Chemo-dynamical Evolution of Galaxies

Taylor, Philip R.

doi:10.1007/978-981-15-8818-1_106-1

Handbook of Nuclear Physics 2023

DOI: 10.1007/978-981-15-8818-1_106-1

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Chemo-dynamical Evolution of Galaxies

Philip R. Taylor

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2024

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Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11

Kobayashi,

Ferrara

2024

ApJL

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We interpret the peculiar supersolar nitrogen abundance recently reported by the James Webb Space Telescope observations for GN-z11 (z = 10.6) using our state-of-the-art chemical evolution models. The observed CNO ratios can be successfully reproduced—independently of the adopted initial mass function, nucleosynthesis yields, and presence of supermassive (>1000M ⊙) stars—if the galaxy has undergone an intermittent star formation history with a quiescent phase lasting ∼100 Myr, separating two strong starbursts. Immediately after the second burst, Wolf–Rayet stars (up to 120M ⊙) become the dominant enrichment source, also temporarily (<1 Myr) enhancing particular elements (N, F, Na, and Al) and isotopes (13C and 18O). Alternative explanations involving (i) single burst models, also including very massive stars and/or pair-instability supernovae, or (ii) pre-enrichment scenarios fail to match the data. Feedback-regulated, intermittent star formation might be common in early systems. Elemental abundances can be used to test this hypothesis and to get new insights on nuclear and stellar astrophysics.

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Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11

Kobayashi,

Ferrara

2024

ApJL

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Chemo-dynamical Evolution of Galaxies

Cited by 1 publication

References 179 publications

Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11

Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11

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