The KLEVER survey: Nitrogen abundances at $z\sim$2 and probing the existence of a fundamental nitrogen relation

Abstract

We present a comparison of the nitrogen-to-oxygen ratio (N/O) in 37 high-redshift galaxies at $z\sim$2 taken from the KMOS Lensed Emission Lines and VElocity Review (KLEVER) Survey with a comparison sample of local galaxies, taken from the Sloan Digital Sky Survey (SDSS). The KLEVER sample shows only a mild enrichment in N/O of $+$0.1 dex when compared to local galaxies at a given gas-phase metallicity (O/H), but shows a depletion in N/O of $-$0.36 dex when compared at a fixed stellar mass (M${}_{\ast }$). We find a strong anti-correlation in local galaxies between N/O and SFR in the M${}_{\ast }$-N/O plane, similar to the anti-correlation between O/H and SFR found in the mass-metallicity relation (MZR). We use this anti-correlation to construct a fundamental nitrogen relation (FNR), analogous to the fundamental metallicity relation (FMR). We find that KLEVER galaxies are consistent with both the FMR and the FNR. This suggests that the depletion of N/O in high-$z$ galaxies when considered at a fixed M${}_{\ast }$ is driven by the redshift-evolution of the mass-metallicity relation in combination with a near redshift-invariant N/O-O/H relation. Furthermore, the existence of an fundamental nitrogen relation suggests that the mechanisms governing the fundamental metallicity relation must be probed by not only O/H, but also N/O, suggesting pure-pristine gas inflows are not the primary driver of the FMR, and other properties such as variations in galaxy age and star formation efficiency must be important.

23 pages, 11 figures, Accepted for publication in Monthly Notices of the Royal Astronomical Society

References in corpus (30)

• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• UV Star Formation Rates in the Local Universe
• The Mass-Metallicity Relation at z~2
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• Strong Nebular Line Ratios in the Spectra of z~2-3 Star-forming Galaxies: First Results from KBSS-MOSFIRE
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• The Mass-Metallicity and the Fundamental Metallicity Relation revisited on a fully Te-based abundance scale for galaxies
• New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies
• The MOSDEF Survey: The Evolution of the Mass-Metallicity Relation from $z=0$ to $z\sim 3.3$
• Nebular Emission Line Ratios in z~2-3 Star-Forming Galaxies with KBSS-MOSFIRE: Exploring the Impact of Ionization, Excitation, and Nitrogen-to-Oxygen Ratio
• The MOSDEF Survey: Mass, Metallicity, and Star-formation Rate at z~2.3
• The MOSDEF Survey: Excitation Properties of $z\sim 2.3$ Star-forming Galaxies
• A method to remove residual OH emission from near infrared spectra
• A strong case for fast stellar rotation at very low metallicities
• Simulations of Cosmic Chemical Enrichment
• Metallicities and Physical Conditions in Star-forming Galaxies at z~1.0-1.5
• Keck HIRES Spectroscopy of Extragalactic HII Regions: C and O Abundances from Recombination Lines
• CHAOS I: Direct Chemical Abundances for HII Regions in NGC 628
• A Possible Origin of the Mass-Metallicity Relation of Galaxies
• The KMOS^3D Survey: data release and final survey paper
• Are galactic star formation and quenching governed by local, global or environmental phenomena?
• P-MaNGA: Emission Lines Properties - Gas Ionisation and Chemical Abundances from Prototype Observations
• A new imprint of fast rotators: low 12C/13C ratios in extremely metal-poor halo stars
• The KLEVER Survey: Spatially resolved metallicity maps and gradients in a sample of 1.2 < z < 2.5 lensed galaxies
• The NIRVANDELS Survey: a robust detection of $\alpha$-enhancement in star-forming galaxies at $z\simeq 3.4$
• The MOSDEF-LRIS Survey: The Connection Between Massive Stars and Ionized Gas in Individual Galaxies at $z\sim 2$
• The diffuse ionized gas (DIG) in star-forming galaxies: the influence of aperture effects on local HII regions
• The ASTRODEEP Frontier Fields Catalogues III. Multiwavelength photometry and rest frame properties of MACS-J0717 and MACS-J1149

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