The inverse iron-bias in action in Abell 2028

Details The inverse iron-bias in action in Abell 2028 The inverse iron-bias in action in Abell 2028

2009-09-25

arxiv.org/abs/0909.4679v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

2 pages, 2 figures, to appear in proceedings of the conference "The Energetic Cosmos: from Suzaku to Astro-H", July 2009, Otar

Scientific paper

Recent work based on a global measurement of the ICM properties find evidence for an increase of the iron abundance in galaxy clusters with temperature around 2-4 keV. We have undertaken a study of the metal distribution in nearby clusters in this temperature range, aiming at resolving spatially the metal content of the ICM. The XMM observation of the first object of the sample, the cluster Abell 2028, reveals a complex structure of the cluster over scale of ~ 300 kpc, showing an interaction between two sub-clusters in a ``cometary'' configuration. We show that a naive one-component fit for the core of Abell 2028 returns a biased high metallicity. This is due to the inverse iron-bias, which is not related to the presence in the spectrum of both Fe-L and Fe-K emission lines but to the behavior of the fitting code in shaping the Fe-L complex of a one temperature component to adjust to the multi-temperature structure of the projected spectrum.

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