Metal abundances in the ICM associated with a medium-redshift cluster of galaxies MS 1512.4+3647 observed with Suzaku .
Abstract
We observed a medium-redshift cluster of galaxies MS 1512.4+3647 (z=0.37) with Suzaku for 209 ks. ASCA observation reported that MS 1512.4+3647 is rather bright in X-rays and that the ICM temperature is low (2.85 keV) with high metal abundance (1.1 solar). Therefore, MS 1512.4+3647 is one of the best targets to detect metal abundances not only for Fe but also for alpha elements. Thanks to the stable and low background level of Suzaku XIS, emission lines from highly ionized ions such as Ne, Mg, Si, S, Fe and Ni were significantly detected. Using a thin thermal plasma model, the abundances of these elements are determined with uncertainties less than 50%. This is one of the first results of abundance determination for alpha elements in the ICM associated with medium-redshift clusters. The abundance ratio relative to Fe is consistent with low-redshift clusters. Implications for metal enrichment history of this cluster will be discussed.
- Publication:
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Memorie della Societa Astronomica Italiana
- Pub Date:
- 2013
- Bibcode:
- 2013MmSAI..84..756S
- Keywords:
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- galaxies: clusters: individual (MS 1512.4+3647);
- X-rays: galaxies: clusters;
- X-rays: ICM