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The Prevalence of Cooling Cores in Clusters of Galaxies at z~0.15-0.4 | | F. E. Bauer
; A. C. Fabian
; J. S. Sanders
; S. W. Allen
; R. M. Johnstone
; | | Date: |
10 Mar 2005 | | Journal: | Mon.Not.Roy.Astron.Soc. 359 (2005) 1481-1490 | | Subject: | astro-ph | | Affiliation: | Columbia), A. C. Fabian (IoA, Cambridge), J. S. Sanders (IoA, Cambridge), S. W. Allen (Kavi Inst., Stanford), and R. M. Johnstone (IoA, Cambridge | | Abstract: | We present a Chandra study of 38 X-ray luminous clusters of galaxies in the ROSAT Brightest Cluster Sample (BCS) that lie at z~0.15-0.4. We find that the majority of clusters at moderate redshift generally have smooth, relaxed morphologies with some evidence for mild substructure perhaps indicative of recent minor merger activity. Using spatially-resolved spectral analyses, cool cores appear to still be common at these redshifts. At a radius of 50 kpc, we find that at least 55 per cent of the clusters in our sample exhibit signs of mild cooling [t(cool)<10 Gyr], while in the central bin at least 34 per cent demonstrate signs of strong cooling [t(cool)<2 Gyr]. These percentages are nearly identical to those found for luminous, low-redshift clusters of galaxies, suggesting little evolution in cluster cores since z~0.4 and that heating and cooling mechanisms may already have stabilised by this epoch. Comparing the central cooling times to central Halpha emission in BCS clusters, we find a strong correspondence between the detection of Halpha and central cooling time. (Abridged) | | Source: | arXiv, astro-ph/0503232 | | Services: | Forum | Review | PDF | Favorites | |
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