A sample of metal-poor galaxies identified from the LAMOST spectral survey
文献类型：期刊论文
| 作者 | Gao, Yu-Long1,2; Lian, Jian-Hui1,2; Kong, Xu1,2; Lin, Ze-Sen1,2; Hu, Ning1,2; Liu, Hai-Yang1,2; Wang, En-Ci1,2; Cao, Zi-Huang3 ; Hou, Yong-Hui4; Wang, Yue-Fei4
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2017-05-01 |
| 卷号 | 17期号:5 |
| 关键词 | galaxies: abundances galaxies: evolution galaxies: starburst star formation |
| 英文摘要 | We present a sample of 48 metal-poor galaxies at z < 0. 1 4 selected from 92 510 galaxies in the LAMOST survey. These galaxies are identified by their detection of the auroral emission line [O III] lambda 4363 above the 3 sigma level, which allows a direct measurement of electron temperature and oxygen abundance. The emission line fluxes are corrected for internal dust extinction using the Balmer decrement method. With electron temperature derived from [O III] lambda lambda 4959, 5007/[OIII]lambda 4363 and electron density from [S II] lambda 6731/[S II]lambda 6717, we obtain the oxygen abundances in our sample which range from 1 2 vertical bar log (O /H) = 7.63 (0.09 Z(circle dot)) to 8.46 (0.6 Z(circle dot)). We find an extremely metal-poor galaxy with 12 + log (O /H) = 7. 6 3 +/- 0. 0 1. With multiband photometric data from FUV to NIR and H alpha measurements, we also determine the stellar masses and star formation rates, based on the spectral energy distribution fitting and H alpha luminosity, respectively. We find that our galaxies have low and intermediate stellar masses with 6.39 <= log (M/M-circle dot) <= 9.27, and high star formation rates (SFRs) with -2.18 <= log (SFR/M-circle dot yr(-1)) <= 1.95. We also find that the metallicities of our galaxies are consistent with the local T-e -based mass-metallicity relation, while the scatter is about 0.28 dex. Additionally, assuming the coefficient of alpha = 0.66, we find most of our galaxies follow the local mass-metallicitySFR relation, but a scatter of about 0.24 dex exists, suggesting the mass-metallicity relation is weakly dependent on SFR for those metal-poor galaxies. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; STAR-FORMING GALAXIES ; MASS-METALLICITY RELATION ; EMISSION-LINE GALAXIES ; COMPACT DWARF GALAXIES ; HIGH-REDSHIFT GALAXIES ; H-II REGIONS ; COLLISION STRENGTHS ; DATA RELEASE ; TRANSITION-PROBABILITIES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000405574100002 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8873]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Sci & Technol China, CAS Key Lab Res Galaxies & Cosmol, Dept Astron, Hefei 230026, Peoples R China 2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, Yu-Long,Lian, Jian-Hui,Kong, Xu,et al. A sample of metal-poor galaxies identified from the LAMOST spectral survey[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(5). |
| APA | Gao, Yu-Long.,Lian, Jian-Hui.,Kong, Xu.,Lin, Ze-Sen.,Hu, Ning.,...&Cao Zihuang.(2017).A sample of metal-poor galaxies identified from the LAMOST spectral survey.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(5). |
| MLA | Gao, Yu-Long,et al."A sample of metal-poor galaxies identified from the LAMOST spectral survey".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.5(2017). |
入库方式： OAI收割
来源：国家天文台
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