Lessons on Star-forming Ultra-diffuse Galaxies from the Stacked Spectra of the Sloan Digital Sky Survey
文献类型：期刊论文
| 作者 | Rong,Yu1; Zhu,Kai5,6; Johnston,Evelyn J.1; Zhang,Hong-Xin3,4; Cao,Tianwen1,2,6,7 ; Puzia,Thomas H.1; Galaz,Gaspar1
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| 刊名 | The Astrophysical Journal Letters
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| 出版日期 | 2020-08-01 |
| 卷号 | 899期号:1 |
| 关键词 | Dwarf galaxies Galaxy evolution Spectroscopy |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/aba8aa |
| 英文摘要 | Abstract We investigate the on-average properties for 28 star-forming ultra-diffuse galaxies (UDGs) located in low-density environments, by stacking their spectra from the Sloan Digital Sky Survey. These relatively isolated UDGs, with stellar masses of , have the on-average total stellar metallicity [M/H]?～??0.82?±?0.14, iron metallicity [Fe/H]?～??1.00?±?0.16, stellar age t*?～?5.2?±?0.5 Gyr, α-enhancement [α/Fe]?～?0.24?±?0.10, and oxygen abundance 12+log(O/H)?～?8.16?±?0.06, as well as central stellar velocity dispersion 54?±?12?km s?1. On the star formation rate versus stellar mass diagram, these UDGs are located lower than the extrapolated star-forming main sequence from the massive spirals, but roughly follow the main sequence of low-surface-brightness dwarf galaxies. We find that these star-forming UDGs are not particularly metal-poor or metal-rich for their stellar masses, as compared with the metallicity–mass relations of the nearby typical dwarfs. With the UDG data of this work and previous studies, we also find a coarse correlation between [Fe/H] and magnesium-element enhancement [Mg/Fe] for UDGs: [Mg/Fe]????0.43(±0.26) [Fe/H] ?0.14(±0.40). |
| 语种 | 英语 |
| WOS记录号 | IOP:2041-8205-899-1-ABA8AA |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/62818]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Institute of Astrophysics, Pontificia Universidad Católica de Chile, Av. Vicu?a Mackenna 4860, 7820436 Macul, Santiago, Chile; rongyuastrophysics@gmail.com 2.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 3.School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026, People’s Republic of China 4.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, People’s Republic of China 5.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China 6.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 7.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Rong,Yu,Zhu,Kai,Johnston,Evelyn J.,et al. Lessons on Star-forming Ultra-diffuse Galaxies from the Stacked Spectra of the Sloan Digital Sky Survey[J]. The Astrophysical Journal Letters,2020,899(1). |
| APA | Rong,Yu.,Zhu,Kai.,Johnston,Evelyn J..,Zhang,Hong-Xin.,Cao,Tianwen.,...&Galaz,Gaspar.(2020).Lessons on Star-forming Ultra-diffuse Galaxies from the Stacked Spectra of the Sloan Digital Sky Survey.The Astrophysical Journal Letters,899(1). |
| MLA | Rong,Yu,et al."Lessons on Star-forming Ultra-diffuse Galaxies from the Stacked Spectra of the Sloan Digital Sky Survey".The Astrophysical Journal Letters 899.1(2020). |
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