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http://hdl.handle.net/20.500.12386/29204
Titolo: | Spatial distribution of metals in the ICM: evolution of the iron excess in relaxed galaxy clusters | Autori: | LIU, ANG TOZZI, Paolo Yu, Heng DE GRANDI, Sabrina ETTORI, STEFANO |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 481 | Fascicolo: | 1 | Da pagina:: | 361 | Abstract: | We investigate the spatial distribution of iron in the intracluster medium (ICM) in a selected sample of 41 relaxed clusters in the redshift range 0.05 < z < 1.03 using Chandra archival data. We compute the azimuthally averaged, deprojected Z<SUB>Fe</SUB> profile of each cluster out to ∼0.4r<SUB>500</SUB>, and identify a peak in the distribution of iron followed by a flatter distribution at larger radii. Due to the steep gradient both in gas density and abundance, we find that the emission-weighted iron abundance within 0.2r<SUB>500</SUB>, which entirely includes the iron peak in most of the cases, is on average ∼25 per cent higher than the mass-weighted value, showing that spatially resolved analysis and accurate deprojection are key to study the evolution of iron enrichment in the very central regions of cool-core clusters. We quantify the extent of the iron distribution in each cluster with a normalized scale parameter r<SUB>Fe</SUB>, defined as the radius where the iron abundance excess is half of its peak value. We find that r<SUB>Fe</SUB> increases by a factor of ∼3 from z ∼ 1 to z ∼ 0.1, suggesting that the spatial distribution of iron in the ICM extends with time, possibly due to the mixing with the mechanical-mode feedback from the central galaxy. We also find that the iron mass excess within 0.3r<SUB>500</SUB>, when normalized to the total baryonic mass within the same region, does not evolve significantly, showing that this iron mass component is already established at z ∼ 1. | URI: | http://hdl.handle.net/20.500.12386/29204 | URL: | https://academic.oup.com/mnras/article/481/1/361/5078375 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty2294 | Bibcode ADS: | 2018MNRAS.481..361L | Fulltext: | open |
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