Volume 610, February 2018
|Number of page(s)||4|
|Section||Letters to the Editor|
|Published online||01 March 2018|
Letter to the Editor
Extragalactic archaeology with the C, N, and O chemical abundances
Centre for Astrophysics Research, University of Hertfordshire,
AL10 9AB, UK
e-mail: email@example.com, firstname.lastname@example.org
Accepted: 7 February 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.
Key words: galaxies: abundances / galaxies: evolution / ISM: abundances / stars: abundances / hydrodynamics
© ESO 2018
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