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  • Fujimoto, SeijiThe University of Texas at Austin, USA,Köpenhamns universitet,University of Copenhagen (author)

JWST and ALMA Multiple-line Study in and around a Galaxy at z =8.496: Optical to Far-Infrared Line Ratios and the Onset of an Outflow Promoting Ionizing Photon Escape

  • Article/chapterEnglish2024

Publisher, publication year, extent ...

  • 2024
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:e7d705c0-ad47-4d9d-99df-a7ee4a381d77
  • https://research.chalmers.se/publication/540896URI
  • https://doi.org/10.3847/1538-4357/ad235cDOI

Supplementary language notes

  • Language:English
  • Summary in:English

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

Notes

  • We present Atacama Large Millimeter/submillimeter Array (ALMA) deep spectroscopy for a lensed galaxy at z(spec) = 8.496 with log(M-star/M-circle dot) similar to 7.8 whose optical nebular lines and stellar continuum are detected by JWST/NIRSpec and NIRCam Early Release Observations in the field of SMACS J0723.3-7327. Our ALMA spectrum shows [O III] 88 mu m and [C II] 158 mu m line detections at 4.0 sigma and 4.5 sigma, respectively. The redshift and position of the [O III] line coincide with those of the JWST source, while the [C II] line is blueshifted by 90 km s(-1) with a spatial offset of 0.'' 5 (approximate to 0.5 kpc in the source plane) from the centroid of the JWST source. The NIRCam F444W image, including [O III] lambda 5007 and H beta line emission, spatially extends beyond the stellar components by a factor of >8. This indicates that the z = 8.5 galaxy has already experienced strong outflows as traced by extended [O III] lambda 5007 and offset [C II] emission, which would promote ionizing photon escape and facilitate reionization. With careful slit-loss corrections and the removal of emission spatially outside the galaxy, we evaluate the [O III] 88 mu m/lambda 5007 line ratio, and derive the electron density n (e) by photoionization modeling to be 220(-130)(+230) cm(-3), which is comparable with those of z similar to 2-3 galaxies. We estimate an [O III] 88 mu m/[C II] 158 mu m line ratio in the galaxy of >4, as high as those of known z similar to 6-9 galaxies. This high [O III] 88 mu m/[C II] 158 mu m line ratio is generally explained by the high n(e) as well as the low metallicity (Z(gas)/Z(circle dot)=0.04(-0.02)(+0.02)), high ionization parameter (log U > -2.27), and low carbon-to-oxygen abundance ratio (log(C/O) = [-0.52: -0.24]) obtained from the JWST/NIRSpec data; further [C II] follow-up observations will constrain the covering fraction of photodissociation regions.

Subject headings and genre

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  • Ouchi, MasamiNational Astronomical Observatory of Japan,Waseda University (author)
  • Nakajima, KimihikoNational Astronomical Observatory of Japan (author)
  • Harikane, YuichiWaseda University (author)
  • Isobe, YukiWaseda University (author)
  • Brammer, GabrielKöpenhamns universitet,University of Copenhagen (author)
  • Oguri, MasamuneChiba University (author)
  • Gimenez-Arteaga, ClaraKöpenhamns universitet,University of Copenhagen (author)
  • Heintz, Kasper E.Köpenhamns universitet,University of Copenhagen (author)
  • Kokorev, VasilyKöpenhamns universitet,University of Copenhagen (author)
  • Bauer, Franz E.Instituto Milenio de Astrofísica,Millennium Institute of Astrophysics (author)
  • Ferrara, AndreaScuola Normale Superiore di Pisa (author)
  • Kojima, TakashiWaseda University (author)
  • Lagos, Claudia del P.Köpenhamns universitet,University of Copenhagen,ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D),University of Western Australia (author)
  • Laura, SommovigoScuola Normale Superiore di Pisa (author)
  • Schaerer, DanielCentre national de la recherche scientifique (CNRS),Université de Genève,University of Geneva (author)
  • Shimasaku, KazuhiroUniversity of Tokyo, Japan,University of Tokyo, Japan (author)
  • Hatsukade, BunyoUniversity of Tokyo, Japan (author)
  • Kohno, KotaroUniversity of Tokyo, Japan,University of Tokyo, Japan (author)
  • Sun, FengwuUniversity of Arizona (author)
  • Valentino, FrancescoEuropean Southern Observatory Santiago,Köpenhamns universitet,University of Copenhagen (author)
  • Watson, DarachKöpenhamns universitet,University of Copenhagen (author)
  • Fudamoto, YoshinobuWaseda University,National Astronomical Observatory of Japan (author)
  • Inoue, Akio K.Waseda University (author)
  • Gonzalez-Lopez, JorgeUniversidad Diego Portales,Diego Portales University (author)
  • Koekemoer, Anton M.Space Telescope Science Institute (STScI) (author)
  • Knudsen, Kirsten,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kraiberg (author)
  • Lee, Minju M.Köpenhamns universitet,University of Copenhagen,Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • Magdis, Georgios E.Danmarks Tekniske Universitet,Technical University of Denmark,Köpenhamns universitet,University of Copenhagen (author)
  • Richard, JohanUniversité de Lyon (author)
  • Strait, Victoria B.Köpenhamns universitet,University of Copenhagen (author)
  • Sugahara, YumaWaseda University,National Astronomical Observatory of Japan (author)
  • Tamura, YoichiNagoya University (author)
  • Toft, SuneKöpenhamns universitet,University of Copenhagen (author)
  • Umehata, HidekiNagoya University (author)
  • Walth, GregoryCalifornia Institute of Technology (Caltech) (author)
  • The University of Texas at Austin, USAKöpenhamns universitet (creator_code:org_t)

Related titles

  • In:Astrophysical Journal964:21538-43570004-637X

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