中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Spectroscopic Observation and Analysis of HII Regions in M33 with MMT: Temperatures and Oxygen Abundances

文献类型:期刊论文

作者Lin, Zesen1,2; Hu, Ning1,2; Kong, Xu1,2; Gao, Yulong1,2; Zou, Hu3; Wang, Enci1,2; Cheng, Fuzhen1,2; Fang, Guanwen4; Lin, Lin5; Wang, Jing6
刊名ASTROPHYSICAL JOURNAL
出版日期2017-06-20
卷号842期号:2
关键词galaxies: abundances galaxies: evolution galaxies: individual (M33) galaxies: ISM galaxies: spiral H II regions
英文摘要The spectra of 413 star-forming (or H II) regions in M33 (NGC 598) were observed using the multifiber spectrograph of Hectospec at the 6.5 m Multiple Mirror Telescope. Using this homogeneous spectra sample, we measured the intensities of emission lines and some physical parameters, such as electron temperatures, electron densities, and metallicities. Oxygen abundances were derived via the direct method (when available) and two empirical strong-line methods, namely, O3N2 and N2. At the high-metallicity end, oxygen abundances derived from the O3N2 calibration were higher than those derived from the N2 index, indicating an inconsistency between O3N2 and N2 calibrations. We present a detailed analysis of the spatial distribution of gas-phase oxygen abundances in M33 and confirm the existence of the axisymmetric global metallicity distribution that is widely assumed in the literature. Local variations were also observed and subsequently associated with spiral structures to provide evidence of radial migration driven by arms. Our O/H gradient fitted out to 1.1 R-25 resulted in slopes of -0.17 +/- 0.03, -0.19 +/- 0.01, and -0.16 +/- 0.17 dex R-25(-1), utilizing abundances from O3N2, N2 diagnostics, and a direct method, respectively.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]H-II REGIONS ; EXCITATION COLLISION STRENGTHS ; NEARBY SPIRAL GALAXIES ; STAR-FORMING GALAXIES ; STELLAR POPULATION ; TRANSITION-PROBABILITIES ; AZIMUTHAL VARIATIONS ; COMPOSITION GRADIENT ; CHEMICAL ABUNDANCES ; STARBURST GALAXIES
收录类别SCI
语种英语
WOS记录号WOS:000403655500004
源URL[http://ir.bao.ac.cn/handle/114a11/8813]  
专题国家天文台_光学天文研究部
作者单位1.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, 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, Beijing 100012, Peoples R China
4.Dali Univ, Inst Astron & Hist Sci & Technol, Dali 671003, Peoples R China
5.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
6.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
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GB/T 7714
Lin, Zesen,Hu, Ning,Kong, Xu,et al. Spectroscopic Observation and Analysis of HII Regions in M33 with MMT: Temperatures and Oxygen Abundances[J]. ASTROPHYSICAL JOURNAL,2017,842(2).
APA Lin, Zesen.,Hu, Ning.,Kong, Xu.,Gao, Yulong.,Zou, Hu.,...&Wang, Jing.(2017).Spectroscopic Observation and Analysis of HII Regions in M33 with MMT: Temperatures and Oxygen Abundances.ASTROPHYSICAL JOURNAL,842(2).
MLA Lin, Zesen,et al."Spectroscopic Observation and Analysis of HII Regions in M33 with MMT: Temperatures and Oxygen Abundances".ASTROPHYSICAL JOURNAL 842.2(2017).

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来源:国家天文台

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