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SDSS-IV MaNGA: Variations in the N/O -- O/H relation bias metallicity gradient measurements

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arxiv 1911.00581 v2 pith:34QX3D5N submitted 2019-11-01 astro-ph.GA

SDSS-IV MaNGA: Variations in the N/O -- O/H relation bias metallicity gradient measurements

Adam L. Schaefer , Christy Tremonti , Francesco Belfiore , Zachary Pace , Matthew A. Bershady , Brett H. Andrews , Niv Drory This is my paper
classification astro-ph.GA
keywords variationsabundancecalibrationsfindgalaxiesmangametallicityradial
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In this paper we use strong line calibrations of N/O and O/H in MaNGA spaxel data to explore the systematics introduced by variations in N/O on various strong-line metallicity diagnostics. We find radial variations in N/O at fixed O/H which correlate with total galaxy stellar-mass; and which can induce $\sim 40 \%$ systematic uncertainties in oxygen abundance gradients when nitrogen-dependent abundance calibrations are used. Empirically, we find that these differences are associated with variation in the local star formation efficiency, as predicted by recent chemical evolution models for galaxies, but we cannot rule out other processes such as radial migration and the accretion of passive dwarf galaxies also playing a role.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Exploring the synergies of $[\mathrm{O\,II}]\lambda 3727$ with MUSE spectroscopy in PHANGS H II regions

    astro-ph.GA 2026-07 accept novelty 5.5

    Adding SITELLE [O II] to PHANGS-MUSE for 556 H II regions recovers known metallicity-calibration offsets, shows <0.03–0.04 dex gradient scatter for many methods, and favors [S III]/[S II] as a robust ionization tracer.

  2. Exploring the synergies of $[\mathrm{O\,II}]\lambda 3727$ with MUSE spectroscopy in PHANGS H II regions

    astro-ph.GA 2026-07 unverdicted novelty 5.0

    Combining [O II] doublet data with MUSE spectra creates a homogeneous H II region catalog and compares strong-line metallicity calibrations, showing low scatter in radial gradients and [S III]/[S II] as a robust ioniz...