A sample of metal-poor galaxies identified from the LAMOST spectral survey

Abstract

We present a sample of 48 metal-poor galaxies at $z<0.14$ selected from 92,510 galaxies in the LAMOST survey. These galaxies are identified for their detection of the auroral emission line \oiii$\lambda$4363 above $3\sigma$ level, which allows a direct measurement of the electron temperature and the oxygen abundance. The emission line fluxes are corrected for internal dust extinction using Balmer decrement method. With electron temperature derived from \oiii$λ\lambda4959,5007/\oiii\lambda4363$ and electron density from $\sii\lambda6731/\sii\lambda6717$, we obtain the oxygen abundances in our sample which range from $\zoh= 7.63$ (0.09 $\Zsun$) to $8.46$ (0.6 $\Zsun$). We find an extremely metal-poor galaxy with $\zoh=7.63 \pm 0.01$. With multiband photometric data from FUV to NIR and $\ha$ measurements, we also determine the stellar masses and star formation rates, based on the spectral energy distribution fitting and $\ha$ luminosity, respectively. We find that our galaxies have low and intermediate stellar masses with $\rm 6.39 \le log(M/M_{\sun})\le 9.27$, and high star formation rates (SFRs) with $\rm -2.18 \le log(SFR/M_{\sun} yr^{-1}) \le 1.95$. We also find that the metallicities of our galaxies are consistent with the local $T_e$-based mass-metallicity relation, while the scatter is about 0.28 dex. Additionally, assuming the coefficient of $\alpha =0.66$, we find most of our galaxies follow the local mass-metallicity-SFR relation, while a scatter about 0.24 dex exists, suggesting the mass-metallicity relation is weakly dependent on SFR for those metal-poor galaxies.

arXiv comment17 pages, 6 figures, 1 table, accepted to RAA

References in corpus (49)

• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• The physical properties of star forming galaxies in the low redshift universe
• Theoretical Modeling of Starburst Galaxies
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Stellar Masses and Star Formation Histories for 10^5 Galaxies from the Sloan Digital Sky Survey
• The Second Data Release of the Sloan Digital Sky Survey
• A fundamental relation between mass, SFR and metallicity in local and high redshift galaxies
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• The 'Forbidden' Abundance of Oxygen in the Sun
• AMAZE. I. The evolution of the mass-metallicity relation at z>3
• The First Data Release (DR1) of the LAMOST general survey
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• The chemical composition of metal-poor emission-line galaxies in the Data Release 3 of the Sloan Digital Sky Survey
• The Mass-Metallicity Relation with the Direct Method on Stacked Spectra of SDSS Galaxies
• A fundamental plane for field star-forming galaxies
• The most metal-poor galaxies
• Direct Oxygen Abundances for Low Luminosity LVL Galaxies
• Chemical abundances in high-redshift galaxies: A powerful new emission line diagnostic
• The relation between metallicity, stellar mass and star formation in galaxies: an analysis of observational and model data
• The HIPASS Catalogue: III - Optical Counterparts & Isolated Dark Galaxies
• Eliminating Error in the Chemical Abundance Scale for Extragalactic HII Regions
• The role of cold gas and environment on the stellar mass - metallicity relation of nearby galaxies
• Electron impact excitation of OII fine-structure levels
• Deep Hubble Space Telescope/ACS Observations of I Zw 18: a Young Galaxy in Formation
• The Ultraviolet Sky: An Overview from the GALEX Surveys
• Collision Strengths for [O III] Optical and Infrared Lines
• A Critical Look at the Mass-Metallicity-SFR Relation in the Local Universe. I. An Improved Analysis Framework and Confounding Systematics
• Measuring nebular temperatures: the effect of new collision strengths with equilibrium and kappa-distributed electron energies
• Hunting for extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey: MMT and 3.5m APO observations
• Discovery of Eight New Extremely Metal--Poor Galaxies in the Sloan Digital Sky Survey
• Spectroscopic study of blue compact galaxies V. oxygen abundance and the metallicity-luminosity relation
• The detection of [Ne v] emission in five blue compact dwarf galaxies
• X-ray binary formation in low-metallicity blue compact dwarf galaxies
• The Metal Abundances across Cosmic Time ($\mathcal{M}\mathcal{A}\mathcal{C}\mathcal{T}$) Survey. II. Evolution of the Mass-Metallicity Relation over 8 Billion Years, using [OIII]$\lambda$4363Å-based Metallicities
• "Direct" Gas-phase Metallicities, Stellar Properties, and Local Environments of Emission-line Galaxies at Redshift below 0.90
• Molecular gas as the driver of fundamental galactic relations
• Discovering extremely compact and metal-poor, star-forming dwarf galaxies out to z ~ 0.9 in the VIMOS Ultra-Deep Survey
• HI study of extremely metal-deficient dwarf galaxies. I. The Nancay Radio Telescope observations of twenty-two objects
• The mass-metallicity relation of Lyman-break analogues and its dependence on galaxy properties
• Hide-and-Seek with the Fundamental Metallicity Relation
• Metal-poor, Strongly Star-Forming Galaxies in the DEEP2 Survey: The Relationship between Stellar Mass, Temperature-based Metallicity, and Star Formation Rate
• Metal-poor dwarf galaxies in the SIGRID galaxy sample. I. HII region observations and chemical abundances
• The Metal Abundances across Cosmic Time ($\mathcal{M}\mathcal{A}\mathcal{C}\mathcal{T}$) Survey. I. Optical Spectroscopy in the Subaru Deep Field
• The metallicities of UM151, UM408 and A1228+12 revisited
• The metallicity evolution of blue compact dwarf galaxies from the intermediate redshift to the local Universe

Cited by in corpus (6)

• The Little Cub: Discovery of an Extremely Metal-Poor Star-Forming Galaxy in the Local Universe
• Mass - metallicity relation and fundamental metallicity relation of metal-poor star-forming galaxies at $0.6<z<0.9$ from the eBOSS survey
• Strong [OIII]λ5007 emission line compact galaxies in LAMOST DR9: Blueberries, Green Peas and Purple Grapes
• What determines the local metallicity of galaxies: global stellar mass, local stellar mass surface density or star formation rate?
• Sub-galactic scaling relations with T${}_{\mathrm{e}}$-based metallicity of low metallicity regions in galaxies: metal-poor gas inflow may have important effects?
• Integral Field Spectroscopy of the Cometary Starburst Galaxy NGC 4861