Hα Dots: Direct-Method Metal Abundances of Low-Luminosity Star-Forming Systems

Abstract

Utilizing low-luminosity star-forming systems discovered in the H$\alpha$ Dots survey, we present spectroscopic observations undertaken using the KPNO 4m telescope for twenty-six sources. With determinations of robust, "direct"-method metal abundances, we examine the properties of these dwarf systems, exploring their utility in characterizing starburst galaxies at low luminosities and stellar masses. We find that the H$\alpha$ Dots survey provides an effective new avenue for identifying star-forming galaxies in these regimes. In addition, we examine abundance characteristics and metallicity scaling relations with these sources, highlighting a flattening of both the luminosity-metallicity ($L$-$Z$) and stellar mass-metallicity ($M_{\ast }$-$Z$) relation slopes in these regimes as compared with those utilizing samples covering wider respective dynamic ranges. These local, accessible analogues to the kinds of star-forming dwarfs common at high redshift will help shed light on the building blocks which assembled into the massive galaxies common today.

arXiv commentAccepted for publication in The Astrophysical Journal; 27 pages, 7 figures, 5 tables

References in corpus (85)

• The Sloan Digital Sky Survey: Technical Summary
• The chemical composition of the Sun
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Global Schmidt Law in Star Forming Galaxies
• The Host Galaxies of AGN
• Cosmic Star Formation History
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Dwarf Galaxies of the Local Group
• Cosmic-Ray Rejection by Laplacian Edge Detection
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
• The Second Data Release of the Sloan Digital Sky Survey
• Analysis of galaxy SEDs from far-UV to far-IR with CIGALE: Studying a SINGS test sample
• The Arecibo Legacy Fast ALFA Survey: I. Science Goals, Survey Design and Strategy
• The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
• The chemical composition of metal-poor emission-line galaxies in the Data Release 3 of the Sloan Digital Sky Survey
• Galaxy Zoo Green Peas: Discovery of A Class of Compact Extremely Star-Forming Galaxies
• The Mass-Metallicity Relation with the Direct Method on Stacked Spectra of SDSS Galaxies
• Heavy element abundances in blue compact galaxies
• The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic HI Source Catalog
• On Extending the Mass-Metallicity Relation of Galaxies by 2.5 Decades in Stellar Mass
• Dark matter and cosmic structure
• On The Cosmic Origins Of Carbon And Nitrogen
• The most metal-poor galaxies
• Direct Oxygen Abundances for Low Luminosity LVL Galaxies
• The Luminosity Function of the Milky Way Satellites
• The First Galaxies: Chemical Enrichment, Mixing, and Star Formation
• Green Pea Galaxies and cohorts: Luminous Compact Emission-Line Galaxies in the Sloan Digital Sky Survey
• The Mass-Metallicity and Luminosity-Metallicity Relation from DEEP2 at z ~ 0.8
• Oxygen and Nitrogen in Isolated Dwarf Irregular Galaxies
• The Luminosity-Metallicity relation in the local universe from the 2dF Galaxy Redshift Survey
• Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies
• The Chemical Evolution of Carbon, Nitrogen, and Oxygen in Metal-Poor Dwarf Galaxies
• ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. III. An Extremely Metal Deficient Galaxy
• Leo P: An Unquenched Very Low-Mass Galaxy
• Blueberry galaxies: the lowest mass young starbursts
• Abundances in Spiral Galaxies: Evidence for Primary Nitrogen Production
• The Survey of HI in Extremely Low-mass Dwarfs (SHIELD)
• J0811+4730: the most metal-poor star-forming dwarf galaxy known
• Hunting for extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey: MMT and 3.5m APO observations
• Extremely metal-poor star-forming galaxies. New detections and general morphological and photometric properties
• Metal Abundances of KISS Galaxies III. Nebular Abundances for Fourteen Galaxies and the Luminosity-Metallicity Relationship for HII Galaxies
• Oxygen and Nitrogen in Leo A and GR 8
• The KPNO International Spectroscopic Survey. I. Description of the Survey
• The Metallicities of Low Stellar Mass Galaxies and the Scatter in the Mass-Metallicity Relation
• ALFALFA Discovery of the Most Metal-Poor Gas-Rich Galaxy Known: AGC 198691
• Testing CNO Enrichment Scenarios in Metal-poor Galaxies with HST Spectroscopy
• Metal Abundances of KISS Galaxies. IV. Galaxian Luminosity-Metallicity Relations in the Optical and Near-IR
• Metal Abundances of KISS Galaxies. I. Coarse Metal Abundances and the Metallicity-Luminosity Relation
• An investigation of the luminosity-metallicity relation for a large sample of low-metallicity emission-line galaxies
• Extremely Metal-Poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine Learning Selection of Metal-Poor Galaxies and the Discovery of a Galaxy with M*<10^6 M_sun and 0.016 Z_sun
• ISM Abundances in Sculptor Group Dwarf Irregular Galaxies
• HI and star formation in the most metal-deficient galaxies
• The Star Formation History of the very metal poor BCD IZw18 from HST/ACS data
• ALFA: an automated line fitting algorithm
• A Characteristic Mass Scale in the Mass-Metallicity Relation of Galaxies
• Ionization correction factors and dust depletion patterns in giant HII regions
• The KPNO International Spectroscopic Survey. II. H-alpha Selected Survey List 1
• Searching for metal-deficient emission-line galaxy candidates: the final sample of the SDSS DR12 galaxies
• J1234+3901: an extremely metal-deficient compact star-forming dwarf galaxy at redshift 0.133
• Stellar populations and Star Formation History of the Metal-Poor Dwarf Galaxy DDO 68
• The dust content of the most metal-poor star-forming galaxies
• Leo P: How Many Metals can a Very Low-Mass, Isolated Galaxy Retain?
• Characterization of star-forming dwarf galaxies at 0.1 $\lesssim z\lesssim$ 0.9 in VUDS: Probing the low-mass end of the mass-metallicity relation
• Spectroscopy of Dwarf HII Galaxies in the Virgo Cluster. I. Data, Chemical Abundances and Ionization Structure
• The Leoncino Dwarf Galaxy: Exploring the Low-Metallicity End of the Luminosity-Metallicity and Mass-Metallcity Relations
• J2229+2725: an extremely low-metallicity dwarf compact star-forming galaxy with an exceptionally high [OIII]5007/[OII]3727 flux ratio of 53
• The Little Cub: Discovery of an Extremely Metal-Poor Star-Forming Galaxy in the Local Universe
• Blue diffuse dwarf galaxies: a clearer picture
• MMT Extremely Metal Poor Galaxy Survey I. An Efficient Technique to Identify Metal Poor Galaxies
• Metal Abundances of KISS Galaxies. VI. New Metallicity Relations for the KISS Sample of Star-Forming Galaxies
• Photometric identification and MMT spectroscopy of new extremely metal-poor galaxies: towards a better understanding of young stellar populations at low metallicity
• Properties of the KISS Green Pea Galaxies
• Oxygen Abundance Measurements of SHIELD Galaxies
• Metal Abundances of 12 Dwarf Irregulars from the ADBS Survey
• Empirical ugri-UBVRc Transformations for Galaxies
• Constraining the Stellar Populations and Star Formation Histories of Blue Compact Dwarf Galaxies with SED Fits
• The H$\alpha$ Dots Survey. II. A Second List of Faint Emission-Line Objects
• Metal Abundances of KISS Galaxies. V. Nebular Abundances of Fifteen Intermediate Luminosity Star-Forming Galaxies
• The H$\alpha$ Dots Survey. IV. A Fourth List of Faint Emission-Line Objects

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