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Fig. 8


Distribution of the metal abundance of the ICM along the structure described in Fig. 7. (Left) Estimates along the regions labelled from 1 to 16. The apparently coherent structure corresponds to the regions between 4 and 14 (red points) where the measures of the metal abundance are systematically higher than the values measured in the surrounding gas by about 50%. The difference between the weighted averages of the abundance values along this structure and in the “off” region (a combination of “off1” and “off2” regions) used as reference is ~1.6σ when the scatter is considered (shaded region and dotted lines, respectively) and increases to 4.0σ when the error on the mean is used. The dimension of the elongated structure is about (3.2 × 1) arcmin2 ≈ (276 × 86) kpc2. (Right) Spectral measurements as function of the distance from the BCG. The measurements were done along two different directions, one along the elongated structure (red dots) and the other almost orthogonally to it (blue diamonds). The two values match at about 150 kpc. At the top, the excess in iron mass in unit of solar mass as a function of increasing radius is indicated. The elemental abundances are given with respect to the solar values from Anders & Grevesse (1989).

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