Physical properties of the X-ray gas as a dynamical diagnosis for galaxy clusters. (arXiv:1901.03851v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Lagana_T/0/1/0/all/0/1">T. F. Laganá</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Durret_F/0/1/0/all/0/1">F. Durret</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lopes_P/0/1/0/all/0/1">P. A. A. Lopes</a>
We analysed XMM-{it 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 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 cool-cores (CC) 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 cool-core. 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 cool-core 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.
We analysed XMM-{it 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 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 cool-cores (CC) 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 cool-core. 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 cool-core 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.
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