A tight N/O–potential relation in star-forming galaxies

Author:

Boardman N1ORCID,Wild V1,Asari N Vale2ORCID

Affiliation:

1. School of Physics and Astronomy, University of St Andrews , North Haugh, St Andrews KY16 9SS , UK

2. Departamento de Física–CFM, Universidade Federal de Santa Catarina , C.P. 5064, 88035-972 Florianópolis, SC , Brazil

Abstract

ABSTRACT We report a significantly tighter trend between gaseous N/O and $M_*/R_\mathrm{ e}$ (a proxy for gravitational potential) than has previously been reported between gaseous metallicity and $M_*/R_\mathrm{ e}$, for star-forming galaxies in the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. We argue this result to be a consequence of deeper potential wells conferring greater resistance to metal outflows while also being associated with earlier star-formation histories, combined with N/O being comparatively unaffected by metal-poor inflows. The potential–N/O relation thus appears to be both more resistant to short time-scale baryonic processes and also more reflective of a galaxy’s chemical evolution state, when compared to previously considered relations.

Funder

STFC

CNPq

Publisher

Oxford University Press (OUP)

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