Exploiting high-resolution NIKA2 data to study the intracluster medium and dynamical state of ACT-CL J0240.0+0116

It is crucial to have a detailed understanding of the intracluster medium (ICM) to infer precise cluster physics, such as the cluster’s dynamical state, in order to carry out cluster-based cosmological studies. This knowledge limits the accuracy and precision of mass estimation, which is a key parameter for such studies. In this paper, we conduct an in-depth analysis of cluster ACT-CL J0240.0+0116 using a multi-wavelength approach, with a primary focus on high angular resolution Sunyaev-Zeldovich (SZ) thermal component observations obtained under the New IRAM KIDs Array 2 (NIKA2) Sunyaev-Zeldovich Large Programme (LPSZ). We created composite images using NIKA2, X-ray, and optical galaxy number density maps. The results reveal distinct signs of disturbance within the cluster, with distributions of gas and member galaxies that do not overlap. We also found suggestions for an inflow of matter onto the cluster from the south-west direction. We classified the cluster as disturbed, using morphological indicators derived from its SZ, X-ray, and optical image. The SZ signal in the cluster is also contaminated by a strong central point source. We adopted different approaches to handling this contaminant and found that the estimates of our pressure and hydrostatic mass profiles are robust to the point source mitigation model. The hydrostatic mass of the cluster is estimated at 4.25 −0.45 +0.50 × 10 14 M ⊙ in the case where the point source was masked. These values are consistent with the mass estimated using only X-ray data and with the values from previous SZ studies of the Atacama Cosmology Telescope (ACT) survey, with improved precision on the mass estimate. Our findings strongly suggest that ACT-CL J0240.0+0116 is a disturbed cluster system, and the detailed observations and derived values serve as a compelling case study for the capabilities of the LPSZ in mapping the cluster ICM with high precision.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-04-22
DOI
https://doi.org/10.1051/0004-6361/202452597
Citations
2
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
2.31

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article

Exploiting high-resolution NIKA2 data to study the intracluster medium and dynamical state of ACT-CL J0240.0+0116

P. André, F. Ruppin, F. Kéruzoré, A. Maury et al.
2 citations
Astronomy and Astrophysics
Galaxies: Formation, Evolution, Phenomena
2.31
article

Exploiting high-resolution NIKA2 data to study the intracluster medium and dynamical state of ACT-CL J0240.0+0116

P. André, F. Ruppin, F. Kéruzoré, A. Maury, C. Hanser, O. Bourrion, B. Ladjelate, F.–X. Désert, A. Gómez, M de Petris, S. Doyle, A. Monfardini, M. Muñoz-Echeverría, G. Lagache, E. Artis, G. Ejlali, F. Mayet, H. Ajeddig, V. Revéret, C. Tucker, K. Schüster, A. Sievers, I. Bartalucci, A. Ritacco, S. Katsioli, C. Krämer, R. Adam, S. Leclercq, A. Ferragamo, L. Bing, Alexandre Benoît, Raphaël Wicker, R. Zylka, A. Beelen, É. Pointecouteau, S. Berta, J. Goupy, L. Perotto, A. Paliwal, Federico De Luca, A. Moyer-Anin, H. Roussel, G Pisano, P Ade, M. Calvo, A. Catalano, G. W. Pratt, N. Ponthieu, J.-F. Lestrade, J.-B. Mélin
article en
2 citations

Abstract

It is crucial to have a detailed understanding of the intracluster medium (ICM) to infer precise cluster physics, such as the cluster’s dynamical state, in order to carry out cluster-based cosmological studies. This knowledge limits the accuracy and precision of mass estimation, which is a key parameter for such studies. In this paper, we conduct an in-depth analysis of cluster ACT-CL J0240.0+0116 using a multi-wavelength approach, with a primary focus on high angular resolution Sunyaev-Zeldovich (SZ) thermal component observations obtained under the New IRAM KIDs Array 2 (NIKA2) Sunyaev-Zeldovich Large Programme (LPSZ). We created composite images using NIKA2, X-ray, and optical galaxy number density maps. The results reveal distinct signs of disturbance within the cluster, with distributions of gas and member galaxies that do not overlap. We also found suggestions for an inflow of matter onto the cluster from the south-west direction. We classified the cluster as disturbed, using morphological indicators derived from its SZ, X-ray, and optical image. The SZ signal in the cluster is also contaminated by a strong central point source. We adopted different approaches to handling this contaminant and found that the estimates of our pressure and hydrostatic mass profiles are robust to the point source mitigation model. The hydrostatic mass of the cluster is estimated at 4.25 −0.45 +0.50 × 10 14 M ⊙ in the case where the point source was masked. These values are consistent with the mass estimated using only X-ray data and with the values from previous SZ studies of the Atacama Cosmology Telescope (ACT) survey, with improved precision on the mass estimate. Our findings strongly suggest that ACT-CL J0240.0+0116 is a disturbed cluster system, and the detailed observations and derived values serve as a compelling case study for the capabilities of the LPSZ in mapping the cluster ICM with high precision.

Astronomy and AstrophysicsVol. 698
Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Institut d'Astrophysique de Paris (FR), École Normale Supérieure - PSL (FR), Astrophysique, Instrumentation et Modélisation (FR), Institut de Radioastronomie Millimétrique (FR), Laboratoire d’Astrophysique de Marseille (FR), Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères (FR), Institut de Planétologie et d'Astrophysique de Grenoble (FR), Lagrange Laboratory (FR), Château Gombert (FR), CEA Paris-Saclay (FR), Laboratoire de Physique de l'Ecole Normale Supérieure (FR), Laboratoire de Physique Subatomique et de Cosmologie (FR), Institut Néel (FR), Instituto de Radioastronomía Milimétrica (ES), Institute of Nuclear Physics of Lyon (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Institut de Recherche en Astrophysique et Planétologie (FR), Institut de Physique des 2 Infinis de Lyon (FR)
European Commission, Agence Nationale de la Recherche, Centre National d’Etudes Spatiales, Ministero dell’Istruzione, dell’Università e della Ricerca, Sapienza Università di Roma, Centre National de la Recherche Scientifique, HORIZON EUROPE Framework Programme, Institut National de Physique Nucléaire et de Physique des Particules
Openalex Percentile: Top 14%
Galaxies: Formation, Evolution, Phenomena
2.31
DOIOpen Access PDFOpenAlex
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