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  • Heintz, K. E.Niels Bohr Institute (author)

The Gas and Stellar Content of a Metal-poor Galaxy at z = 8.496 as Revealed by JWST and ALMA

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023-02-15
  • American Astronomical Society,2023
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:65f0b280-9083-482b-9055-bd4784c78609
  • https://doi.org/10.3847/2041-8213/acb2cfDOI
  • https://research.chalmers.se/publication/534791URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We present a joint analysis of the galaxy S04590 at z = 8.496 based on NIRSpec, NIRCam, and NIRISS observations obtained as part of the Early Release Observations program of the James Webb Space Telescope (JWST) and the far-infrared [C ii] 158 μm emission line detected by dedicated Atacama Large Millimeter/submillimeter Array (ALMA) observations. We determine the physical properties of S04590 from modeling of the spectral energy distribution (SED) and through the redshifted optical nebular emission lines detected with JWST/NIRSpec. The best-fit SED model reveals a low-mass (M ⋆ = 107.2-108 M ⊙) galaxy with a low oxygen abundance of 12 + log ( O / H ) = 7.16 − 0.12 + 0.10 derived from the strong nebular and auroral emission lines. Assuming that [C ii] effectively traces the interstellar medium, we estimate the total gas mass of the galaxy to be M gas = (8.0 ± 4.0) × 108 M ⊙ based on the luminosity and spatial extent of [C ii]. This yields an exceptionally high gas fraction, f gas = M gas/(M gas + M ⋆) ≳ 90%, though one still consistent with the range expected for low metallicity. We further derive the metal mass of the galaxy based on the gas mass and gas-phase metallicity, which we find to be consistent with the expected metal production from Type II supernovae. Finally, we make the first constraints on the dust-to-gas (DTG) and dust-to-metal (DTM) ratios of galaxies in the epoch of reionization at z ≳ 6, showing overall low mass ratios of logDTG < −3.8 and logDTM < −0.5, though they are consistent with established scaling relations and in particular with those of the local metal-poor galaxy I Zwicky 18. Our analysis highlights the synergy between ALMA and JWST in characterizing the gas, metal, and stellar content of the first generation of galaxies.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Giménez-Arteaga, C.Niels Bohr Institute (author)
  • Fujimoto, S.The University of Texas at Austin, USA,Niels Bohr Institute (author)
  • Brammer, G.Niels Bohr Institute (author)
  • Espada, D.Universidad de Granada (author)
  • Gillman, S.Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • González-López, J.Las Campanas Observatory,Universidad Diego Portales,Diego Portales University (author)
  • Greve, T. R.Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • Harikane, YuichiUniversity of Tokyo, Japan (author)
  • Hatsukade, B.University of Tokyo, Japan (author)
  • Knudsen, Kirsten,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kraiberg (author)
  • Koekemoer, Anton M.Space Telescope Science Institute (STScI) (author)
  • Kohno, K.University of Tokyo, Japan (author)
  • Kokorev, V.Rijksuniversiteit Groningen,University of Groningen (author)
  • Lee, M. M.Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • Magdis, Georgios E.Niels Bohr Institute,Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • Nelson, E. J.University of Colorado at Boulder (author)
  • Rizzo, F.Niels Bohr Institute (author)
  • Sanders, R. L.University of California (author)
  • Schaerer, D.Université de Genève,University of Geneva,Institut de Recherche en Astrophysique et Planétologie (IRAP) (author)
  • Shapley, A. E.University of California (author)
  • Strait, V. B.Niels Bohr Institute (author)
  • Toft, SuneNiels Bohr Institute (author)
  • Valentino, F.Niels Bohr Institute,European Southern Observatory (ESO) (author)
  • Wel, A. van derUniversiteit Gent,Ghent university (author)
  • Vijayan, A. P.Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • Watson, D.Niels Bohr Institute (author)
  • Bauer, F. E.Pontificia Universidad Catolica de Chile,Instituto Milenio de Astrofísica,Millennium Institute of Astrophysics (author)
  • Christiansen, C. R.Niels Bohr Institute (author)
  • Wilson, S. N.Niels Bohr Institute (author)
  • The University of Texas at Austin, USANiels Bohr Institute (creator_code:org_t)

Related titles

  • In:Astrophysical Journal Letters: American Astronomical Society944:22041-82132041-8205

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