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Spectroscopic Observation and Analysis of H ii Regions in M33 with MMT: Temperatures and Oxygen Abundances
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
2017-06-19
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume842Issue:2
AbstractAbstract 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 R25 resulted in slopes of ?0.17?±?0.03, ?0.19?±?0.01, and ?0.16?±?0.17 dex , utilizing abundances from O3N2, N2 diagnostics, and a direct method, respectively.
Keywordgalaxies: abundances galaxies: evolution galaxies: individual (M33) galaxies: ISM galaxies: spiral H ii regions
DOI10.3847/1538-4357/aa6f14
Language英语
WOS IDIOP:0004-637X-842-2-aa6f14
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/35984
Collection中国科学院国家天文台
Affiliation1.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, China; zesenlin@mail.ustc.edu.cn, xkong@ustc.edu.cn
2.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China
3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
4.Institute for Astronomy and History of Science and Technology, Dali University, Dali 671003, China
5.Shanghai Astronomical Observatory, Chinese Academy of Science, 80 Nandan Road, Shanghai, 200030, China
6.CSIRO Astronomy & Space Science, Australia Telescope National Facility, P.O. Box 76, Epping, NSW 1710, Australia
Recommended Citation
GB/T 7714
Lin,Zesen,Hu,Ning,Kong,Xu,et al. Spectroscopic Observation and Analysis of H ii Regions in M33 with MMT: Temperatures and Oxygen Abundances[J]. The Astrophysical Journal,2017,842(2).
APA Lin,Zesen.,Hu,Ning.,Kong,Xu.,Gao,Yulong.,Zou,Hu.,...&Wang,Jing.(2017).Spectroscopic Observation and Analysis of H ii Regions in M33 with MMT: Temperatures and Oxygen Abundances.The Astrophysical Journal,842(2).
MLA Lin,Zesen,et al."Spectroscopic Observation and Analysis of H ii Regions in M33 with MMT: Temperatures and Oxygen Abundances".The Astrophysical Journal 842.2(2017).
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