{
  "id": "2007.05021",
  "version": "v1",
  "published": "2020-07-09T18:30:10.000Z",
  "updated": "2020-07-09T18:30:10.000Z",
  "title": "On the accretion of a new group of galaxies onto Virgo: I. Internal kinematics of nine in-falling dEs",
  "authors": [
    "Bahar Bidaran",
    "Anna Pasquali",
    "Thorsten Lisker",
    "Lodovico Coccato",
    "Jesus Falcón-Barroso",
    "Glenn van de Ven",
    "Reynier Peletier",
    "Eric Emsellem",
    "Eva K. Grebel",
    "Francesco La Barbera",
    "Joachim Janz",
    "Agnieszka Sybilska",
    "Rukmani Vijayaraghavan",
    "John Gallagher III",
    "Dimitri A. Gadotti"
  ],
  "comment": "23 pages, 16 figures, Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Galaxy environment has been shown to play an important role in transforming late-type, star-forming galaxies to quiescent spheroids. This transformation is expected to be more severe for low-mass galaxies (M < $10^{10}$ \\(M_\\odot\\)) in dense galaxy groups and clusters, mostly due to the influence of their past host halos (also known as pre-processing) and their present-day environments. For the first time, in this study, we investigate a sample of nine early-type dwarf galaxies (dEs) that were accreted as a likely bound group onto the Virgo galaxy cluster about 2-3 Gyr ago. Considering this special condition, these nine dEs may provide a test bed for distinguishing between the influence of the Virgo galaxy cluster and the effects of the previous host halo on their current properties. Specifically, we use VLT/MUSE integral-field unit spectra to derive their kinematics and specific angular momentum ($\\lambda_{R}$) profiles. We observe a spread in the $\\lambda_{R}$ profiles of our sample dEs, finding that the $\\lambda_{R}$ profiles of half of them are as high as those of low-mass field galaxies. The remaining dEs exhibit $\\lambda_{R}$ profiles as low as those of Virgo dEs that were likely accreted longer ago. Moreover, we detect nebular emission in one dE with a gas velocity offset suggesting ongoing gas stripping in Virgo. We suggest that the low-$\\lambda_{R}$ dEs in our sample were processed by their previous host halo, prior to their infall to Virgo, and that the high-$\\lambda_{R}$ dEs may be experiencing ram pressure stripping in Virgo.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-07-09T18:30:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "internal kinematics",
      "virgo galaxy cluster",
      "offset suggesting ongoing gas",
      "host halo",
      "velocity offset suggesting ongoing"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}