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  • Hirschauer, Alec S.Space Telescope Science Institute (STScI) (author)

Imaging of I Zw 18 by JWST. I. Detecting Dusty Stellar Populations

  • Article/chapterEnglish2024

Publisher, publication year, extent ...

  • 2024
  • electronicrdacarrier

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  • LIBRIS-ID:oai:research.chalmers.se:823c9806-a8c4-4a57-b627-5fe2ada46fea
  • https://research.chalmers.se/publication/541733URI
  • https://doi.org/10.3847/1538-3881/ad4967DOI

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  • Language:English
  • Summary in:English

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

Notes

  • We present a JWST imaging survey of I Zw 18, the archetypal extremely metal-poor, star-forming (SF), blue compact dwarf galaxy. With an oxygen abundance of only similar to 3% Z circle dot, it is among the lowest-metallicity systems known in the local Universe, and is, therefore, an excellent accessible analog for the galactic building blocks which existed at early epochs of ionization and star formation. These JWST data provide a comprehensive infrared (IR) view of I Zw 18 with eight filters utilizing both Near Infrared Camera (F115W, F200W, F356W, and F444W) and Mid-Infrared Instrument (F770W, F1000W, F1500W, and F1800W) photometry, which we have used to identify key stellar populations that are bright in the near- and mid-IR. These data allow for a better understanding of the origins of dust and dust-production mechanisms in metal-poor environments by characterizing the population of massive, evolved stars in the red supergiant (RSG) and asymptotic giant branch (AGB) phases. In addition, it enables the identification of the brightest dust-enshrouded young stellar objects (YSOs), which provide insight into the formation of massive stars at extremely low metallicities typical of the very early Universe. This paper provides an overview of the observational strategy and data processing, and presents first science results, including identifications of dusty AGB, RSG, and bright YSO candidates. These first results assess the scientific quality of JWST data and provide a guide for obtaining and interpreting future observations of the dusty and evolved stars inhabiting compact dwarf SF galaxies in the local Universe.

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  • Crouzet, NicolasUniversiteit Leiden (UL),Leiden University (UL) (author)
  • Habel, NolanCalifornia Institute of Technology (Caltech) (author)
  • Lenkic, LauraNASA Ames Research Center,California Institute of Technology (Caltech) (author)
  • Nally, ConorUniversity of Edinburgh (author)
  • Jones, Olivia C.UK Astronomy Technology Centre (author)
  • Bortolini, GiacomoStockholms universitet,Stockholm University (author)
  • Boyer, Martha L.Space Telescope Science Institute (STScI) (author)
  • Justtanont, Kay,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)justtano (author)
  • Meixner, MargaretCalifornia Institute of Technology (Caltech) (author)
  • Ostlin, GoranStockholms universitet,Stockholm University (author)
  • Wright, Gillian S.UK Astronomy Technology Centre (author)
  • Azzollini, RuymanUniversity College London (UCL) (author)
  • Blommaert, Joris A. D. L.Vrije Universiteit Brüssel (VUB),Vrije Universiteit Brussel (VUB) (author)
  • Brandl, BernhardUniversiteit Leiden (UL),Leiden University (UL) (author)
  • Decin, LeenKatholieke Universiteit Leuven (author)
  • Nayak, OmnarayaniNASA Goddard Space Flight Center,Space Telescope Science Institute (STScI) (author)
  • Royer, PierreKatholieke Universiteit Leuven (author)
  • Sargent, B. A.Space Telescope Science Institute (STScI),Johns Hopkins University (author)
  • van der Werf, PaulUniversiteit Leiden (UL),Leiden University (UL) (author)
  • Space Telescope Science Institute (STScI)Universiteit Leiden (UL) (creator_code:org_t)

Related titles

  • In:Astronomical Journal168:11538-38810004-6256

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