What can we learn from the Nitrogen abundance of High-z galaxies?

Détail du document

Identifiant

oai:arXiv.org:2412.06517

Sujet

Astrophysics - Astrophysics of Gal...

Auteur

Stiavelli, Massimo Morishita, Takahiro Chiaberge, Marco Leethochawalit, Nicha Norman, Colin Ricotti, Massimo Roberts-Borsani, Guido Treu, Tommaso Vanzella, Eros Wyse, Rosemary F. G. Zhang, Yechi Boyett, Kit

Catégorie

sciences : astrophysique

Année

2024

Date de référencement

11/12/2024

Mots clés

nitrogen objects

Métrique

Résumé

We present measurements of the gas-phase Oxygen and Nitrogen abundances obtained by applying the direct method to JWST NIRspec $R\sim1000$ spectroscopy for 6 galaxies at redshift greater than 3.

Our measurements are based on rest-frame optical Nitrogen [N II]$_{\lambda\lambda6548,6583}$ lines and are complemented by 6 additional objects from the literature at $3\leq z \leq 6$.

We find that 9 out of 12 objects have values of log(N/O) that are compatible with those found for low-redshift, metal-poor, dwarf galaxies and for HII regions of more luminous local galaxies.

However, 3 out of 12 objects have log(N/O) values that are overabundant compared to what is expected on the basis of their Oxygen abundance.

We explore a few standard scenarios to explain the observations and conclude that, within the limited statistics available to us, none of them can be definitely excluded even though we prefer dilution by pristine gas infall in between star formation bursts as this is predicted by simulations to take place as a natural part of bursty star formation.

;Comment: Submitted to ApJ

Stiavelli, Massimo,Morishita, Takahiro,Chiaberge, Marco,Leethochawalit, Nicha,Norman, Colin,Ricotti, Massimo,Roberts-Borsani, Guido,Treu, Tommaso,Vanzella, Eros,Wyse, Rosemary F. G.,Zhang, Yechi,Boyett, Kit, 2024, What can we learn from the Nitrogen abundance of High-z galaxies?

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