On the Iron content in rich nearby Clusters of Galaxies

By S. Grandi, S. Ettori, M. Longhetti, S. Molendi. 2003

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In this paper we study the iron content of a sample of 22 nearby hot clusters observed with BeppoSAX .W e fi nd that the global iron mass of clusters is tightly related to the cluster luminosity and that the relatively loose correlation between the iron mass and the cluster temperature follows from the combination of the iron mass vs. luminosity and luminosity vs. temperature correlations. The iron mass is found to scale linearly with the intracluster gas mass, implying that the global iron abundance in clusters is roughly constant. This result suggests that enrichment mechanisms operate at a similar rate in all clusters. By employing population synthesis and chemical enrichment models, we show that the iron mass associated with the abundance excess which is always found in the centre of cool core clusters can be entirely produced by the brightest cluster galaxy (BCG), which is always found at the centre of cool core clusters. The iron mass associated with the excess, the optical magnitude of the BCG and the temperature of the cluster are found to correlate with one another suggesting a link between the properties of the BCG and the hosting cluster. These observational facts lends strength to current formation theories which envisage a strong connection between the formation of the giant BCG and its hosting cluster.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/c27031b261a61dd79a3de0045736f5330e008e8a

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Citations in the corpus

Determination of the Cosmic Distance Scale from Sunyaev-Zel’dovich Effect and Chandra X-Ray Measurements of High-Redshift Galaxy Clusters (2005, result): “We assume the De Grandi et al. (2004) abundance profile in our analysis, which is consistent with our measured abundances.”
THE GALAXY CONTENT OF SDSS CLUSTERS AND GROUPS (2007, background): “…to properties of their host clusters (Sandage & Hardy 1973; Schneider et al. 1983; Schombert 1988; Edge & Stewart 1991; Brough et al. 2002; De Grandi et al. 2004; Brough et al. 2005; Loh & Strauss 2006), including to the masses of their parent halos (Lin & Mohr 2004; Mandelbaum et al. 2006;…”
K-band Properties of Galaxy Clusters and Groups: Brightest Cluster Galaxies and Intracluster Light (2004, background): “…of 22 clusters finds weak correlation between Lb and cluster temperature (Edge 1991), which we now know is a good proxy for cluster virial mass. Subsequent studies have confirmed these earlier findings (e.g., Fisher et al. 1995; Brough et al. 2002; De Grandi et al. 2004 and references therein).”
Simulating the effect of active galactic nuclei feedback on the metal enrichment of galaxy clusters (2009, background): “…relaxed “cool core” clusters, with central vues of ZFe approaching solar abundance and with a global enrichment at a level of about 1/3–1/2ZF e,⊙ (e.g.,De Grandi et al. 2004; Vikhlinin et al. 2005; de Plaa et al. 2006; Snowden et al. 2008; Leccardi & Molendi 2008a; see Mushotzky 2004; Werner et…”
Hydrodynamical simulations of cluster formation with central AGN heating (2005, result): “Therefore, our AGN heating prescription is qualitatively in good agreement with the metallicity gradients observed in cool core clusters (e.g. Böhringer et al. 2002, 2004; De Grandi et al. 2004).”
X-ray spectroscopy of galaxy clusters: studying astrophysical processes in the largest celestial laboratories (2009, background): “Based on the Fe abundance profiles, De Grandi et al. (2004) andBöhringer et al. (2004) concluded that the central abundance peak is due to the metals r leased by the stellar population of the cD galaxy.”
Chemical enrichment of galaxy clusters from hydrodynamical simulations (2007, background): “For instance, De Grandi et al. (2004) have shown that cool core clusters are characterized by a significant central enhancement of the iron abundance in the ICM, which closely correlates with the magnitude of the brightest cluster galaxies (BCGs) and the temperature of the cluster.”