The Mass-Metallicity Relation at $z\sim 0.8$: Redshift Evolution and Parameter Dependency

Abstract

The spectra of emission-line galaxies (ELGs) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digit Sky Survey (SDSS) are used to study the mass-metallicity relation (MZR) at $z\sim 0.8$. The selected sample contains about 180,000 massive star-forming galaxies with $0.6<z<1.05$ and $9<\log (M_{\star }/M_{\odot })<12$. The spectra are stacked in bins of different parameters including redshift, stellar mass, star formation rate (SFR), specific star formation rate (sSFR), half-light radius, mass density, and optical color. The average MZR at $z\sim 0.83$ has a downward evolution in the MZR from local to high-redshift universe, which is consistent with previous works. At a specified stellar mass, galaxies with higher SFR/sSFR and larger half-light radius have systematically lower metallicity. This behavior is reversed for galaxies with larger mass density and optical color. Among the above physical parameters, the MZR has the most significant dependency on SFR. Our galaxy sample at $0.6<z<1.05$ approximately follows the fundamental metallicity relation (FMR) in the local universe, although the sample inhomogeneity and incompleteness might have effect on our MZR and FMR.

References in corpus (15)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• The Mass-Metallicity Relation at z~2
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• Strong Nebular Line Ratios in the Spectra of z~2-3 Star-forming Galaxies: First Results from KBSS-MOSFIRE
• unWISE: unblurred coadds of the WISE imaging
• Clues to the Origin of the Mass-Metallicity Relation: Dependence on Star Formation Rate and Galaxy Size
• The Universal Relation of Galactic Chemical Evolution: The Origin of the Mass-Metallicity Relation
• The MOSDEF Survey: Mass, Metallicity, and Star-formation Rate at z~2.3
• The 0.1<z<1.65 evolution of the bright end of the [OII] luminosity function
• The host dark matter halos of [OII] emitters at 0.5< z< 1.5
• Investigating Emission Line Galaxy Surveys with the Sloan Digital Sky Survey Telescope
• The mass-metallicity relation of Lyman-break analogues and its dependence on galaxy properties
• The Differential Size Growth of Field and Cluster Galaxies at z=2.1 Using the ZFOURGE Survey