Does the Corona Borealis Supercluster form a giant binary-like system?

Abstract

The distribution of local gravitational potentials generated by a complete volume-limited sample of galaxy groups and clusters filling the Corona Borealis region has been derived to search for new gravitational hints in the context of clustering analysis unrevealed by alternative methodologies. Mapping such a distribution as a function of spatial positions, the deepest potential wells in the sample trace unambiguously the locations of the densest galaxy cluster clumps providing the physical keys to bring out gravitational features connected to the formation, composition and evolution of the major clustered structures filling that region. As expected, the three deepest potential wells found at Equatorial coordinates: (~ 230°, ~ 28°, z ~ 0.075), (~ 240°, ~ 27°, z ~ 0.09) and, (227°, 5.8°, z ~ 0.0788) correspond to massive superclusters of galaxy groups and clusters identified as the Corona Borealis, A2142 and Virgo-Serpent, respectively. However, the deepest isopotential contours around the Corona Borealis and A2142 superclusters seem to suggest a gravitational feature similar to a giant binary-like system connected by a filamentary structure. To a first approximation, it seems unlikely that this hypothesized system could be gravitationally bound.

Peculiar Motions of Galaxy Clusters in the Regions of Superclusters of galaxies

“…To explain the observed peculiar velocities of other members of galaxy systems, there are two variants: the collapsing central region of CrB consisting of A 2056, A 2061 A 2065, A 2067, A 2089 and, possibly, A 2092 [7] and the motion of the remotest galaxy clusters A 2019, A 2061, and CL 1529+29 toward the galaxy supercluster with A 2142. The A 2142 cluster that is 50 Mpc distant from the A 2061 cluster, in its turn, moves toward the CrB supercluster which confirms the presence of a gravitational interaction of these galaxy cluster systems [8].…”

“…The A 2142 cluster has a negative peculiar velocity 2.6 times exceeding the error, i.e, the cluster is possibly moving toward the supercluster to CrB. Thus, the gravitational interaction of large galaxy cluster systems of the CrB supercluster and the supercluster with A 2142 [8] is confirmed.…”

“…However, as the richest cluster in CrB A 2065 does not have a peculiar velocity (Table 2), then one can suppose that the most remote clusters in CrB with great positive peculiar velocities, A 2019, A 2061, and CL 1529+29, move toward the massive galaxy supercluster having A 2142 along the filament connecting them [8]. It was found using the SDSS DR8 and DR10 data that this supercluster with the center in A 2142 is a supercluster with the collapsing core [16].…”

“…A study of the gravitational potential distribution from the SDSS (DR10) data in the CrB region revealed two deep potential wells that correspond to galaxy clusters systems at z ∼ 0.074 and z ∼ 0.09: one system is near the CrB supercluster, in another system there is the very rich A 2142 cluster [8]. The mass of the system with A 2142 determined with the virial theorem 1.4 times exceeds the mass of the system with CrB.…”