{
  "id": "2303.17246",
  "version": "v1",
  "published": "2023-03-30T09:24:14.000Z",
  "updated": "2023-03-30T09:24:14.000Z",
  "title": "Sub-Millimetre Galaxies with Webb: Near-Infrared Counterparts and Multi-wavelength Morphology",
  "authors": [
    "S. Gillman",
    "B. Gullberg",
    "G. Brammer",
    "A. Vijayan",
    "M. Lee",
    "D. Blánquez",
    "M. Brinch",
    "T. Greve",
    "I. Jermann",
    "S. Jin",
    "V. Kokorev",
    "L. Liu",
    "G. Magdis",
    "F. Rizzo",
    "F. Valentino"
  ],
  "comment": "Submitted for publication in A&A. Comments welcome. 18 pages",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We utilise the unprecedented depth and resolution of recent early-release science (ERS) JWST observations to define the near-infrared counterparts of sub-millimetre selected galaxies (SMGs). We identify 45 SCUBA-2 SMG positions within The Cosmic Evolution Early Release Science Survey (CEERS) JWST/NIRCam fields. Through an analysis of multi-wavelength $p$-values, NIRCam colours and predicted SCUBA-2 fluxes, we define 43 JWST/NIRCam counterparts to the SCUBA-2 SMGs, finding a 63 per cent agreement with those identified in prior $HST$ studies. Using EaZy-py we fit the available HST and JWST observations to quantify the photometric redshifts of the NIRCam-SMGs, establishing a broad range of redshift from $z$$\\approx$0.2$-$5.4 with a median of $z$$\\approx$2.29, in agreement with other studies of SMGs. We analyse their rest-frame optical and near-infrared morphological properties (e.g. effective radius (R$_{\\rm e}$), S\\'ersic index ($n$), CAS, Gini and M$_{20}$), finding, on average, late-type disc-like morphologies with large scatter into the intermediate and merger regions of the non-parametric parameter space. For the non-merging galaxies, we find a median rest-frame optical size and S\\'ersic index (and $1\\sigma$ scatter) of R$_{\\rm e}$=3.10$\\pm$1.67kpc and $n$=0.96$\\pm$0.66. Whilst in the rest-frame near-infrared we establish more compact, higher S\\'ersic index morphologies (R$_{\\rm e}$=1.64$\\pm$0.97, $n$=1.85$\\pm$0.63). We further establish that both the rest-frame optical and near-infrared effective radii correlate negatively (at a 2$\\sigma$ level) with redshift whilst the S\\'ersic index remains constant with cosmic time. Our results are consistent with the picture of inside-out galaxy evolution, with more centrally concentrated older stellar populations, and more extended, younger star-forming regions whose stellar emission is heavily attenuated in the central regions.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-03-30T09:24:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "near-infrared counterparts",
      "multi-wavelength morphology",
      "sub-millimetre galaxies",
      "jwst observations",
      "sersic index remains constant"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}