{
  "id": "2309.11559",
  "version": "v1",
  "published": "2023-09-20T18:00:47.000Z",
  "updated": "2023-09-20T18:00:47.000Z",
  "title": "A Close Look at Ly$α$ Emitters with JWST/NIRCam at $z\\approx3.1$",
  "authors": [
    "Yixiao Liu",
    "Y. Sophia Dai",
    "Stijn Wuyts",
    "Jia-Sheng Huang",
    "Linhua Jiang"
  ],
  "comment": "16 pages, 6 figures, submitted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We study 10 spectroscopically confirmed Ly$\\alpha$ emitters (LAEs) at $z\\approx3.1$ in the UDS field, covered by JWST/NIRCam in the PRIMER program. All LAEs are detected in all NIRCam bands from F090W to F444W, corresponding to restframe 2200\\AA--1.2$\\mathrm{\\mu m}$. Based on morphological analysis of the F200W images, three out of the 10 targets are resolved into pair-like systems with separations of $<0.9''$, and another three show asymmetric structures. We then construct the spectral energy distributions (SEDs) of these LAEs. All sources, including the pairs, show similar SED shapes, with a prominent flux excess in the F200W band, corresponding to extremely strong [O III]+H$\\beta$ emission lines (${\\rm EW_{rest}}=740$--$6500\\,$\\AA). The median effective radii, stellar mass, and UV slope of our sample are 0.36$\\,$kpc, $3.8\\times10^7\\,M_\\odot$, and --2.48, respectively. The average burst age, estimated by stellar mass over star formation rate, is $<40\\,$Myr. These measurements reveal an intriguing starbursting dwarf galaxy population lying off the extrapolations of the $z \\sim 3$ scaling relations to the low-mass end: $\\sim 0.7$ dex above the star-forming main sequence, $\\sim 0.35$ dex below the mass--size relation, and bluer in the UV slope than typical high-z galaxies at similar UV luminosities. We speculate that these numbers may require a larger main sequence scatter or tail in the dwarf galaxy regime towards the starburst outliers.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-09-20T18:00:47.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "close look",
      "starbursting dwarf galaxy population",
      "dwarf galaxy population lying",
      "jwst/nircam",
      "stellar mass"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}