Ni Abundance in the Core of the Perseus Cluster: An Answer to the Significance of Resonant Scattering

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Abstract
Using an XMM-Newton observation of the Perseus cluster we show that the excess in the flux of the 7-8 keV line complex previously detected by ASCA and BeppoSAX is due to an overabundance of Nickel rather than to an anomalously high Fe He$\beta$/Fe He$\alpha$ ratio. This observational fact leads to the main result that resonant scattering, which was assumed to be responsible for the supposed anomalous Fe He$\beta$/Fe He$\alpha$ ratio, is no longer required. The absence of resonant scattering points towards the presence of significant gas motions (either turbulent or laminar) in the core of the Perseus cluster.
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