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M101: Spectral Observations of H II Regions and Their Physical Properties

文献类型：期刊论文

作者Fan, Zou2; Zou, Hu2; Zhu, Yinan2; Zhou, Zhiming2; Lin, Lin4; Hu, Ning1,7; Wang, Enci1,7; Lin, Zesen1,7; Kong, Xu1,7; Cheng, Fuzhen1,7
刊名ASTROPHYSICAL JOURNAL
出版日期2018-02-10
卷号854期号:1
关键词Galaxies: Evolution Galaxies: Fundamental Parameters Galaxies: Individual (M101) Galaxies: Stellar Content
DOI10.3847/1538-4357/aaa6ca
文献子类Article
英文摘要By using the Hectospec 6.5 m Multiple Mirror Telescope and the 2.16 m telescope of the National Astronomical Observatories, of the Chinese Academy of Sciences, we obtained 188 high signal-to-noise ratio spectra of H II regions in the nearby galaxy M101, which is the largest spectroscopic sample of H II regions for this galaxy so far. These spectra cover a wide range of regions on M101, which enables us to analyze two-dimensional distributions of its physical properties. The physical parameters are derived from emission lines or stellar continua, including stellar population age, electron temperature, oxygen abundance, etc. The oxygen abundances are derived using two empirical methods based on O3N2 and R-23 indicators, as well as the direct T-e method when [O III] lambda 4363 is available. By applying the harmonic decomposition analysis to the velocity field, we obtained a line-of-sight rotation velocity of 71 km s(-1) and a position angle of 36 degrees. The stellar age profile shows an old stellar population in the galaxy center and a relatively young stellar population in outer regions, suggesting an old bulge and a young disk. The oxygen abundance profile exhibits a clear break at similar to 18 kpc, with a gradient of -0.0364 dex kpc(-1) in the inner region and -0.00686 dex kpc(-1) in the outer region. Our results agree with the "inside-out" disk growth scenario of M101.
WOS关键词MASS-METALLICITY RELATION ; STAR-FORMING GALAXIES ; SPIRAL GALAXIES ; ABUNDANCE GRADIENTS ; MILKY-WAY ; SAURON PROJECT ; HII-REGIONS ; GAS-FLOWS ; COSMOLOGICAL SIMULATIONS ; TRANSITION-PROBABILITIES
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000425000100008
资助机构National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program, "The Emergence of Cosmological Structures")(XDB09000000) ; Chinese Academy of Sciences (the Strategic Priority Research Program, "The Emergence of Cosmological Structures")(XDB09000000) ; Ministry of Finance ; Ministry of Finance ; 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)(11320101002 ; National Natural Science Foundation of China (NSFC)(11320101002 ; University of Science and Technology of China(WK2030220019) ; University of Science and Technology of China(WK2030220019) ; 11421303 ; 11421303 ; 11433005) ; 11433005) ; National Astronomical Observatories of China ; National Astronomical Observatories of China ; Chinese Academy of Sciences (the Strategic Priority Research Program, "The Emergence of Cosmological Structures")(XDB09000000) ; Chinese Academy of Sciences (the Strategic Priority Research Program, "The Emergence of Cosmological Structures")(XDB09000000) ; Ministry of Finance ; Ministry of Finance ; 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)(11320101002 ; National Natural Science Foundation of China (NSFC)(11320101002 ; University of Science and Technology of China(WK2030220019) ; University of Science and Technology of China(WK2030220019) ; 11421303 ; 11421303 ; 11433005) ; 11433005)
源URL[http://ir.bao.ac.cn/handle/114a11/20303]  
专题国家天文台_光学天文研究部
作者单位1.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, 20A Datun Rd, Beijing 100012, Peoples R China
3.Dali Univ, Inst Astron & Hist Sci & Technol, Dali 671003, Peoples R China
4.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
6.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
7.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Fan, Zou,Zou, Hu,Zhu, Yinan,et al. M101: Spectral Observations of H II Regions and Their Physical Properties[J]. ASTROPHYSICAL JOURNAL,2018,854(1).
APA Fan, Zou.,Zou, Hu.,Zhu, Yinan.,Zhou, Zhiming.,Lin, Lin.,...&Zhou,Xu.(2018).M101: Spectral Observations of H II Regions and Their Physical Properties.ASTROPHYSICAL JOURNAL,854(1).
MLA Fan, Zou,et al."M101: Spectral Observations of H II Regions and Their Physical Properties".ASTROPHYSICAL JOURNAL 854.1(2018).

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来源：国家天文台

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