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The puzzling properties of the MACS1149-JD1 galaxy at z=9.11

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arxiv 2308.14696 v2 pith:IQEN7LHW submitted 2023-08-28 astro-ph.GA

Massimo Stiavelli , Takahiro Morishita , Marco Chiaberge , Claudio Grillo , Nicha Leethochawalit , Piero Rosati , Stefan Schuldt , Michele Trenti
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Tommaso Treu
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classification astro-ph.GA
keywords datacarbonenrichedformationgalaxynircamstaralready
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abstract

We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1. Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust-free but is already enriched, $12 + \log {\rm (O/H) } = 7.90^{+0.04}_{-0.05}$. We also find that the Carbon and Neon abundances in JD1 are below the solar abundance ratio. Particularly the Carbon under-abundance is suggestive of recent star formation where Type~II supernovae have already enriched the ISM in Oxygen but intermediate mass stars have not yet enriched the ISM in Carbon. A recent burst of star formation is also revealed by the star formation history derived from NIRCam photometry. Our data do not reveal the presence of a significant amount of old populations, resulting in a factor of $\sim7\times$ smaller stellar mass than previous estimates. Thus, our data support the view that JD1 is a young galaxy.

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Cited by 2 Pith papers

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