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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Physical properties of the X-ray gas as a dynamical diagnosis for galaxy clusters

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Lagana, T. F. [1] ; Durret, F. [2] ; Lopes, P. A. A. [3]
Total Authors: 3
[1] Univ Cruzeiro Sul, NAT, Rua Galvao Bueno 868, BR-01506000 Sao Paulo, SP - Brazil
[2] Sorbonne Univ, CNRS, UMR 7095, Inst Astrophys Paris, 98bis Bd Arago, F-75014 Paris - France
[3] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, RJ - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 484, n. 2, p. 2807-2830, APR 2019.
Web of Science Citations: 3

We analysed XMM - Newton EPIC data for 53 galaxy clusters. Through 2D spectral maps, we provide the most detailed and extended view of the spatial distribution of temperature (kT), pressure (P), entropy (S), and metallicity (Z) of galaxy clusters to date with the aim of correlating the dynamical state of the system to six cool-core (CC) diagnoses from the literature. With the objective of building 2D maps and resolving structures in kT, P, S, and Z, we divide the data in small regions from which spectra can be extracted. Our analysis shows that when clusters are spherically symmetric the CCs are preserved, the systems are relaxed with little signs of perturbation, and most of the CC criteria agree. The disturbed clusters are elongated, show clear signs of interaction in the 2D maps, and most do not have a CC. However, 16 well-studied clusters classified as CC by at least four criteria show spectral maps that appear disturbed. All of these clusters but one show clear signs of recent mergers, with a complex structure and geometry but with a CC that remains preserved. Thus, although very useful for CC characterization, most diagnoses are too simplistic to reproduce the overall structure and dynamics of galaxy clusters, and therefore the selection of relaxed systems according to these criteria may affect mass estimates. The complex structure of galaxy clusters can be reliably assessed through the 2D maps presented here. (AU)

FAPESP's process: 18/02626-8 - X-ray astronomy: the history of chemical enrichment of groups and clusters of galaxies
Grantee:Tatiana Ferraz Laganá
Support type: Regular Research Grants