X-ray measurement of the elemental abundances at the outskirts of the Perseus cluster with Suzaku. (arXiv:1211.4712v1 [astro-ph.CO]):
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.
No comments:
Post a Comment