CHEX-MATE: Exploring the kinematical properties of Planck galaxy clusters

We analysed the kinematical properties of the CHEX-MATE galaxy cluster sample. Our study is based on the radial velocities retrieved from the SDSS DR18, DESI, and NED spectroscopic databases and new data obtained with the 10.4 m GTC and ESO-NTT telescopes. We derived cluster mass profiles for 75 clusters using the MG-MAMPOSST procedure, which recovers the gravitational potential and the anisotropy profiles from line-of-sight velocities and projected positions of galaxy members. The standard Navarro–Frenk–White (NFW) model and the Burkert model, with flatter cores than the NFW, both adequately fit the kinematic data, with only a marginal statistical preference for one model over the other. An estimation of the mass bias (1− B 1 ) = M 500 SZ / M 500 M was performed via a comparison with Sunyaev-Zel’dovich–X-ray-calibrated mass estimates, resulting in a value of 0.54 ± 0.11 when four evidently disturbed clusters are removed from the sample. We assessed the dynamical state of the clusters by inferring the Anderson-Darling coefficient ( A 2 ) and the fraction of galaxies in substructures ( f sub ). Except for a few cases, we find relatively low values for A 2 , which suggests that CHEX-MATE clusters are not too far from relaxation. Moreover, no significant trends emerge between A 2 and f sub , nor between the log-masses estimated by MG-MAMPOSST and those based on the Sunyaev–Zel’dovich effect calibrated through X-rays measurements. We studied the concentration–mass relation for the sample; despite the large scatter, we observe signs of an increasing trend for high-mass clusters, in agreement with recent theoretical expectations. Finally, our analysis of the radial anisotropy profiles of member galaxies – stacked in five bins of mass and redshift – reveals that orbits tend to be isotropic at the centre and more radial towards the edge, as found in previous studies. A slight trend of increasing radial orbits at r 200 is observed in clusters with larger velocity dispersions.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-05-30
DOI
https://doi.org/10.1051/0004-6361/202555417
Citations
2
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
2.31

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article

CHEX-MATE: Exploring the kinematical properties of Planck galaxy clusters

L. Lovisari, Elena Rasia, M. Radovich, Lorenzo Pizzuti et al.
2 citations
Astronomy and Astrophysics
Galaxies: Formation, Evolution, Phenomena
2.31
article

CHEX-MATE: Exploring the kinematical properties of Planck galaxy clusters

L. Lovisari, Elena Rasia, M. Radovich, Lorenzo Pizzuti, A. Cappi, R. Barrena, A. Ferragamo, D. Eckert, R. Gavazzi, Megan Donahue, M. Sereno, É. Pointecouteau, F. Gastaldello, G. Castignani, Scott T. Kay, Jack Sayers, S. Ettori, Sophie Maurogordato, Paul Haines, A. Streblyanska, J. Ben Maughan, W. Gabriel Pratt
article en
2 citations

Abstract

We analysed the kinematical properties of the CHEX-MATE galaxy cluster sample. Our study is based on the radial velocities retrieved from the SDSS DR18, DESI, and NED spectroscopic databases and new data obtained with the 10.4 m GTC and ESO-NTT telescopes. We derived cluster mass profiles for 75 clusters using the MG-MAMPOSST procedure, which recovers the gravitational potential and the anisotropy profiles from line-of-sight velocities and projected positions of galaxy members. The standard Navarro–Frenk–White (NFW) model and the Burkert model, with flatter cores than the NFW, both adequately fit the kinematic data, with only a marginal statistical preference for one model over the other. An estimation of the mass bias (1− B 1 ) = M 500 SZ / M 500 M was performed via a comparison with Sunyaev-Zel’dovich–X-ray-calibrated mass estimates, resulting in a value of 0.54 ± 0.11 when four evidently disturbed clusters are removed from the sample. We assessed the dynamical state of the clusters by inferring the Anderson-Darling coefficient ( A 2 ) and the fraction of galaxies in substructures ( f sub ). Except for a few cases, we find relatively low values for A 2 , which suggests that CHEX-MATE clusters are not too far from relaxation. Moreover, no significant trends emerge between A 2 and f sub , nor between the log-masses estimated by MG-MAMPOSST and those based on the Sunyaev–Zel’dovich effect calibrated through X-rays measurements. We studied the concentration–mass relation for the sample; despite the large scatter, we observe signs of an increasing trend for high-mass clusters, in agreement with recent theoretical expectations. Finally, our analysis of the radial anisotropy profiles of member galaxies – stacked in five bins of mass and redshift – reveals that orbits tend to be isotropic at the centre and more radial towards the edge, as found in previous studies. A slight trend of increasing radial orbits at r 200 is observed in clusters with larger velocity dispersions.

Astronomy and AstrophysicsVol. 699
Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Institut d'Astrophysique de Paris (FR), Astrophysique, Instrumentation et Modélisation (FR), Laboratoire d’Astrophysique de Marseille (FR), Lagrange Laboratory (FR), Château Gombert (FR), CEA Paris-Saclay (FR), Institut de Recherche en Astrophysique et Planétologie (FR)
National Science Foundation, National Aeronautics and Space Administration, Ministerio de Ciencia, Innovación y Universidades, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Centre National d’Etudes Spatiales, Nuclear Safety and Security Commission, Agencia Nacional de Investigación y Desarrollo, Instituto de Astrofísica de Canarias, Institut sur la Nutrition et les Aliments Fonctionnels, Science and Technology Facilities Council, Horizon 2020, Astrophysics Division
Openalex Percentile: Top 12%
Galaxies: Formation, Evolution, Phenomena
2.31
DOIOpen Access PDFOpenAlex
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