{
  "id": "2104.06743",
  "version": "v1",
  "published": "2021-04-14T09:51:46.000Z",
  "updated": "2021-04-14T09:51:46.000Z",
  "title": "Early-Type (E, S0) Galaxies in the Catalog of Isolated Galaxies (KIG)",
  "authors": [
    "V. E. Karachentseva",
    "I. D. Karachentsev",
    "O. V. Melnyk"
  ],
  "comment": "Accepted to Asrophysical Bulletin, 16 pages, 5 figures, 4 tables",
  "categories": [
    "astro-ph.GA"
  ],
  "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 $M_{\\odot}/L_{K} = (74\\pm26) M_{\\odot}/L_{\\odot}$, 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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-04-14T09:51:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "isolated galaxies",
      "s0-type galaxies",
      "characteristic orbital mass-to-luminosity ratio",
      "high halo-to-stellar mass ratio",
      "line-of-sight velocity differences"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}