Ni abundance in the core of the Perseus Cluster: an answer to the significance of resonant scattering

Details Ni abundance in the core of the Perseus Cluster: an answer to the significance of resonant scattering Ni abundance in the core of the Perseus Cluster: an answer to the significance of resonant scattering

2003-09-22

arxiv.org/abs/astro-ph/0309582v1

Astrophys.J.600:670-680,2004

Astronomy and Astrophysics

Astrophysics

29 pages, 10 bw figures, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/379970

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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