Imaging of I Zw 18 by JWST: I. Strategy and First Results of Dusty Stellar Populations
arxiv(2024)
摘要
We present a James Webb Space Telescope (JWST) imaging survey of I Zw 18, the
archetypal extremely metal-poor, star-forming, blue compact dwarf galaxy. With
an oxygen abundance of only ∼3
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
NIRCam (F115W, F200W, F356W, and F444W) and MIRI (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 star,
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
star-forming galaxies in the local universe.
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