Early-Type (E, S0) Galaxies in the Catalog of Isolated Galaxies (KIG)

We use the data of modern digital sky surveys (PanSTARRS-1, SDSS) combined with H I-line and far ultraviolet (GALEX) surveys to reclassify 165 early-type galaxies from the Catalog of Isolated Galaxies (KIG). As a result, the number of E- and S0-type galaxies reduced to 91. Our search for companions of early-type KIG galaxies revealed 90 companions around 45 host galaxies with line-of-sight velocity differences km s(-1) and linear projected separations R-p < 750 kpc. We found no appreciable differences in either integrated luminosity or color of galaxies associated with the presence or absence of close neighbors. We found a characteristic orbital mass-to-luminosity ratio for 26 systems "KIG galaxy-companion" to be M-circle dot/L-K = (74 +/- 26) M-circle dot/L-circle dot, which is consistent with the M-orb/L-K estimates for early-type isolated galaxies in the 2MIG catalog (63M(circle dot)/L-circle dot), and also with the estimates for E- and S0-type galaxies in the Local Volume: (NGC 3115), (NGC 5128), (NGC 4594). The high halo-to-stellar mass ratio for E- and S0-type galaxies compared to the average (20 +/- 3) M-circle dot/L-circle dot ratio for bulgeless spiral galaxies is indicative of a significant difference between the dynamic evolution of early- and late-type galaxies.