Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe
Based on a new H i survey using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with the Pan-STARRS1 images, we identified an isolated H i cloud without any optical counterpart, named FAST J0139+4328. The newly discovered H i cloud appears to be a typical disk galaxy since...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/acb932 |
| _version_ | 1797695767256760320 |
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| author | Jin-Long Xu Ming Zhu Naiping Yu Chuan-Peng Zhang Xiao-Lan Liu Mei Ai Peng Jiang |
| author_facet | Jin-Long Xu Ming Zhu Naiping Yu Chuan-Peng Zhang Xiao-Lan Liu Mei Ai Peng Jiang |
| author_sort | Jin-Long Xu |
| collection | DOAJ |
| description | Based on a new H i survey using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with the Pan-STARRS1 images, we identified an isolated H i cloud without any optical counterpart, named FAST J0139+4328. The newly discovered H i cloud appears to be a typical disk galaxy since it has a double-peak shape in the global H i profile and an S-like rotation structure in the velocity-position diagram. Moreover, this disk galaxy has an extremely low absolute magnitude ( M _B > −10.0 mag) and stellar mass (<6.9 ×10 ^5 M _⊙ ). Furthermore, we obtained that the H i mass of this galaxy is (8.3 ± 1.7) ×10 ^7 M _⊙ , and the dynamical mass to total baryonic mass ratio is 47 ± 27, implying that dark matter dominates over baryons in FAST J0139+4328. These findings provide observational evidence that FAST J0139+4328 is an isolated dark dwarf galaxy with a redshift of z = 0.0083. This is the first time that an isolated dark galaxy has been detected in the nearby universe. |
| first_indexed | 2024-03-12T03:16:56Z |
| format | Article |
| id | doaj.art-6022fe3eb8bc470288c5c51d32456c5e |
| institution | Directory Open Access Journal |
| issn | 2041-8205 |
| language | English |
| last_indexed | 2024-03-12T03:16:56Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj.art-6022fe3eb8bc470288c5c51d32456c5e2023-09-03T14:08:28ZengIOP PublishingThe Astrophysical Journal Letters2041-82052023-01-019442L4010.3847/2041-8213/acb932Discovery of an Isolated Dark Dwarf Galaxy in the Nearby UniverseJin-Long Xu0https://orcid.org/0000-0002-7384-797XMing Zhu1https://orcid.org/0000-0001-6083-956XNaiping Yu2https://orcid.org/0000-0003-1241-7439Chuan-Peng Zhang3https://orcid.org/0000-0002-4428-3183Xiao-Lan Liu4https://orcid.org/0000-0002-1768-9591Mei Ai5Peng Jiang6National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; xujl@bao.ac.cn; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550000, People’s Republic of China ; mz@nao.cas.cn; CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; xujl@bao.ac.cn; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550000, People’s Republic of China ; mz@nao.cas.cn; CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; xujl@bao.ac.cn; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550000, People’s Republic of China ; mz@nao.cas.cn; CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; xujl@bao.ac.cn; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550000, People’s Republic of China ; mz@nao.cas.cn; CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; xujl@bao.ac.cn; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550000, People’s Republic of China ; mz@nao.cas.cn; CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; xujl@bao.ac.cn; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550000, People’s Republic of China ; mz@nao.cas.cn; CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; xujl@bao.ac.cn; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550000, People’s Republic of China ; mz@nao.cas.cn; CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of ChinaBased on a new H i survey using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with the Pan-STARRS1 images, we identified an isolated H i cloud without any optical counterpart, named FAST J0139+4328. The newly discovered H i cloud appears to be a typical disk galaxy since it has a double-peak shape in the global H i profile and an S-like rotation structure in the velocity-position diagram. Moreover, this disk galaxy has an extremely low absolute magnitude ( M _B > −10.0 mag) and stellar mass (<6.9 ×10 ^5 M _⊙ ). Furthermore, we obtained that the H i mass of this galaxy is (8.3 ± 1.7) ×10 ^7 M _⊙ , and the dynamical mass to total baryonic mass ratio is 47 ± 27, implying that dark matter dominates over baryons in FAST J0139+4328. These findings provide observational evidence that FAST J0139+4328 is an isolated dark dwarf galaxy with a redshift of z = 0.0083. This is the first time that an isolated dark galaxy has been detected in the nearby universe.https://doi.org/10.3847/2041-8213/acb932Extragalactic astronomy |
| spellingShingle | Jin-Long Xu Ming Zhu Naiping Yu Chuan-Peng Zhang Xiao-Lan Liu Mei Ai Peng Jiang Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe The Astrophysical Journal Letters Extragalactic astronomy |
| title | Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe |
| title_full | Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe |
| title_fullStr | Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe |
| title_full_unstemmed | Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe |
| title_short | Discovery of an Isolated Dark Dwarf Galaxy in the Nearby Universe |
| title_sort | discovery of an isolated dark dwarf galaxy in the nearby universe |
| topic | Extragalactic astronomy |
| url | https://doi.org/10.3847/2041-8213/acb932 |
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