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26 April 2024 |
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X-ray Shapes of Distant Clusters: the Connection to Blue Galaxy Fractions | | Q. Daniel Wang
; Melville P. Ulmer
; | | Date: |
6 Feb 1997 | | Subject: | astro-ph | | Abstract: | Based on ROSAT PSPC pointed observations, we have determined the aggregate X-ray shapes of 10 distant (z = 0.17-0.54) rich clusters: A2397, A222, A520, A1689, A223B, A1758, A2218, A2111, A2125, and CL0016+16. Four of the clusters have global X-ray ellipticities greater than 0.2, as measured on a scale of diameter 3 h_{50}^{-1} Mpc. These strongly elongated clusters tend to show substantial amounts of substructure, indicating that they are dynamically young systems. Most interestingly, the global X-ray ellipticities of the clusters correlate well with their blue galaxy fractions; the correlation coefficient is 0.75 with a 90% confidence range of 0.44-0.92. This correlation suggests that blue cluster galaxies originate in the process of cluster formation, and that the blue galaxy proportion of a cluster decreases as the intracluster medium relaxes onto equipotential surfaces. | | Source: | arXiv, astro-ph/9702069 | | Services: | Forum | Review | PDF | Favorites | |
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