Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522
To investigate the star-forming process in nearby dwarf galaxies, we present integral field unit observations of the star-forming dwarf galaxy NGC 1522 with the Very Large Telescope/Multi Unit Spectroscopic Explorer as a part of the Dwarf Galaxy Integral Survey. Our observations reveal the presence...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/add0b7 |
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| author | Liuze Long Yulong Gao Qiusheng Gu Yong Shi Xin Li Can Xu Yifei Jin Zhiyuan Zheng Jing Dou Fuyan Bian Xiaoling Yu |
| author_facet | Liuze Long Yulong Gao Qiusheng Gu Yong Shi Xin Li Can Xu Yifei Jin Zhiyuan Zheng Jing Dou Fuyan Bian Xiaoling Yu |
| author_sort | Liuze Long |
| collection | DOAJ |
| description | To investigate the star-forming process in nearby dwarf galaxies, we present integral field unit observations of the star-forming dwarf galaxy NGC 1522 with the Very Large Telescope/Multi Unit Spectroscopic Explorer as a part of the Dwarf Galaxy Integral Survey. Our observations reveal the presence of a star-forming clumpy ring in its central region. We identify nine distinct star-forming clumps based on an extinction-corrected H α emission line map, with a total star formation rate of about 0.1 M _⊙ yr ^−1 . The nine clumps are considered to be starbursts, which represent an extreme case in the local Universe, without invoking major merging. We investigate the properties of ionized gas using the strong emission lines and “BPT” diagrams, in conjunction with velocity mapping. Our analysis unveils intriguing patterns, including a positive metallicity gradient and low N/O abundance ratio. This peculiar distribution of metallicity may signify external gas accretion. Our results suggest that the ongoing star formation in NGC 1522 might be triggered and sustained by the inflow of external metal-poor gas. |
| format | Article |
| id | doaj-art-12c65219aea74da69d1fa8d8c6f2a392 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-12c65219aea74da69d1fa8d8c6f2a3922025-08-20T02:34:39ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198613110.3847/1538-4357/add0b7Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522Liuze Long0https://orcid.org/0009-0003-6303-7329Yulong Gao1https://orcid.org/0000-0002-5973-694XQiusheng Gu2https://orcid.org/0000-0002-3890-3729Yong Shi3https://orcid.org/0000-0002-8614-6275Xin Li4https://orcid.org/0000-0001-7634-0034Can Xu5https://orcid.org/0000-0002-8437-6659Yifei Jin6https://orcid.org/0000-0003-0401-3688Zhiyuan Zheng7https://orcid.org/0000-0001-9018-9465Jing Dou8https://orcid.org/0000-0002-6961-6378Fuyan Bian9https://orcid.org/0000-0002-1620-0897Xiaoling Yu10https://orcid.org/0000-0002-2937-6699School of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaHarvard and Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge, MA 02138, USASchool of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210093, People’s Republic of China ; yulong@nju.edu.cn, qsgu@nju.edu.cn; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210093, People’s Republic of ChinaEuropean Southern Observatory , Alonso de Córdova 3107, Casilla 19001, Vitacura, Santiago 19, ChileCollege of Physics and Electronic Engineering, Qujing Normal University , Qujing 655011, Yunnan Province, People’s Republic of ChinaTo investigate the star-forming process in nearby dwarf galaxies, we present integral field unit observations of the star-forming dwarf galaxy NGC 1522 with the Very Large Telescope/Multi Unit Spectroscopic Explorer as a part of the Dwarf Galaxy Integral Survey. Our observations reveal the presence of a star-forming clumpy ring in its central region. We identify nine distinct star-forming clumps based on an extinction-corrected H α emission line map, with a total star formation rate of about 0.1 M _⊙ yr ^−1 . The nine clumps are considered to be starbursts, which represent an extreme case in the local Universe, without invoking major merging. We investigate the properties of ionized gas using the strong emission lines and “BPT” diagrams, in conjunction with velocity mapping. Our analysis unveils intriguing patterns, including a positive metallicity gradient and low N/O abundance ratio. This peculiar distribution of metallicity may signify external gas accretion. Our results suggest that the ongoing star formation in NGC 1522 might be triggered and sustained by the inflow of external metal-poor gas.https://doi.org/10.3847/1538-4357/add0b7Dwarf galaxiesInterstellar mediumStar formation |
| spellingShingle | Liuze Long Yulong Gao Qiusheng Gu Yong Shi Xin Li Can Xu Yifei Jin Zhiyuan Zheng Jing Dou Fuyan Bian Xiaoling Yu Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522 The Astrophysical Journal Dwarf galaxies Interstellar medium Star formation |
| title | Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522 |
| title_full | Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522 |
| title_fullStr | Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522 |
| title_full_unstemmed | Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522 |
| title_short | Clumpy Starburst in a Local Dwarf Galaxy, NGC 1522 |
| title_sort | clumpy starburst in a local dwarf galaxy ngc 1522 |
| topic | Dwarf galaxies Interstellar medium Star formation |
| url | https://doi.org/10.3847/1538-4357/add0b7 |
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