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A sample of metal-poor galaxies identified from the LAMOST spectral survey
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; Zhang, Yong4
2017-05-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume17Issue:5
AbstractWe 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.
SubtypeArticle
KeywordGalaxies: Abundances Galaxies: Evolution Galaxies: Starburst Star Formation
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Development and Reform Commission ; National Development and Reform Commission ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Natural Science Foundation of China (NSFC)(11225315 ; National Natural Science Foundation of China (NSFC)(11225315 ; 1320101002 ; 1320101002 ; 11433005 ; 11433005 ; 11421303) ; 11421303) ; National Development and Reform Commission ; National Development and Reform Commission ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Natural Science Foundation of China (NSFC)(11225315 ; National Natural Science Foundation of China (NSFC)(11225315 ; 1320101002 ; 1320101002 ; 11433005 ; 11433005 ; 11421303) ; 11421303)
DOI10.1088/1674-4527/17/5/41
WOS KeywordDIGITAL 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
Indexed BySCI
Language英语
Funding OrganizationNational Development and Reform Commission ; National Development and Reform Commission ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Natural Science Foundation of China (NSFC)(11225315 ; National Natural Science Foundation of China (NSFC)(11225315 ; 1320101002 ; 1320101002 ; 11433005 ; 11433005 ; 11421303) ; 11421303) ; National Development and Reform Commission ; National Development and Reform Commission ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Basic Research Program of China (973 Program)(2015CB857004) ; National Natural Science Foundation of China (NSFC)(11225315 ; National Natural Science Foundation of China (NSFC)(11225315 ; 1320101002 ; 1320101002 ; 11433005 ; 11433005 ; 11421303) ; 11421303)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000405574100002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8873
Collection光学天文研究部
Affiliation1.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
Recommended Citation
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.,...&Zhang, Yong.(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).
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