{
  "id": "1611.10085",
  "version": "v1",
  "published": "2016-11-30T10:41:22.000Z",
  "updated": "2016-11-30T10:41:22.000Z",
  "title": "The sub-galactic and nuclear main sequences for local star-forming galaxies",
  "authors": [
    "A. Maragkoudakis",
    "A. Zezas",
    "M. L. N. Ashby",
    "S. P. Willner"
  ],
  "comment": "13 pages, 13 figures, submitted to MNRAS, revised version after referee's comments",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We describe a sub-galactic main sequence (SGMS) relating star formation rate surface density ($\\Sigma_{\\textrm{SFR}}$) and stellar mass density ($\\Sigma_{\\star}$) for distinct regions within star forming galaxies, including their nuclei. We use a sample of 246 nearby star-forming galaxies from the \"Star Formation Reference Survey\" and demonstrate that the SGMS holds down to $ \\sim $1 kpc scales with a slope of $\\alpha=0.91$ and a dispersion of 0.31 dex, similar to the well-known main sequence (MS) measured for globally integrated star formation rates (SFRs) and stellar masses. The SGMS slope depends on galaxy morphology, with late-type galaxies (Sc$-$Irr) having $\\alpha = 0.97$ and early-type spirals (Sa$-$Sbc) having $\\alpha = 0.81$. The SGMS constructed from sub-regions of individual galaxies has on average the same characteristics as the composite SGMS from all galaxies. The SGMS for galaxy nuclei shows a dispersion similar to that seen for other sub-regions. Sampling a limited range of SFR$-$M$_{\\star} $ space may produce either sub-linearity or super-linearity of the SGMS slope. For nearly all galaxies, both SFR and stellar mass peak in the nucleus, indicating that circumnuclear clusters are among the most actively star-forming regions in the galaxy and the most massive. The nuclear SFR also correlates with total galaxy mass, forming a distinct sequence from the standard MS of star-formation. The nuclear main sequence will be useful for studying bulge growth and for characterizing feedback processes connecting AGN and star formation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-11-30T10:41:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "nuclear main sequence",
      "local star-forming galaxies",
      "star formation rate surface",
      "formation rate surface density",
      "integrated star formation rates"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}