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The Shapley Supercluster. II. Spectroscopic observations in a wide area and general morphology
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abstract
We report 2868 new multi-object spectroscopic measurements of galaxy redshifts in an area roughly 12\deg$\times$ 6\deg (right ascension $\times$ declination) centered on the Shapley Supercluster (SSC). These correspond to 2627 different galaxies. Including other measurements reported in the literature, the total number of galaxies with measured redshifts in a 19\deg$\times$ 16\deg area centered on the supercluster now reaches 5090. Of these, 2949 lie in the redshift range 9,000 - 18,000 km s$^{-1}$, which we tentatively identify with the SSC. This unprecedented sample allows a quite detailed qualitative morphological study of the SSC. Based on the three-dimensional distribution of galaxies and clusters of galaxies, we identify several sub-condensations of the supercluster, as well as walls and filaments connecting them. We also find another supercluster in the background, at redshift $\sim$ 23,000 km s$^{-1}$.
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Cited by 1 Pith paper
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Redshift Dependence of $H_0$ Dipole in Pantheon+ Supernovae
A dipole in the locally measured Hubble constant appears at 2-3 sigma in the lowest-redshift Pantheon+ supernova bins, points near the Shapley supercluster and CMB dipole, and disappears for higher redshift thresholds.
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