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Lessons on Star-forming Ultra-diffuse Galaxies from the Stacked Spectra of the Sloan Digital Sky Survey
Rong,Yu1; Zhu,Kai2,3; Johnston,Evelyn J.1; Zhang,Hong-Xin4,5; Cao,Tianwen1,2,6,7; Puzia,Thomas H.1; Galaz,Gaspar1
2020-08-01
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume899Issue:1
AbstractAbstract 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).
KeywordDwarf galaxies Galaxy evolution Spectroscopy
DOI10.3847/2041-8213/aba8aa
Language英语
WOS IDIOP:2041-8205-899-1-aba8aa
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/62819
Collection中国科学院国家天文台
Affiliation1.Institute of Astrophysics, Pontificia Universidad Católica de Chile, Av. Vicu?a Mackenna 4860, 7820436 Macul, Santiago, Chile; rongyuastrophysics@gmail.com
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, 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.School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026, People’s Republic of China
6.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, 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
Recommended Citation
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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