{
  "id": "2207.06698",
  "version": "v1",
  "published": "2022-07-14T07:00:49.000Z",
  "updated": "2022-07-14T07:00:49.000Z",
  "title": "Gas dynamics and star formation in NGC 6822",
  "authors": [
    "Hye-Jin Park",
    "Se-Heon Oh",
    "Jing Wang",
    "Yun Zheng",
    "Hong-Xin Zhang",
    "W. J. G. de Blok"
  ],
  "comment": "20 pages, 11 figures, 4 tables, accepted for publication in AJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present H I gas kinematics and star formation activities of NGC 6822, a dwarf galaxy located in the Local Group at a distance of ~ 490 kpc. We perform profile decomposition of line-of-sight velocity profiles of the H I data cube (42.4\" x 12.0\" spatial, corresponding to ~ 100 pc; 1.6 km s$^{-1}$ spectral) taken with the Australia Telescope Compact Array (ATCA). For this, we use a new tool, the so-called BAYGAUD which is based on Bayesian analysis techniques, allowing us to decompose a line-of-sight velocity profile into an optimal number of Gaussian components in a quantitative manner. We classify the decomposed H I gas components of NGC 6822 into cool-bulk, warm-bulk, cool-non-bulk and warm-non-bulk motions with respect to their centroid velocities and velocity dispersions. We correlate their gas surface densities with corresponding star formation rate densities derived using both the GALEX far-ultraviolet and WISE 22 $\\mu$m data to examine the resolved Kennicutt-Schmidt (K-S) law for NGC 6822. Of the decomposed H I gas components, the cool-bulk component is likely to better follow the linear extension of the K-S law for molecular hydrogen (H$_2$) at low gas surface densities where H I is not saturated.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-07-14T07:00:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gas dynamics",
      "corresponding star formation rate densities",
      "low gas surface densities",
      "gas components",
      "line-of-sight velocity profile"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}