EDP Sciences
Free access
Issue A&A
Volume 508, Number 2, December III 2009
Page(s) 565 - 574
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361/200912745
Published online 01 October 2009

A&A 508, 565-574 (2009)
DOI: 10.1051/0004-6361/200912745

Metal abundances in the cool cores of galaxy clusters

S. De Grandi1 and S. Molendi2

1  INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
    e-mail: sabrina.degrandi@brera.inaf.it
2  INAF – IASF Milano, via Bassini 15, 20133 Milano, Italy
    e-mail: silvano@iasf-milano.inaf.it

Received 22 June 2009 / Accepted 27 August 2009

Abstract
We use XMM-Newton data to carry out a detailed study of the Si, Fe and Ni abundances in the cool cores of a representative sample of 26 local clusters. We performed a careful evaluation of the systematic uncertainties related to the instruments, the plasma codes and the spectral modeling, finding that the major source of uncertainty is the plasma codes. Our Si, Fe, Ni, Si/Fe and Ni/Fe distributions feature only moderate spreads (from 20% to 30%) around their mean values strongly suggesting similar enrichment processes at work in all our cluster cores. Our sample-averaged Si/Fe ratio is comparable to those measured in samples of groups and high luminosity ellipticals, implying that the enrichment process in ellipticals, dominant galaxies in groups and BCGs in clusters is quite similar. Although our Si/Fe and Ni/Fe abundance ratios are fairly well constrained, the large uncertainties in the supernova yields prevent us from making a firm assessment of the relative contribution of type Ia and core-collapsed supernovae to the enrichment process. All that can be said with some certainty is that both contribute to the enrichment of cluster cores.



Key words: X-rays: galaxies: clusters -- galaxies: clusters: general -- supernovae: general -- galaxies: abundances -- cooling flows -- intergalactic medium



© ESO 2009

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)