Detection of Filamentary X-Ray Structure in the Core of the Shapley Supercluster

Abstract

We report on X-ray observations of the core of the Shapley Supercluster. Combining data from pointed observations of the ROSAT PSPC detector and data from the ROSAT All-Sky Survey, the observed region covers an area of $6^{\circ }\times 3^{\circ }$. It contains the central clusters A3562, A3558 and A3556. We find clear evidence for X-ray emission connecting the three clusters. This confirms the existence of a filamentary, physical structure embedding the three clusters A3562, A3558 and A3556. We also find evidence for faint emission westwards of A3556. In total, the extension of the filamentary X-ray emission of the core of the Shapley Supercluster amounts up to at least $\sim 17.5h_{50}^{-1}$ Mpc. The total luminosity in the 0.1-2.4 keV energy band is $\sim 16\times 10^{44}{h}_{50}^{-2}$ erg s${}^{-1}$.

A&A in press, 8 pages, 5 figures

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