercluster environments.

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Journal
Astronomy and Astrophysics
Published
2025-12-04
DOI
https://doi.org/10.1051/0004-6361/202556796
Primary Topic
Galaxies: Formation, Evolution, Phenomena
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article
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article

Targeting cluster galaxies for the 4MOST CHANCES Low- z sub-survey with photometric redshifts

V. Patricio Olivares, Círia Lima-Dias, Vinícius Lima, Elismar Lösch et al.
Astronomy and Astrophysics
Galaxies: Formation, Evolution, Phenomena
article

Targeting cluster galaxies for the 4MOST CHANCES Low- z sub-survey with photometric redshifts

V. Patricio Olivares, Círia Lima-Dias, Vinícius Lima, Elismar Lösch, Nicolás Tejos, Benedetta Vulcani, Simone A. Teixeira, L. Morelli, A. Finoguenov, Diego Pallero, F. Almeida-Fernandes, Cristina Mendes de Oliveira, Maciej Bilicki, Antonela Monachesi, E. Pompei, M. Argudo–Fernández, A.L. Figueiredo, Ulrike Kuchner, W. Schoenell, Julie Nantais, Vitor Hugo de Goes Sampaio, T. Ribeiro, S. Torres-Flores, G. D’Ago, R. J. C. Lopes, L. A. Gutiérrez-Soto, Hugo Méndez-Hernàndez, Clécio R. Bom, Sean McGee, Yara L. Jaffé, Ivan Lacerna, L. Nakazono, T. Santos-Silva, Sebastián López, P. Merluzzi, J. M. Sartori, G. B. Oliveira Schwarz, B.M. Amrutha, F. R. Herpich, R. Demarco, A. Kanaan, Viviana Castelli, A. Zenteno, Fiete Haack, Márcio S. Carvalho, A.D. E Lacerda, Franco Piraino-Cerda, Shuk Han Cheng, Paul Haines, Cristobal Sifón, Laerte Sodré, E. Ibar, Raúl Baier-Soto, M. Bianca Poggianti, F. Boudewijn Roukema, P. Jacob Crossett, H. Vitor Lopes-Silva
article en

Abstract

Context. The evolution of galaxies is shaped by both internal processes and their external environments. Galaxy clusters and their surroundings provide ideal laboratories to study these effects, particularly with respect to mechanisms such as quenching and morphological transformation. The Chilean Cluster galaxy Evolution Survey (CHANCES) Low- z sub-survey is part of the CHileAN Cluster galaxy Evolution Survey, a 4MOST community survey designed to uncover the relationship between the formation and evolution of galaxies and hierarchical structure formation as it happens, through deep and wide multi-object spectroscopy. Aims. We present the target selection strategy followed to select galaxy cluster candidate members for the CHANCES Low- z sub-survey. The selection was focussed in and around 50 clusters and two superclusters at z &lt; 0.07, out to (5 × R 200 ) and down to m r = 20.4. Methods. Combining public photometric redshift estimates from the DESI Legacy Imaging Survey and T80S/S-PLUS iDR5 with custom photometric redshifts, we were able to identify likely galaxy cluster candidate members, whose photometric redshifts were consistent with being located at the known redshift of the cluster. We measured the average deviations of their photometric redshifts with respect to the spectroscopic redshift measurements, σ NMAD . We tested various selection parameters to maximise completeness, while maintaining purity. Results. We successfully compiled our CHANCES-low-redshift catalogues, split into three different sub-surveys: Low- z bright ( m r &lt; 18.5), Low- z faint (18.5 ≤ m r &lt; 20.4), and Low- z faint supplementary. To do so, we selected ≳500 000 galaxy cluster candidate members and included confirmed spectroscopic galaxy cluster members, from which we expect to obtain 4MOST low-resolution ( R ∼ 6500) spectra for ∼320 000 galaxies. Conclusions. The CHANCES Low- z target catalogues form a statistically robust sample for spectroscopic follow-up, enabling studies of galaxy evolution and environmental effects in nearby cluster and supercluster environments.

Astronomy and AstrophysicsVol. 706
Université Claude Bernard Lyon 1 (FR), Universidade do Vale do Paraíba (BR), Centre National de la Recherche Scientifique (FR), Pontificia Universidad Católica de Valparaíso (CL), University of Helsinki (FI), University of Nottingham (GB), Valparaiso University (US), Consejo Nacional de Investigaciones Científicas y Técnicas (AR), Universidad de Granada (ES), Lyon College (US), Universidade de São Paulo (BR), Carnegie Institution for Science (US), University of Atacama (CL), Universidade Estadual de Feira de Santana (BR), University of Cambridge (GB), Observatoire de Lyon (FR), Center for Theoretical Physics (PL), Universidade Federal de Santa Catarina (BR), Valongo Observatory (BR), Universidade Politecnica (MZ), Universidad Internacional (MX), Galaxies, Etoiles, Physique et Instrumentation (FR), Exact Sciences (United States) (US), Instituto de Física La Plata (AR), Institute of Astronomy (RU), Centro Brasileiro de Pesquisas Físicas (BR), European Southern Observatory (CL), Nicolaus Copernicus Astronomical Center (PL), Cerro Tololo Inter-American Observatory (CL), NSF-DOE Vera C. Rubin Observatory (CL), Millennium Engineering and Integration (United States) (US), Nanjing Institute of Astronomical Optics & Technology (CN), Spanish National Observatory (ES), Instituto de Geofísica y Astronomía (CU), Laboratório Nacional de Astrofísica (BR), Osservatorio Astronomico di Padova (IT), National Astronomical Observatories (CN), Instituto de Astrofísica de La Plata, University of Chile (CL), University of La Serena (CL), Federico Santa María Technical University (CL), University of Birmingham (GB), Instituto Nacional de Pesquisas Espaciais (BR), Universidad Nacional de La Plata (AR), National Institute for Astrophysics (IT), Polish Academy of Sciences (PL)
Openalex Percentile: Top 74%
Galaxies: Formation, Evolution, Phenomena
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