Strong [O iii] λ5007 Compact Galaxies Identified from SDSS DR16 and Their Scaling Relations

Weiyu Ding; Hu Zou; Xu Kong; Yulong Gao; Fujia Li; Hongxin Zhang; Jiali Wang; Jie Song; Jipeng Sui; Jundan Nie; Suijian Xue; Weijian Guo; Yao Yao; Zhimin Zhou

doi:10.3847/1538-3881/ace893

The Astronomical Journal (Jan 2023)

Strong [O iii] λ5007 Compact Galaxies Identified from SDSS DR16 and Their Scaling Relations

Weiyu Ding,
Hu Zou,
Xu Kong,
Yulong Gao,
Fujia Li,
Hongxin Zhang,
Jiali Wang,
Jie Song,
Jipeng Sui,
Jundan Nie,
Suijian Xue,
Weijian Guo,
Yao Yao,
Zhimin Zhou

Affiliations

Weiyu Ding: ORCiD; Deep Space Exploration Laboratory / Department of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China [email protected]; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People's Republic of China; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]
Hu Zou: ORCiD; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]
Xu Kong: ORCiD; Deep Space Exploration Laboratory / Department of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China [email protected]; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People's Republic of China
Yulong Gao: ORCiD; School of Astronomy and Space Science, Nanjing University , Nanjing 210093, People's Republic of China; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People's Republic of China
Fujia Li: ORCiD; Deep Space Exploration Laboratory / Department of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China [email protected]; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People's Republic of China
Hongxin Zhang: School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People's Republic of China; Department of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China
Jiali Wang: Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]
Jie Song: ORCiD; Deep Space Exploration Laboratory / Department of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China [email protected]; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People's Republic of China
Jipeng Sui: Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]
Jundan Nie: ORCiD; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]
Suijian Xue: Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]
Weijian Guo: Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]
Yao Yao: Deep Space Exploration Laboratory / Department of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China [email protected]; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People's Republic of China
Zhimin Zhou: Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected]

DOI: https://doi.org/10.3847/1538-3881/ace893
Journal volume & issue: Vol. 166, no. 3
p. 133

Abstract

Read online

Green-pea galaxies are a special class of star-forming compact galaxies with strong [O iii ] λ 5007 and considered as analogs of high-redshift Ly α -emitting galaxies and potential sources for cosmic reionization. In this paper, we identify 76 strong [O iii ] λ 5007 compact galaxies at z < 0.35 from DR16 of the Sloan Digital Sky Survey. These galaxies present relatively low stellar mass, high star-formation rate, and low metallicity. Both the star-forming main-sequence (SFMS) relation and mass–metallicity relation (MZR) are investigated and compared with green-pea and blueberry galaxies collected from literature. It is found that our strong [O iii ] λ 5007 compact galaxies share common properties with those compact galaxies with extreme star formation and show distinct scaling relations in respect to those of normal star-forming galaxies at the same redshift. The slope of SFMS is higher, indicates that strong [O iii ] λ 5007 compact galaxies might grow faster in stellar mass. The lower MZR implies that they may be less chemically evolved and hence on the early stage of star formation. A further environmental investigation confirms that they inhabit relatively low-density regions. Future large-scale spectroscopic surveys will provide more details on their physical origin and evolution.

Published in The Astronomical Journal

ISSN: 0004-6256 (Print); 1538-3881 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Astronomy
Website: https://iopscience.iop.org/journal/1538-3881

About the journal

Abstract

Keywords