The inverse iron-bias in action in Abell 2028 - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: Recent work based on a global measurement of the ICM properties find evidencefor an increase of the iron abundance in galaxy clusters with temperaturearound 2-4 keV. We have undertaken a study of the metal distribution in nearbyclusters in this temperature range, aiming at resolving spatially the metalcontent of the ICM. The XMM observation of the first object of the sample, thecluster 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 Abell2028 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-Kemission lines but to the behavior of the fitting code in shaping the Fe-Lcomplex of a one temperature component to adjust to the multi-temperaturestructure of the projected spectrum.



Autor: Fabio Gastaldello, Stefano Ettori, Italo Balestra, Fabrizio Brighenti, David Buote, Sabrina De Grandi, Myriam Gitti, Paolo Tozzi

Fuente: https://arxiv.org/







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