Distribution of Si, Fe, and Ni in the Intracluster Medium of the Coma Cluster

Abstract

We studied the distributions of Si, Fe, and Ni in the intracluster medium (ICM) of the Coma cluster, one of the largest clusters in the nearby universe, using XMM-Newton data up to 0.5 r180 and Suzaku data of the central region up to 0.16 r180. Using the flux ratios of Ly alpha of H-like Si and 7.8 keV blend to K alpha of He-like Fe, the abundance ratios of Si to Fe and Ni to Fe of the ICM were derived using APEC model v2.0.1. The Si/Fe ratio in the ICM of the Coma cluster shows no radial gradient. The emission weighted averages of the Si/Fe ratio in the ICM within 0.0--0.2 r180, 0.2--0.5 r180, and 0.0--0.5 r180 are 0.97 +- 0.11, 1.05 +- 0.36 and 0.99 +- 0.13, respectively, in solar units using the solar abundance of Lodders (2003). These values are close to those of smaller clusters and groups of galaxies. Using the Suzaku data of the central region, the derived Ni/Fe ratio of the ICM is 0.6--1.5 in solar units, according to the same solar abundance table. The systematic difference in the derived abundance ratios by different plasma codes are about 10%. Therefore, for the ICM in the Coma cluster, the abundance pattern of Si, Fe, and Ni is consistent with the same mixture of the yields of SN II and SN Ia in our Galaxy. Within 0.5 r180}, the cumulative iron-mass-to-light ratio increases with radius, and its radial profile is similar to those of relaxed smaller clusters with cD galaxies at their center. Considering the observed Si/Fe ratio, the cumulative metal-mass-to-light ratios at 0.5 r180 are compared with theoretical expectations.

10 pages, 7 figures, accepted for publication in PASJ

References in corpus (9)

• Stellar and total baryon mass fractions in groups and clusters since redshift 1
• Calibration of the galaxy cluster M_500-Y_X relation with XMM-Newton
• Chemical enrichment in the cluster of galaxies Hydra A
• Constraining supernova models using the hot gas in clusters of galaxies
• Temperature and abundance profiles of hot gas in galaxy groups - I. Results and statistical analysis
• Enrichment in the Centaurus cluster of galaxies
• Type Ia and II supernovae contributions to the metal enrichment in intra-cluster medium observed with Suzaku
• The abundance pattern of O, Mg, Si and Fe in the intracluster medium of the Centaurus cluster observed with XMM-Newton
• Morphology of galaxies in the Coma cluster region down to M_B=-14.25. I. A catalog of 473 members

Cited by in corpus (12)

• On the role of AGN feedback on the thermal and chemodynamical properties of the hot intra-cluster medium
• The uniformity and time-invariance of the intra-cluster metal distribution in galaxy clusters from the IllustrisTNG simulations
• The history of chemical enrichment in the intracluster medium from cosmological simulations
• The origin of ICM enrichment in the outskirts of present-day galaxy clusters from cosmological hydrodynamical simulations
• Enrichment of the hot intracluster medium: numerical simulations
• Tests of Gravity with Galaxy Clusters
• Chemical abundances in the outskirts of nearby galaxy groups measured with joint Suzaku and Chandra observations
• Metal distributions out to 0.5 r180 in the intracluster medium of four galaxy groups observed with Suzaku
• Testing a generalized cubic Galileon gravity model with the Coma Cluster
• Chemical enrichment in the cool core of the Centaurus cluster of galaxies
• Redshift evolution of the hot intracluster gas metallicity in the C-EAGLE cluster simulations
• Star Formation and Chemical Enrichment in Protoclusters