{
  "id": "1604.01822",
  "version": "v1",
  "published": "2016-04-06T21:58:41.000Z",
  "updated": "2016-04-06T21:58:41.000Z",
  "title": "Galaxy evolution in nearby galaxy groups. III. A GALEX view of NGC 5846, the largest group in the local universe",
  "authors": [
    "Antonietta Marino",
    "Paola Mazzei",
    "Roberto Rampazzo",
    "Luciana Bianchi"
  ],
  "comment": "26 pages, 13 figures, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We explore the co-evolution of galaxies in nearby groups (V < 3000 km/s) with a multi-wavelength approach. We analyze GALEX far-UV (FUV) and near-UV (NUV) imaging and SDSS u,g,r,i,z data of groups spanning a large range of dynamical phases. We characterize the photometric properties of spectroscopically-confirmed galaxy members and investigate the global properties of the groups through a dynamical analysis. Here we focus on NGC 5846, the third most massive association of Early-Type Galaxies (ETG) after the Virgo and Fornax clusters. The group, composed of 90 members, is dominated by ETGs (about 80 per cent), and among ETGs about 40\\% are dwarfs. Results are compared with those obtained for three groups in the LeoII cloud, which are radically different both in member-galaxy population and dynamical properties. The FUV-NUV cumulative colour distribution and the normalized UV luminosity function (LF) significantly differ due to the different fraction of late-type galaxy population. The UV LF of NGC 5846 resembles that of the Virgo cluster, however our analysis suggests that star-formation episodes are still occurring in most of the group galaxies, including ETGs. The NUV-i colour distribution, the optical-UV colour-colour diagram, and NUV-r vs. Mr colour-magnitude relation suggest that the gas contribution cannot be neglected in the evolution of ETG-type group members. Our analysis highlights that NGC~5846 is still in an active phase of its evolution, notwithstanding the dominance of dwarf and bright ETGs and its virialized configuration.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-04-06T21:58:41.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "nearby galaxy groups",
      "galaxy evolution",
      "galex view",
      "local universe",
      "largest group"
    ],
    "publication": {
      "doi": "10.1093/mnras/stw782"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 26,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1444483
    }
  }
}