Issue |
A&A
Volume 487, Number 2, August IV 2008
|
|
---|---|---|
Page(s) | 461 - 466 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:200810113 | |
Published online | 09 June 2008 |
Radial metallicity profiles for a large sample of galaxy clusters observed with XMM-Newton
1
Università degli Studi di Milano, Dip. di Fisica, via Celoria 16, 20133 Milano, Italy
2
INAF - IASF Milano, via Bassini 15, 20133 Milano, Italy e-mail: leccardi@iasf-milano.inaf.ot
Received:
2
May
2008
Accepted:
4
June
2008
Aims. We measured radial metallicity profiles for a sample of ≈50 hot, intermediate redshift galaxy clusters, selected from the XMM-Newton archive.
Methods. As in our previous paper, we used background modeling rather than background subtraction, and the Cash statistic rather than the . This method requires a careful characterization of all background components. We also performed Montecarlo simulations to assess systematic effects.
Results. The mean metallicity profile shows a peak in the center, and gently declines out to 0.2 R180. Beyond 0.2 R180 the metallicity is ≈0.2 solar and, at variance with recently published expectations based on simulations, consistent with being flat. We find no evidence of profile evolution from to
. When comparing our mean profile to those obtained by recent works with BeppoSAX
and Chandra, we find remarkable agreement over the entire radial range.
Key words: X-rays: galaxies: clusters / galaxies: clusters: general / cosmology: observations
© ESO, 2008
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