Binary Galaxies in the Local Supercluster and Its Neighborhood
I. D. Karachentsev, D. I. Makarov

TL;DR
This paper presents a catalog of 509 binary galaxy systems in the local supercluster, analyzing their properties, dynamics, and the prevalence of dwarf galaxy pairs, highlighting potential merging stages and the need for further HI radio studies.
Contribution
It introduces a new catalog of nearby binary galaxies with detailed properties and analyzes their dynamics, including a focus on dwarf galaxy pairs and their evolutionary stage.
Findings
Median velocity difference of 35 km/s among pairs
Median projected distance of 123 kpc for binary systems
Substantial fraction of dwarf galaxy pairs with small separations
Abstract
We report a catalog of 509 pairs identified among 10403 nearby galaxies with line-of-sight velocities V_LG < 3500 km/s.We selected binary systems in accordance with two criteria (bounding and temporal), which require the physical pair of galaxies to have negative total energy and its components to be located inside the zero-velocity surface. We assume that individual galaxy masses are proportional to their total K-band luminosities, M = L_K x 6M/L. The catalog gives the magnitudes and morphological types of galaxies and also the projected (orbital) masses and pair isolation indices. The component line-of-sight velocity differences and projected distances of the binary systems considered have power-law distributions with the median values of 35 km/s and 123 kpc, respectively. The median mass-to-K-band luminosity ratio is equal to 11 M/L, and its uncertainty is mostly due to the errors of…
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