{
  "id": "1912.04522",
  "version": "v1",
  "published": "2019-12-10T06:10:07.000Z",
  "updated": "2019-12-10T06:10:07.000Z",
  "title": "The Impact of Merging on The Origin of Kinematically Misaligned and Counter-rotating Galaxies in MaNGA",
  "authors": [
    "Song-lin Li",
    "Yong Shi",
    "Dmitry Bizyaev",
    "Christopher Duckworth",
    "Ren-bin Yan",
    "Yan-mei Chen",
    "Long-ji Bing",
    "Jian-hang Chen",
    "Xiao-ling Yu",
    "Rogemar A. Riffel"
  ],
  "comment": "11 pages, 5 figures, submitted to MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Galaxy mergers and interactions are expected to play a significant role leading to offsets between gas and stellar motions in galaxies. Herein we crossmatch galaxies in MaNGA MPL-8 with the Dark Energy Spectroscopic Instrument (DESI) Legacy Surveys and identify 538 galaxies with merging/interacting features to investigate their position angle offsets ($\\Delta$PA) between gas and stellar rotation. We find that there is a much higher merging/interacting fraction in misaligned galaxies (30$^\\circ$ $\\leqslant$ $\\Delta$PA $<$150$^\\circ$) than that in co-rotators ($\\Delta$PA $<$ 30$^\\circ$). This result corroborates that merging/interacting is one of the sources to produce misaligned galaxies and recent merging events can contribute to maximum 40\\% of such misalignment. Furthermore, the marginal merging/interacting fraction in star-forming (SF) counter-rotators ($\\Delta$PA $\\geqslant$ 150$^\\circ$) indicates the minor role of merging in the origin of SF counter-rotators. In addition, the slightly smaller merging/interacting fraction in non star-forming (non-SF) counter-rotators (0.14$\\pm$0.039) than that in non-SF misaligned galaxies (0.22$\\pm$0.031) agrees with that counter-rotating is a stable state, where tidal features disappear. Finally, the ratio of co-rotators to counter-rotators in non-SF merging/interacting galaxies is about 8:1, much larger than the prediction from the isotropic merging (1:1), which supports the speculation that gas and stars prefer to be aligned during merging, as the orbital angular momentum transfers to gas and stellar spin.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-12-10T06:10:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "counter-rotating galaxies",
      "misaligned galaxies",
      "merging/interacting fraction",
      "orbital angular momentum transfers",
      "counter-rotators"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}