2007/05/25 by A. Baldi, S. Ettori, P. Mazzotta +2
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Cluster (spacecraft) #Core (optical fiber) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Metallicity #Optics #Physics #Power law #Redshift #Statistics #Stellar, planetary, and galactic studies #Universe #astro-ph
paper · pdf · doi:10.1086/520505
published as Astrophys.J.666:835-845,2007 · 12 pages, 6 figures, Accepted for publication by the Astrophysical Journal
arxiv created 2007/05/25 · openalex publication_date 2007/08/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present an analysis of the temperature and metallicity profiles of 12 galaxy clusters in the redshift range 0.1-0.3 selected from the Chandra archive with at least ~20,000 net ACIS counts and kT > 6 keV. We divide the sample between seven cooling-core (CC) and five non-cooling-core (NCC) clusters according to their central cooling time. We find that single power laws can properly describe both the temperature and metallicity profiles at radii larger than 0.1 r 180 in both CC and NCC systems, with NCC objects showing steeper profiles outward. A significant deviation is present only in the inner 0.1 r 180 . We perform a comparison of our sample with the De Grandi & Molendi BeppoSAX sample of local CC and NCC clusters, finding a complete agreement in the CC cluster profile and a marginally higher value (at ~1 σ) in the inner regions of the NCC clusters. The slope of the power law describing kT ( r ) within 0.1 r 180 correlates strongly with the ratio between the cooling time and the age of the universe at the cluster redshift, with a slope >0 and τ c /τ age ≲ 0.6 in CC systems.