2013/06/25 by M. Sereno, Mauro Sereno, G. Covone +1 · 2 citations
Environmental Science · Physics and Astronomy · #Astronomy #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Galaxy formation and evolution #Physics #Plant Water Relations and Carbon Dynamics #Redshift #Remote Sensing in Agriculture #Universe #astro-ph.CO
paper · pdf · doi:10.1093/mnras/stt1086
10 pages, 3 figures; in press on MNRAS
arxiv created 2013/06/25 · openalex publication_date 2013/07/10 · arxiv updated 2015/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Mass and concentration of clusters of galaxies are related and evolving with redshift. We study the properties of a sample of 31 massive galaxy clusters at high redshift, 0.8 ≲ z ≲ 1.5, using weak and strong lensing observations. Concentration is a steep function of mass, c200 ∝ M200−0.83 ± 0.39, with higher redshift clusters being less concentrated. Mass and concentration from the stacked analysis, M200 = (4.1 ± 0.4) × 1014 M⊙ h−1 and c200 = 2.3 ± 0.2, are in line with theoretical results extrapolated from the local Universe. Clusters with signs of dynamical activity preferentially feature high concentrations. We discuss the possibility that the whole sample is a mix of two different kinds of haloes. Overconcentrated clusters might be accreting haloes out of equilibrium in a transient phase of compression, whereas less concentrated ones might be more relaxed.