X-ray measurement of the elemental abundances at the outskirts of the
  Perseus cluster with Suzaku
  We report on the abundance of metals (Mg and Fe) in the intracluster medium
(ICM) at the outskirts (0.2 r200 - 0.8 r200) of the Perseus cluster. The X-ray
spectra were obtained in the Suzaku/XIS mapping observations of this region. We
employ single temperature models to fit all the X-ray spectra. The ICM
temperature smoothly decreases toward the outer region from 6 keV to 4 keV. The
Fe abundance is uniformly distributed at the outskirts (~0.3 solar). The Mg
abundance is ~1 solar at the outskirts. The solar ratios of Mg/Fe of the
outskirts region (Mg/Fe ~4) are a factor of 4 larger than those of the central
region. Various systematic effects, including the spatial fluctuations in the
cosmic X-ray background, are taken into account and evaluated. These our
results have not changed significantly.
