{
  "id": "2205.08279",
  "version": "v1",
  "published": "2022-05-16T09:11:21.000Z",
  "updated": "2022-05-16T09:11:21.000Z",
  "title": "Revisiting The Mass-Size Relation Of Structures In Molecular Clouds",
  "authors": [
    "Yuchen Xing",
    "Keping Qiu"
  ],
  "comment": "14 pages, 9 figures. Accepted by Research in Astron. Astrophys",
  "doi": "10.1088/1674-4527/ac6fb7",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "We revisit the mass-size relation of molecular cloud structures based on the column density map of the Cygnus-X molecular cloud complex. We extract 135 column density peaks in Cygnus-X and analyze the column density distributions around these peaks. The averaged column density profiles, $N(R)$, around all the peaks can be well fitted with broken power-laws, which are described by an inner power-law index $n$, outer power-law index $m$, and the radius $R_{\\rm TP}$ and column density $N_{\\rm TP}$ at the transition point. We then explore the $M-R$ relation with different samples of cloud structures by varying the $N(R)$ parameters and the column density threshold, $N_0$, which determines the boundary of a cloud structure. We find that only when $N_0$ has a wide range of values, the $M - R$ relation may largely probe the density distribution, and the fitted power-law index of the $M-R$ relation is related to the power-law index of $N(R)$. On the contrary, with a constant $N_0$, the $M - R$ relation has no direct connection with the density distribution; in this case, the fitted power-law index of the $M - R$ relation is equal to 2 (when $N_0\\ge N_{\\rm TP}$ and $n$ has a narrow range of values), larger than 2 (when $N_0\\ge N_{\\rm TP}$ and $n$ has a wide range of values), or slightly less than 2 (when $N_0< N_{\\rm TP}$).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-05-16T09:11:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "mass-size relation",
      "density distribution",
      "cloud structure",
      "fitted power-law index",
      "wide range"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "IOP"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}