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 HI-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 $|dV| < 500$ 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
$M_{\odot}/L_{K} = (74\pm26) M_{\odot}/L_{\odot}$, which is consistent with the
$M_{\rm orb}/L_{K}$ estimates for early-type isolated galaxies in the 2MIG
catalog ($63 M_{\odot}/L_{\odot}$), and also with the $M_{\rm orb}/L_{K}$
estimates for E- and S0-type galaxies in the Local Volume: $38\pm22$ (NGC
3115), $82\pm26$ (NGC 5128), $65\pm20$ (NGC 4594). The high halo-to-stellar
mass ratio for E- and S0-type galaxies compared to the average $(20\pm3)
M_{\odot}/L_{\odot}$ ratio for bulgeless spiral galaxies is indicative of a
significant difference between the dynamic evolution of early- and late-type
galaxies.
