A geostatistical analysis of multiscale metallicity variations in galaxies [II]: Predicting the metallicities of Hii and diffuse ionised gas regions via universal kriging

Abstract

The metallicity of diffuse ionised gas (DIG) cannot be determined using strong emission line diagnostics, which are calibrated to calculate the metallicity of Hii regions. Because of this, resolved metallicity maps from integral field spectroscopy (IFS) data remain largely incomplete. In this paper (the second of a series), we introduce the geostatistical technique of universal kriging, which allows the complete 2D metallicity distribution of a galaxy to be reconstructed from metallicities measured at Hii regions, accounting for spatial correlations between nearby data points. We apply this method to construct high-fidelity metallicity maps of the local spiral galaxy NGC 5236 using data from the TYPHOON/PrISM survey. We find significant correlation in the metallicity of Hii regions separated by up to 0.4-1.2 kpc. Predictions constructed using this method were tested using cross-validation in Hii regions, and we show that they outperform significantly interpolation based on metallicity gradients. Furthermore, we apply kriging to predict the metallicities in regions dominated by DIG emission, considering seven additional spiral galaxies with high resolution (<100pc) metallicity maps. We compare kriging maps to DIG metallicities computed with novel ionisation corrections, and find that such corrections introduce a systematic offset of up to $\pm 0.1$ dex for any individual galaxy, with a scatter of 0.02-0.07 dex for the sample. Overall we recommend universal kriging, together with a calibrated geostatistical model, as the superior method for inferring the metallicities of DIG-dominated regions in local spiral galaxies, demonstrating further the potential of applying geostatistical methods to spatially resolved galaxy observations.

arXiv comment26 pages, 11 figures, including 2 appendices. Accepted for publication in MNRAS

References in corpus (98)

• The Global Schmidt Law in Star Forming Galaxies
• The Host Galaxies of AGN
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• [O III]/[N II] as an Abundance Indicator at High Redshift
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• Using Strong Lines to Estimate Abundances in Extragalactic HII Regions and Starburst Galaxies
• The New Galaxy: Signatures of its Formation
• The Neutral Atomic Phases of the ISM in the Galaxy
• Theoretical Challenges in Galaxy Formation
• De Re Metallica: The cosmic chemical evolution of galaxies
• Cosmicflows-2: The Data
• The Mass-Metallicity Relation with the Direct Method on Stacked Spectra of SDSS Galaxies
• Understanding Galaxy Evolution through Emission Lines
• Cosmicflows-3
• The SAMI Galaxy Survey: instrument specification and target selection
• The Spitzer Local Volume Legacy: Survey Description and Infrared Photometry
• An Objective Definition for the Main Sequence of Star-Forming Galaxies
• The Mass-Metallicity and the Fundamental Metallicity Relation revisited on a fully Te-based abundance scale for galaxies
• Our Peculiar Motion Away from the Local Void
• The warm ionized medium in spiral galaxies
• GASP I: Gas stripping phenomena in galaxies with MUSE
• The Carnegie Supernova Project: Analysis of the First Sample of Low-Redshift Type-Ia Supernovae
• Can retired galaxies mimic active galaxies? Clues from the Sloan Digital Sky Survey
• Interstellar Turbulence II: Implications and Effects
• New calibrations for abundance determinations in HII regions
• MIUSCAT: extended MILES spectral coverage. I. Stellar populations synthesis models
• New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies
• New Strong Line Abundance Diagnostics for \HII Regions: Effects of $\kappa$-Distributed Electron Energies and New Atomic Data
• A z=0 Multi-wavelength Galaxy Synthesis I: A WISE and GALEX Atlas of Local Galaxies
• Chemical abundances in high-redshift galaxies: A powerful new emission line diagnostic
• The Mass-Metallicity relation explored with CALIFA: I. Is there a dependence on the star formation rate?
• The PHANGS-MUSE survey -- Probing the chemo-dynamical evolution of disc galaxies
• A CANDELS - 3D-HST Synergy: Resolved Star Formation Patterns at 0.7 < z < 1.5
• SDSS-IV MaNGA: The Impact of Diffuse Ionized Gas on Emission-line Ratios, Interpretation of Diagnostic Diagrams, and Gas Metallicity Measurements
• Spatially-Resolved Spectroscopic Properties of Low-Redshift Star-Forming Galaxies
• Star formation sustained by gas accretion
• The Spatially Resolved Star Formation Law from Integral Field Spectroscopy: VIRUS-P Observations of NGC 5194
• Mixing Time Scales in a Supernova-Driven Interstellar Medium
• The flat oxygen abundance gradient in the extended disk of M83
• The Survey for Ionization in Neutral-Gas Galaxies: III. Diffuse, Warm Ionized Medium and Escape of Ionizing Radiation
• Integral field spectroscopy of a sample of nearby galaxies: II. Properties of the H ii regions
• A Multiwavelength Optical Emission Line Survey of Warm Ionized Gas in the Galaxy
• The Carnegie-Irvine Galaxy Survey. I. Overview and Atlas of Optical Images
• Signatures of radial migration in barred galaxies: Azimuthal variations in the metallicity distribution of old stars
• Molecular Gas Properties on Cloud Scales Across the Local Star-forming Galaxy Population
• Diffuse ionized gas in galaxies across the Hubble sequence at the CALIFA resolution
• IZI: Inferring the Gas Phase Metallicity (Z) and Ionization Parameter (q) of Ionized Nebulae using Bayesian Statistics
• The GALEX Arecibo SDSS Survey V: The Relation between the HI Content of Galaxies and Metal Enrichment at their Outskirts
• A new scaling relation for HII regions in spiral galaxies: unveiling the true nature of the mass-metallicity relation
• First results from SMAUG: Characterization of Multiphase Galactic Outflows from a Suite of Local Star-Forming Galactic Disk Simulations
• The Carnegie-Chicago Hubble Program. I. An Independent Approach to the Extragalactic Distance Scale Using only Population II Distance Indicators
• Time Inference with MUSE in Extragalactic Rings (TIMER): Properties of the Survey and High-Level Data Products
• Characterising the environments of supernovae with MUSE
• HIIphot: Automated Photometry of HII Regions Applied to M51
• PISCO: The Pmas/ppak Integral-field Supernova hosts COmpilation
• Spiral-induced velocity and metallicity patterns in a cosmological zoom simulation of a Milky Way-sized galaxy
• The MUSE Atlas of Disks (MAD): Resolving Star Formation Rates and Gas Metallicities on < 100pc Scales
• Optical spectroscopy of metal-rich HII regions and circumnuclear hot spots in M83 and NGC 3351
• LZIFU: an emission-line fitting toolkit for integral field spectroscopy data
• Young stars and ionized nebulae in M83: comparing chemical abundances at high metallicity
• The KLEVER Survey: Spatially resolved metallicity maps and gradients in a sample of 1.2 < z < 2.5 lensed galaxies
• New Radial Abundance Gradients for NGC 628 and NGC 2403
• The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365
• Metallicity Fluctuation Statistics in the Interstellar Medium and Young Stars. I. Variance and Correlation
• Starburst-AGN mixing: II. Optically-selected active galaxies
• CLEAR: The Gas-Phase Metallicity Gradients of Star-Forming Galaxies at 0.6 < z < 2.6
• The origin of the ionization of the diffuse interstellar medium in spiral galaxies. II. Modelling the distribution of ionizing radiation in NGC 157
• The Effects of Diffuse Ionized Gas and Spatial Resolution on Metallicity Gradients: TYPHOON Two-Dimensional Spectrophotometry of M83
• Measuring the mixing scale of the ISM within nearby spiral galaxies
• Mixing in Supersonic Turbulence
• Starburst-AGN mixing: I. NGC 7130
• Tracing Outflowing Metals in Simulations of Dwarf and Spiral Galaxies
• Metallicity calibrations for diffuse ionised gas and low ionisation emission regions
• Large Metallicity Variations in the Galactic Interstellar Medium
• SIGNALS: I. Survey Description
• Diffuse ionized gas and its effects on nebular metallicity estimates of star-forming galaxies
• The VIRUS-P Exploration of Nearby Galaxies (VENGA): Spatially Resolved Gas-Phase Metallicity Distributions in Barred and Unbarred Spirals
• Evidence for azimuthal variations of the oxygen abundance gradient tracing the spiral structure of the galaxy HCG91c
• The role of galactic dynamics in shaping the physical properties of giant molecular clouds in Milky Way-like galaxies
• The First Maps of ${\kappa }_d$ -- the Dust Mass Absorption Coefficient -- in Nearby Galaxies, with DustPedia
• The Two-Dimensional Metallicity Distribution and Mixing Scales of Nearby Galaxies
• Metallicity, ionization parameter, and pressure variations of HII regions in the TYPHOON spiral galaxies
• The metallicity dependence of the Cepheid PL-relation
• Three-dimensional extinction mapping using Gaussian random fields
• The diffuse ionized gas (DIG) in star-forming galaxies: the influence of aperture effects on local HII regions
• Photoionized mixing layer models of the diffuse ionized gas
• A geostatistical analysis of multiscale metallicity variations in galaxies [I]: Introduction and comparison of high-resolution metallicity maps to an analytic metal transport model
• Disks as Inhomogeneous, Anisotropic Gaussian Random Fields
• Spatial field reconstruction with INLA: Application to IFU galaxy data
• Spatial Variation in Strong Line Ratios and Physical Conditions in Two Strongly-Lensed Galaxies at z~1.4
• Detection of Extraplanar Diffuse Ionized Gas in M83
• When Gas Dynamics Decouples from Galactic Rotation: Characterizing ISM Circulation in Disk Galaxies

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• Early results from GLASS-JWST. IV: Spatially resolved metallicity in a low-mass $z\sim 3$ galaxy with NIRISS
• Spatial metallicity distribution statistics at $\lesssim 100$ pc scales in the AMUSING++ nearby galaxy sample
• The internal metallicity distributions of simulated galaxies from EAGLE, Illustris, and IllustrisTNG at z=1.8-4 as probed by Gamma Ray Burst hosts
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