NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T21:45:20 PDT
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For refcode 1998MNRAS.297L..63A:
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Copyright by Royal Astronomical Society. 1998MNRAS.297L..63A The relationship between cooling flows and metallicity measurements for X-ray-luminous clusters S. W. Allen and A. C. Fabian Accepted 1998 April 23. Received 1998 April 22; in original form 1997 December 4 ABSTRACT We explore the relationship between the metallicity of the intracluster gas in clusters of galaxies, determined by X-ray spectroscopy, and the presence of cooling flows. Using ASCA spectra and ROSAT images, we demonstrate a clear segregation between the metallicities of clusters with and without cooling flows. On average, cooling-flow clusters have an emission-weighted metallicity a factor ~1.8 times higher than that of non-cooling-flow systems. We suggest that this is caused by the presence of metallicity gradients in the cooling-flow clusters, coupled with the sharply peaked X- ray surface brightness profiles of these systems. Non-cooling-flow clusters have much flatter X-ray surface brightness distributions and are thought to have undergone recent merger events, which may have mixed the central high- metallicity gas with the surrounding less metal-rich material. We find no evidence for evolution in the emission-weighted metallicities of clusters within z ~ 0.3. Key words: galaxies: clusters: general - cooling flows - intergalactic medium - X-rays: galaxies.
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