Hα Dots: Direct-method Metal Abundances of Low-luminosity Star-forming Systems

Hirschauer, Alec S.; Salzer, John J.; Haurberg, Nathalie; Gronwall, Caryl Ann; Janowiecki, Steven

doi:10.3847/1538-4357/ac402a

Title: Hα Dots: Direct-method Metal Abundances of Low-luminosity Star-forming Systems

Journal Article · 31 January 2022 · The Astrophysical Journal

DOI: https://doi.org/10.3847/1538-4357/ac402a · OSTI ID:1983211

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Space Telescope Science Institute, Baltimore, MD (United States)
Indiana Univ., Bloomington, IN (United States)
Knox College, Galesburg, IL (United States)
Pennsylvania State Univ., University Park, PA (United States)
Univ. of Texas, Austin, TX (United States)

Utilizing low-luminosity star-forming systems discovered in the Hα Dots survey, we present spectroscopic observations undertaken using the Kitt Peak National Observatory 4 m telescope for 26 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 Hα 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_*–Z) relation slopes in these regimes as compared with those utilizing samples covering wider respective dynamic ranges. These local, accessible analogs to the kinds of star-forming dwarfs common at high redshift will help shed light on the building blocks that assembled into the massive galaxies common today.

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Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)

OSTI ID:: 1983211

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 925; ISSN 0004-637X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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The Hα Dots Survey. II. A Second List of Faint Emission-line Objects Salzer, John J.; Feddersen, Jesse R.; Derloshon, Kathryn The Astronomical Journal, Vol. 160, Issue 5 https://doi.org/10.3847/1538-3881/abba11	journal	November 2020
Constraining the Stellar Populations and Star Formation Histories of Blue Compact Dwarf Galaxies with SED Fits Janowiecki, Steven; Salzer, John J.; Zee, Liese van The Astrophysical Journal, Vol. 836, Issue 1 https://doi.org/10.3847/1538-4357/836/1/128	journal	February 2017
Blueberry Galaxies: The Lowest Mass Young Starbursts Yang, Huan; Malhotra, Sangeeta; Rhoads, James E. The Astrophysical Journal, Vol. 847, Issue 1 https://doi.org/10.3847/1538-4357/aa8809	journal	September 2017
The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic H i Source Catalog Haynes, Martha P.; Giovanelli, Riccardo; Kent, Brian R. The Astrophysical Journal, Vol. 861, Issue 1 https://doi.org/10.3847/1538-4357/aac956	journal	July 2018
Searching for the Lowest-metallicity Galaxies in the Local Universe Hsyu, Tiffany; Cooke, Ryan J.; Prochaska, J. Xavier The Astrophysical Journal, Vol. 863, Issue 2 https://doi.org/10.3847/1538-4357/aad18a	journal	August 2018
The Chemical Evolution of Carbon, Nitrogen, and Oxygen in Metal-poor Dwarf Galaxies Berg, Danielle A.; Erb, Dawn K.; Henry, Richard B. C. The Astrophysical Journal, Vol. 874, Issue 1 https://doi.org/10.3847/1538-4357/ab020a	journal	March 2019
A Characteristic Mass Scale in the Mass–Metallicity Relation of Galaxies Blanc, Guillermo A.; Lu, Yu; Benson, Andrew The Astrophysical Journal, Vol. 877, Issue 1 https://doi.org/10.3847/1538-4357/ab16ec	journal	May 2019
The Leoncino Dwarf Galaxy: Exploring the Low-metallicity End of the Luminosity–Metallicity and Mass–Metallicity Relations McQuinn, Kristen. B. W.; Berg, Danielle A.; Skillman, Evan D. The Astrophysical Journal, Vol. 891, Issue 2 https://doi.org/10.3847/1538-4357/ab7447	journal	March 2020
Properties of the KISS Green Pea Galaxies Brunker, Samantha W.; Salzer, John J.; Janowiecki, Steven The Astrophysical Journal, Vol. 898, Issue 1 https://doi.org/10.3847/1538-4357/ab9ec0	journal	July 2020
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 _⊙ and 0.016 Z _⊙ Kojima, Takashi; Ouchi, Masami; Rauch, Michael The Astrophysical Journal, Vol. 898, Issue 2 https://doi.org/10.3847/1538-4357/aba047	journal	August 2020
HETDEX [O iii] Emitters. I. A Spectroscopically Selected Low-redshift Population of Low-mass, Low-metallicity Galaxies Indahl, Briana; Zeimann, Greg; Hill, Gary J. The Astrophysical Journal, Vol. 916, Issue 1 https://doi.org/10.3847/1538-4357/ac01ed	journal	July 2021
The Hα Dots Survey. IV. A Fourth List of Faint Emission-line Objects Watkins, Joseph D.; Salzer, John J.; Sistine, Angela Van The Astrophysical Journal Supplement Series, Vol. 253, Issue 2 https://doi.org/10.3847/1538-4365/abdf4b	journal	March 2021
The Little Cub: Discovery of an Extremely Metal-poor Star-forming Galaxy in the Local Universe Hsyu, Tiffany; Cooke, Ryan J.; Prochaska, J. Xavier The Astrophysical Journal, Vol. 845, Issue 2 https://doi.org/10.3847/2041-8213/aa821f	journal	August 2017

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