Kinematic analysis of a sample of X-ray luminous distant galaxy clusters

Author(s)
A. Nastasi, Hans Böhringer, R. Fassbender, A. de Hoon, Lamer Lamer, J.J. Mohr, N. Padilla, G.W. Pratt, H. Quintana, P. Rosati, J.S. Santos, A.D. Schwope, Šuhada R., Miguel Anibal Verdugo Olivares
Abstract

Aims. Observations and cosmological simulations show galaxy clusters as a family of nearly self-similar objects with properties that can be described by scaling relations as a function of mass and time. Here we study the scaling relations between the galaxy velocity dispersion (σ

v) and X-ray quantities, such as X-ray bolometric luminosity (L

Bol

X,500) and temperature (T

X) in galaxy clusters at high redshifts (0.64 ≤ z ≤ 1.46). We also compare our results with the analogous study of the local HIFLUGCS sample. Methods. For the analysis, we use a set of 15 distant galaxy clusters extracted from the literature and selected via different methods. We also use a sample of ten newly discovered clusters selected via their X-ray emission by the XMM-Newton Distant Cluster Project (XDCP), with more than ten confirmed spectroscopic members per cluster. For both samples, the same method was used to determine σ

v. We also study the evolution of this scaling relation by comparing the high redshift results with the data from the HIFLUGCS sample, which is taken as a representative of the conditions in the local Universe. For such an analysis, we restrict the study to the clusters in the common L

Bol

X,500 range. We also investigate the L

X - T

X and the σ

v - T

X relations for the 15 clusters from the literature sample. Results. We report the results of the X-ray and kinematic analysis of ten newly detected high redshift clusters and provide their spectroscopic and kinematic details. For the entire distant sample, we find a slope fully consistent with the one typical of local clusters, albeit with a large associated uncertainty (~26%). We repeat the fit by freezing the slope to the value found for the HIFLUGCS systems restricted to the same luminosity range as our sample to investigate the evolution of the amplitude alone.We find a positive offset of ΔA/A = 0.44 ± 0.22 if the self-similar evolution is neglected, hence indicating the possible need for including evolutionary effects. However, the L

X - T

X relation is found to be in good agreement with the local relation without any significant redshift evolution. Finally, the σ

v - T

X relation appears to slightly deviate from the theoretical expectation that galaxies and gas particles have a similar specific kinetic energy. However, the associated uncertainty is currently too large for making any conclusive statement in this regard.

Organisation(s)
Department of Astrophysics
External organisation(s)
Ludwig-Maximilians-Universität München, Max-Planck-Institut für extraterrestrische Physik, Leibniz-Institut für Astrophysik Potsdam, Pontificia Universidad Católica de Chile, French Alternative Energies and Atomic Energy Commission (CEA), Universitá degli studi di Ferrara
Journal
Astronomy & Astrophysics
Volume
564
No. of pages
23
ISSN
0004-6361
DOI
https://doi.org/10.1051/0004-6361/201322321
Publication date
11-2013
Peer reviewed
Yes
Austrian Fields of Science 2012
103003 Astronomy, 103004 Astrophysics
Keywords
ASJC Scopus subject areas
Astronomy and Astrophysics, Space and Planetary Science
Portal url
https://ucrisportal.univie.ac.at/en/publications/f7e7d61c-a728-4066-aef9-7ab31153ff89