The role of gas kinematics in setting metallicity gradients at high redshift

Abstract

In this work, we explore the diversity of ionised gas kinematics (rotational velocity $v_{\varphi }$ and velocity dispersion ${\sigma }_{\mathrm{g}}$) and gas-phase metallicity gradients at $0.1\le z\le 2.5$ using a compiled data set of 74 galaxies resolved with ground-based integral field spectroscopy. We find that galaxies with the highest and the lowest ${\sigma }_{\mathrm{g}}$ have preferentially flat metallicity gradients, whereas those with intermediate values of ${\sigma }_{\mathrm{g}}$ show a large scatter in the metallicity gradients. Additionally, steep negative gradients appear almost only in rotation-dominated galaxies ($v_{\varphi }/{\sigma }_{\mathrm{g}}>1$), whereas most dispersion-dominated galaxies show flat gradients. We use our recently developed analytic model of metallicity gradients to provide a physical explanation for the shape and scatter of these observed trends. In the case of high ${\sigma }_{\mathrm{g}}$, the inward radial advection of gas dominates over metal production and causes efficient metal mixing, thus giving rise to flat gradients. For low ${\sigma }_{\mathrm{g}}$, it is the cosmic accretion of metal-poor gas diluting the metallicity that gives rise to flat gradients. Finally, the reason for intermediate ${\sigma }_{\mathrm{g}}$ showing the steepest negative gradients is that both inward radial advection and cosmic accretion are weak as compared to metal production, which leads to the creation of steeper gradients. The larger scatter at intermediate ${\sigma }_{\mathrm{g}}$ may be due in part to preferential ejection of metals in galactic winds, which can decrease the strength of the production term. Our analysis shows how gas kinematics play a critical role in setting metallicity gradients in high-redshift galaxies.

arXiv comment15 pages, 10 figures. Accepted by MNRAS

References in corpus (122)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The chemical composition of the Sun
• Galactic Stellar and Substellar Initial Mass Function
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Star Formation in the Milky Way and Nearby Galaxies
• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• The Host Galaxies and Classification of Active Galactic Nuclei
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products and Mosaics
• Simulating Galaxy Formation with the IllustrisTNG Model
• Stellar mass-to-light ratios and the Tully-Fisher relation
• [O III]/[N II] as an Abundance Indicator at High Redshift
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• Constraints on the relationship between stellar mass and halo mass at low and high redshift
• A Cosmology Calculator for the World Wide Web
• FIRE-2 Simulations: Physics versus Numerics in Galaxy Formation
• The SINS survey: SINFONI Integral Field Spectroscopy of z ~ 2 Star-forming Galaxies
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Star-formation Mass Sequence out to z=2.5
• The MUSE second-generation VLT instrument
• The Baryonic Tully-Fisher Relation
• The Dust Opacity of Star-Forming Galaxies
• De Re Metallica: The cosmic chemical evolution of galaxies
• Gusty, gaseous flows of FIRE: galactic winds in cosmological simulations with explicit stellar feedback
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• Structural Parameters of Galaxies in CANDELS
• Understanding Galaxy Evolution through Emission Lines
• The Evolution of the Star-forming Interstellar Medium across Cosmic Time
• Theoretical Evolution of Optical Strong Lines across Cosmic Time
• SINFONI - Integral Field Spectroscopy at 50 milli-arcsecond resolution with the ESO VLT
• A large Hα survey at z=2.23, 1.47, 0.84 & 0.40: the 11 Gyr evolution of star-forming galaxies from HiZELS
• The Metallicity-Luminosity Relation, Effective Yields, and Metal Loss in Spiral and Irregular Galaxies
• Maximally Star-Forming Galactic Disks I. Starburst Regulation Via Feedback-Driven Turbulence
• A Unified Model for Galactic Discs: Star Formation, Turbulence Driving, and Mass Transport
• SDSS IV MaNGA - Metallicity and nitrogen abundance gradients in local galaxies
• The impact of the nitrogen-to-oxygen ratio on ionized nebulae diagnostics based on [NII] emission lines
• The Baryonic Assembly of Dark Matter Halos
• Strongly baryon-dominated disk galaxies at the peak of galaxy formation ten billion years ago
• The Cosmic BPT Diagram: Confronting Theory with Observations
• Where stars form: inside-out growth and coherent star formation from HST Halpha maps of 2676 galaxies across the main sequence at z~1
• The Epoch of Disk Settling: z~1 to Now
• Star-Forming Galaxies at Cosmic Noon
• The SINS/zC-SINF survey of z~2 galaxy kinematics: SINFONI adaptive optics-assisted data and kiloparsec-scale emission line properties
• Spatially-Resolved Spectroscopic Properties of Low-Redshift Star-Forming Galaxies
• The KMOS Redshift One Spectroscopic Survey (KROSS): Dynamical properties, gas and dark matter fractions of typical z~1 star-forming galaxies
• Gas-Phase Oxygen Gradients in Strongly Interacting Galaxies: I. Early-Stage Interactions
• Feedback-regulated star formation in molecular clouds and galactic discs
• The Evolution and Origin of Ionized Gas Velocity Dispersion from $z\sim 2.6$ to $z\sim 0.6$ with KMOS${}^{3D}$
• MASSIV: Mass Assembly Survey with SINFONI in VVDS - II. Kinematics and close environment classification
• Constraining Sub-Grid Physics with High-Redshift Spatially-Resolved Metallicity Distributions
• The Origin and Evolution of Metallicity Gradients: Probing the Mode of Mass Assembly at z=2
• The angular momentum distribution and baryon content of star forming galaxies at z~1-3
• High-Redshift Star-Forming Galaxies: Angular Momentum and Baryon Fraction, Turbulent Pressure Effects and the Origin of Turbulence
• The KMOS^3D Survey: data release and final survey paper
• HiZELS: a high redshift survey of H-alpha emitters. II: the nature of star-forming galaxies at z=0.84
• Balance among gravitational instability, star formation, and accretion determines the structure and evolution of disk galaxies
• MASSIV: Mass Assembly Survey with SINFONI in VVDS. III. Evidence for positive metallicity gradients in z~1.2 star-forming galaxies
• The evolution of metallicity and metallicity gradients from z=2.7-0.6 with KMOS3D
• z~2: An Epoch of Disk Assembly
• Metallicity Gradient of a Lensed Face-on Spiral Galaxy at Redshift 1.49
• How well can we Measure the Intrinsic Velocity Dispersion of Distant Disk Galaxies?
• Measuring the Physical Conditions in High-Redshift Star-Forming Galaxies: Insights from KBSS-MOSFIRE
• An Integral Field Study of Abundance Gradients in Nearby LIRGs
• The MUSE-Wide Survey: Survey Description and First Data Release
• Vertical Equilibrium, Energetics, and Star Formation Rates in Magnetized Galactic Disks Regulated by Momentum Feedback from Supernovae
• Rotation Curves in z~1-2 Star-Forming Disks: Evidence for Cored Dark Matter Distributions
• Falling outer rotation curves of star-forming galaxies at 0.6 < z < 2.6 probed with KMOS^3D and SINS/ZC-SINF
• The evolution of the Tully-Fisher relation between z~2.3 and z~0.9 with KMOS^3D
• The MUSE-Wide Survey: A first catalogue of 831 emission line galaxies
• LZIFU: an emission-line fitting toolkit for integral field spectroscopy data
• A mass-dependent slope of the galaxy size-mass relation out to z~3: further evidence for a direct relation between median galaxy size and median halo mass
• The KLEVER Survey: Spatially resolved metallicity maps and gradients in a sample of 1.2 < z < 2.5 lensed galaxies
• A relationship between specific star formation rate and metallicity gradient within z=1 galaxies from KMOS-HiZELS
• Gas-phase metallicity gradients of TNG50 star-forming galaxies
• Thermal-Instability-Driven Turbulent Mixing in Galactic Disks: I. Effective Mixing of Metals
• A Keck Survey of Gravitationally-Lensed Star-Forming Galaxies: High Spatial Resolution Studies of Kinematics and Metallicity Gradients
• Why do high-redshift galaxies show diverse gas-phase metallicity gradients?
• On the Evolution of the Velocity-Mass-Size Relations of Disk-Dominated Galaxies over the Past 10 Billion Years
• Metallicity Fluctuation Statistics in the Interstellar Medium and Young Stars. I. Variance and Correlation
• Stars were born in significantly denser regions in the early Universe
• MASSIV: Mass Assemby Survey with SINFONI in VVDS. I. Survey description and global properties of the 0.9 < z < 1.8 galaxy sample
• The momentum budget of clustered supernova feedback in a 3D, magnetised medium
• The effects of spatial resolution on Integral Field Spectrograph surveys at different redshifts. The CALIFA perspective
• Mass Transport and Turbulence in Gravitationally Unstable Disk Galaxies II: The Effects of Star Formation Feedback
• The physics of gas phase metallicity gradients in galaxies
• Systematics in Metallicity Gradient Measurements I : Angular Resolution, Signal-to-Noise and Annuli Binning
• Nebular Excitation in z~2 Star-forming Galaxies from the SINS and LUCI Surveys: The Influence of Shocks and AGN
• CLEAR: The Gas-Phase Metallicity Gradients of Star-Forming Galaxies at 0.6 < z < 2.6
• First gas-phase metallicity gradients of $0.1\lesssim z\lesssim 0.8$ galaxies with MUSE
• The Grism Lens-Amplified Survey from Space (GLASS). II. Gas-phase metallicity and radial gradients in an interacting system at z~2
• Measuring the mixing scale of the ISM within nearby spiral galaxies
• Distinguishing Mergers and Disks in High Redshift Observations of Galaxy Kinematics
• Mixing and transport of metals by gravitational instability-driven turbulence in galactic discs
• The Shapes of the Rotation Curves of Star-forming Galaxies Over the Last $\approx$10 Gyr
• From global to spatially resolved in low-redshift galaxies
• The KMOS Redshift One Spectroscopic Survey (KROSS): The Tully-Fisher Relation at z ~ 1
• The KMOS${}^{3D}$ Survey: Investigating the Origin of the Elevated Electron Densities in Star-Forming Galaxies at $1\lesssim z\lesssim 3$
• The MAGPI Survey -- science goals, design, observing strategy, early results and theoretical framework
• On the origin of the mass-metallicity gradient relation in the local Universe
• The KMOS${}^{3D}$ Survey: rotating compact star forming galaxies and the decomposition of integrated line widths
• KROSS-SAMI: A Direct IFS Comparison of the Tully-Fisher Relation Across 8 Gyr Since $z\approx 1$
• The dynamics of z=0.8 H-alpha-selected star-forming galaxies from KMOS/CF-HiZELS
• Mixing of metals during star cluster formation: statistics and implications for chemical tagging
• Inferring gas-phase metallicity gradients of galaxies at the seeing limit: A forward modelling approach
• The evolution of the metallicity gradient and the star formation efficiency in disc galaxies
• ZFIRE: The Evolution of the Stellar Mass Tully-Fisher Relation to Redshift 2.0 < Z < 2.5 with MOSFIRE
• Star-forming regions and the metallicity gradients in the tidal tails: The case of NGC 92
• Kinematic Evolution of Simulated Star-Forming Galaxies
• The Evolution of Gas-Phase Metallicity and Resolved Abundances in Star-forming Galaxies at $z\approx 0.6-1.8$
• Flat Rotation Curves of $z\sim 1$ Star-Forming Galaxies and Evidence of Disk-Scale Length Evolution
• Detection of metallicity correlations in 100 nearby galaxies
• Declining rotation curves at $z=2$ in $\Lambda$CDM galaxy formation simulations
• A re-assessment of strong line metallicity conversions in the machine learning era
• The redshift evolution of the baryonic Tully-Fisher relation in Simba
• Quasi-equilibrium models of high-redshift disc galaxy evolution
• SPICA and the Chemical Evolution of Galaxies: The Rise of Metals and Dust
• Phase A Science Case for MAVIS -- The Multi-conjugate Adaptive-optics Visible Imager-Spectrograph for the VLT Adaptive Optics Facility
• Simulating gas kinematic studies of high-redshift galaxies with the HARMONI Integral Field Spectrograph
• ERIS: revitalising an adaptive optics instrument for the VLT

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• The resolved chemical abundance properties within the interstellar medium of star-forming galaxies at $\text{z}\approx 1.5$
• Insights on Metal Enrichment and Environmental Effect at $z\approx 5-7$ with JWST ASPIRE/EIGER and Chemical Evolution Model
• MASCOT: Molecular gas depletion times and metallicity gradients -- evidence for feedback in quenching active galaxies
• A path towards constraining the evolution of the interstellar medium and outflows in the Milky Way using APOGEE
• The ALPINE-CRISTAL-JWST Survey: Gas-phase abundance gradients of main sequence star-forming galaxies and their kinematics at $4<z<6$
• When did the initial mass function become bottom-heavy?
• KURVS: chemical properties from multiple strong line calibrations for star-forming galaxies at $z\sim 1.5$