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

Abstract

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 $M_{\odot }/L_K=(74\pm 26)M_{\odot }/L_{\odot }$, which is consistent with the $M_{\mathrm{orb}}/L_K$ estimates for early-type isolated galaxies in the 2MIG catalog ($63M_{\odot }/L_{\odot }$), and also with the $M_{\mathrm{orb}}/L_K$ estimates for E- and S0-type galaxies in the Local Volume: $38\pm 22$ (NGC 3115), $82\pm 26$ (NGC 5128), $65\pm 20$ (NGC 4594). The high halo-to-stellar mass ratio for E- and S0-type galaxies compared to the average $(20\pm 3)M_{\odot }/L_{\odot }$ ratio for bulgeless spiral galaxies is indicative of a significant difference between the dynamic evolution of early- and late-type galaxies.

arXiv commentAccepted to Asrophysical Bulletin, 16 pages, 5 figures, 4 tables

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• Multiwavelength properties of the low-redshift isolated galaxies with active nuclei modelled with CIGALE