University of Hertfordshire

From the same journal

From the same journal

By the same authors

Extragalactic archaeology with the C, N, and O chemical abundances

Research output: Contribution to journalLetter


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Original languageEnglish
Article numberL16
Number of pages4
JournalAstronomy & Astrophysics
Journal publication date9 Feb 2018
Publication statusPublished - 9 Feb 2018


We predict how the C, N, and O abundances within the interstellar medium of galaxies evolve as functions of the galaxy star formation history (SFH). We adopt a hydrodynamical cosmological simulation, focusing on three star-forming disc galaxies with different SFHs. By assuming failed supernovae, we can predict an increasing trend of the gas-phase N/O--O/H abundance diagram, which was not produced in our previous simulations without failed supernovae. At high redshifts, contrary to the predictions of classical chemical evolution models with instantaneous mixing approximation, we find almost flat trends in the N/O--O/H diagram, which are due to the contribution of intermediate-mass stars together with an inhomogeneous chemical enrichment. Finally, we also predict that the average N/O and C/O steadily increase as functions of time, while the average C/N decreases, due to the mass and metallicity dependence of the yields of asymptotic giant branch stars; such variations are more marked during more intense star formation episodes. Our predictions on the CNO abundance evolution can be used to study the SFH of disc galaxies with the James Webb Space Telescope.


Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO 4 pages, 4 figures, accepted for publication in A&A Letters

ID: 13403047