Abstract
We present a database and catalogue of radial velocities of galaxies towards the region of the Shapley Supercluster (SSC) based on 18 129 measured velocities for 10 702 galaxies in the approximately 300 square degree area between 12h43m00s < RA < 14h17m00s and −23° 30′00″ > Dec > − 38° 30′00″. The database contains velocity measurements that have been reported in the literature up until 2015. It also includes 5084 velocities, corresponding to 4617 galaxies, observed by us at Las Campanas Observatory and Cerro Tololo Inter-American Observatory, which had not been reported individually until now. Of the latter, 2585 correspond to galaxies with no other previously published velocity measurement before 2015. Every galaxy in the velocity database has been identified with a galaxy extracted from the SuperCOSMOS photometric catalogues. We also provide a combined average velocity catalogue for all 10 702 galaxies with measured velocities, adopting the SuperCOSMOS positions as a homogeneous base. A general magnitude cut-off at R2 = 18.0 mag was adopted (with exceptions only for some of the new reported velocities). In general terms, we confirm the overall structure of the SSC as reported in earlier papers. However, the more extensive velocity data show finer structures, which is to be discussed in a future publication.
Highlights
Superclusters of galaxies are the largest structures that can be identified in large redshift surveys of galaxies or in catalogues of clusters of galaxies, of sizes ∼100 Mpc
We studied the completeness of the galaxy survey by comparing our velocity catalogue to the overlapping region of the SuperCOSMOS catalogue (SASSSG) of all galaxies extracted to the same magnitude depth
We present a catalogue containing 18 129 velocities for 10 702 galaxies in the area of the Shapley Supercluster (SSC) by combining existing measurements from the literature with 5084 new velocities for 2585 new galaxies observed by us at Las Campanas Observatory (LCO) and Cerro-Tololo Interamerican Observatory (CTIO)
Summary
Superclusters of galaxies are the largest structures that can be identified in large redshift surveys of galaxies or in catalogues of clusters of galaxies, of sizes ∼100 Mpc. It is an interesting laboratory to understand the interactions between clusters of galaxies, as well as the evolution of galaxies in high-density regions, but before falling into clusters (Merluzzi et al 2013, 2016) For such applications, it is necessary to accurately characterise the structure and dynamics of the supercluster, in order to measure its total mass and density distribution and assess the evolutionary state of its different regions. It is necessary to accurately characterise the structure and dynamics of the supercluster, in order to measure its total mass and density distribution and assess the evolutionary state of its different regions This requires large redshift surveys, which have been carried out over the years (Quintana et al 2000; Proust et al 2006; Haines et al 2018, and references therein). 1 http://www-wfau.roe.ac.uk/sss/index.html describes the observed galaxy density, velocity distribution, and general structure of the supercluster
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