Ni abundance in the core of the Perseus cluster: An answer to the significance of resonant scattering

摘要

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 Healpha 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 Healpha ratio, is no longer required. The absence of resonant scattering points toward the presence of significant gas motions ( either turbulent or laminar) in the core of the Perseus Cluster. [References: 36]