A Characteristic Mass Scale in the Mass-Metallicity Relation of Galaxies

Abstract

We study the shape of the gas-phase mass-metallicity relation (MZR) of a combined sample of present-day dwarf and high-mass star-forming galaxies using IZI, a Bayesian formalism for measuring chemical abundances presented in Blanc et al. 2015. We observe a characteristic stellar mass scale at $M_{\ast }\simeq 10^{9.5}$M${}_{\odot }$, above which the ISM undergoes a sharp increase in its level of chemical enrichment. In the $10^6-10^{9.5}$M${}_{\odot }$ range the MZR follows a shallow power-law ($Z\propto M_{\ast }^{\alpha }$) with slope $\alpha =0.14\pm 0.08$. At approaching $M_{\ast }\simeq 10^{9.5}$M${}_{\odot }$ the MZR steepens significantly, showing a slope of $\alpha =0.37\pm 0.08$ in the $10^{9.5}-10^{10.5}$M${}_{\odot }$ range, and a flattening towards a constant metallicity at higher stellar masses. This behavior is qualitatively different from results in the literature that show a single power-law MZR towards the low mass end. We thoroughly explore systematic uncertainties in our measurement, and show that the shape of the MZR is not induced by sample selection, aperture effects, a changing N/O abundance, the adopted methodology used to construct the MZR, secondary dependencies on star formation activity, nor diffuse ionized gas (DIG) contamination, but rather on differences in the method used to measure abundances. High resolution hydrodynamical simulations can qualitatively reproduce our result, and suggest a transition in the ability of galaxies to retain their metals for stellar masses above this threshold. The MZR characteristic mass scale also coincides with a transition in the scale height and clumpiness of cold gas disks, and a typical gas fraction below which the efficiency of star formation feedback for driving outflows is expected to decrease sharply.

24 pages, 11 figures, 4 tables, accepted for publication in ApJ

References in corpus (34)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The Host Galaxies and Classification of Active Galactic Nuclei
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• UV Star Formation Rates in the Local Universe
• The Mass-Metallicity Relation at z~2
• Strong Nebular Line Ratios in the Spectra of z~2-3 Star-forming Galaxies: First Results from KBSS-MOSFIRE
• A systematic variation of the stellar initial mass function in early-type galaxies
• The Universal Relation of Galactic Chemical Evolution: The Origin of the Mass-Metallicity Relation
• Extragalactic chemical abundances: do HII regions and young stars tell the same story? The case of the spiral galaxy NGC 300
• The Metallicity of Galaxy Disks: Infall versus Outflow
• The MOSDEF Survey: Mass, Metallicity, and Star-formation Rate at z~2.3
• SDSS-IV MaNGA: The Impact of Diffuse Ionized Gas on Emission-line Ratios, Interpretation of Diagnostic Diagrams, and Gas Metallicity Measurements
• Deriving model-based T${}_e$-consistent chemical abundances in ionised gaseous nebulae
• AGN Emission Line Diagnostics and the Mass-Metallicity Relation up to Redshift z~2: the Impact of Selection Effects and Evolution
• On the abundance discrepancy problem in HII regions
• IZI: Inferring the Gas Phase Metallicity (Z) and Ionization Parameter (q) of Ionized Nebulae using Bayesian Statistics
• A Critical Look at the Mass-Metallicity-SFR Relation in the Local Universe. I. An Improved Analysis Framework and Confounding Systematics
• Stellar Absorption Line Analysis of Local Star-Forming Galaxies: The Relation Between Stellar Mass, Metallicity, Dust Attenuation and Star Formation Rate
• SDSS-V: Pioneering Panoptic Spectroscopy
• Young stars and ionized nebulae in M83: comparing chemical abundances at high metallicity
• Faint emission lines in the Galactic H II regions M16, M20 and NGC 3603
• Carbon and oxygen in HII regions of the Magellanic Clouds: abundance discrepancy and chemical evolution
• The mass-metallicity and fundamental metallicity relations at z>2 using VLT and Subaru near-infrared spectroscopy of zCOSMOS galaxies
• Biases in metallicity measurements from global galaxy spectra: the effects of flux-weighting and diffuse ionized gas contamination
• The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365
• Coevolution of metallicity and star formation in galaxies to z=3.7: I. A fundamental plane
• Separate ways: The Mass-Metallicity Relation does not strongly correlate with Star Formation Rate in SDSS-IV MaNGA galaxies
• A spectroscopic study of blue supergiant stars in the Sculptor galaxy NGC 55: chemical evolution and distance
• Chemical Properties of Star Forming Dwarf Galaxies
• The direct oxygen abundances of metal-rich galaxies derived from electron temperature
• The evolution of galaxy metallicity scaling relations in cosmological hydrodynamical simulations
• The evolution of the star formation rate function and cosmic star formation rate density of galaxies at $z\sim 1-4$
• The Cocoon Nebula and its ionizing star: do stellar and nebular abundances agree?
• Kinematical Structure of the Magellanic System

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