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Title: A uniform metallicity in the outskirts of massive, nearby galaxy clusters

Suzaku measurements of a homogeneous metal distribution of Z ~ 0:3 Solar in the outskirts of the nearby Perseus cluster suggest that chemical elements were deposited and mixed into the intergalactic medium before clusters formed, likely over 10 billion years ago. A key prediction of this early enrichment scenario is that the intracluster medium in all massive clusters should be uniformly enriched to a similar level. Here, we confirm this prediction by determining the iron abundances in the outskirts (r > 0:25r200) of a sample of ten other nearby galaxy clusters observed with Suzaku for which robust measurements based on the Fe-K lines can be made. Across our sample the iron abundances are consistent with a constant value, ZFe = 0:316 ± 0:012 Solar (Χ 2 = 28:85 for 25 degrees of freedom). This is remarkably similar to the measurements for the Perseus cluster of ZFe = 0:314±0:012 Solar, using the Solar abundance scale of Asplund et al. (2009).
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. Stanford Univ., CA (United States)
  2. Masaryk Univ (Czech Republic); Hiroshima Univ. (China); MTA-Eotvos University Lendulet Hot Universe Research Group, Budapest (Hungary)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  4. Inst. of Space and Astronautical Science (ISAS) (Japan)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 470; Journal Issue: 4; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; clusters: intracluster medium; galaxies: X-rays: galaxies: clusters
OSTI Identifier:
1390597