{
  "id": "2409.10963",
  "version": "v1",
  "published": "2024-09-17T08:00:05.000Z",
  "updated": "2024-09-17T08:00:05.000Z",
  "title": "JWST PRIMER: A lack of outshining in four normal z =4-6 galaxies from the ALMA-CRISTAL Survey",
  "authors": [
    "N. E. P. Lines",
    "R. A. A. Bowler",
    "N. J. Adams",
    "R. Fisher",
    "R. G. Varadaraj",
    "Y. Nakazato",
    "M. Aravena",
    "R. J. Assef",
    "J. E. Birkin",
    "D. Ceverino",
    "E. da Cunha",
    "F. Cullen",
    "I. De Looze",
    "C. T. Donnan",
    "J. S. Dunlop",
    "A. Ferrara",
    "N. A. Grogin",
    "R. Herrera-Camus",
    "R. Ikeda",
    "A. M. Koekemoer",
    "M. Killi",
    "J. Li",
    "D. J. McLeod",
    "R. J. McLure",
    "I. Mitsuhashi",
    "P. G. Pérez-González",
    "M. Relano",
    "M. Solimano",
    "J. S. Spilker",
    "V. Villanueva",
    "N. Yoshida"
  ],
  "comment": "16 pages, 8 figures, 3 tables, plus 4 page appendix. Submitted to MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present a spatially resolved analysis of four star-forming galaxies at $z = 4.44-5.64$ using data from the JWST PRIMER and ALMA-CRISTAL surveys to probe the stellar and inter-stellar medium properties on the sub-kpc scale. In the $1-5\\,\\mu{\\rm m}$ JWST NIRCam imaging we find that the galaxies are composed of multiple clumps (between $2$ and $\\sim 8$) separated by $\\simeq 5\\,{\\rm kpc}$, with comparable morphologies and sizes in the rest-frame UV and optical. Using BAGPIPES to perform pixel-by-pixel SED fitting to the JWST data we show that the SFR ($\\simeq 25\\,{\\rm M}_{\\odot}/{\\rm yr}$) and stellar mass (${\\rm log}_{10}(M_{\\star}/{\\rm M}_{\\odot}) \\simeq 9.5$) derived from the resolved analysis are in close ($ \\lesssim 0.3\\,{\\rm dex}$) agreement with those obtained by fitting the integrated photometry. In contrast to studies of lower-mass sources, we thus find a reduced impact of outshining of the older (more massive) stellar populations in these normal $z \\simeq 5$ galaxies. Our JWST analysis recovers bluer rest-frame UV slopes ($\\beta \\simeq -2.1$) and younger ages ($\\simeq 100\\,{\\rm Myr}$) than archival values. We find that the dust continuum from ALMA-CRISTAL seen in two of these galaxies correlates, as expected, with regions of redder rest-frame UV slopes and the SED-derived $A_{\\rm V}$, as well as the peak in the stellar mass map. We compute the resolved IRX-$\\beta$ relation, showing that the IRX is consistent with the local starburst attenuation curve and further demonstrating the presence of an inhomogeneous dust distribution within the galaxies. A comparison of the CRISTAL sources to those from the FirstLight zoom-in simulation of galaxies with the same $M_{\\star}$ and SFR reveals similar age and colour gradients, suggesting that major mergers may be important in the formation of clumpy galaxies at this epoch.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-09-17T08:00:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "jwst primer",
      "alma-cristal survey",
      "redder rest-frame uv slopes",
      "bluer rest-frame uv slopes",
      "local starburst attenuation curve"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}