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M101: Spectral Observations of H II Regions and Their Physical Properties
Hu, Ning1,2; Wang, Enci1,2; Lin, Zesen1,2; Kong, Xu1,2; Cheng, Fuzhen1,2; Fan, Zou3; Fang, Guangwen4; Lin, Lin5; Mao, Yewei6; Wang, Jing7; Zhou, Xu3; Zhou, Zhiming3; Zhu, Yinan3; Zou, Hu3
2018-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume854Issue:1Pages:11
Abstract

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.

Keywordgalaxies: evolution galaxies: fundamental parameters galaxies: individual (M101) galaxies: stellar content
DOI10.3847/1538-4357/aaa6ca
WOS KeywordMASS-METALLICITY RELATION ; STAR-FORMING GALAXIES ; SPIRAL GALAXIES ; ABUNDANCE GRADIENTS ; MILKY-WAY ; SAURON PROJECT ; HII-REGIONS ; GAS-FLOWS ; COSMOLOGICAL SIMULATIONS ; TRANSITION-PROBABILITIES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000425000100008
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22320
Collection中国科学院紫金山天文台
Corresponding AuthorHu, Ning
Affiliation1.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, 20A Datun Rd, 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.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
7.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
Recommended Citation
GB/T 7714
Hu, Ning,Wang, Enci,Lin, Zesen,et al. M101: Spectral Observations of H II Regions and Their Physical Properties[J]. ASTROPHYSICAL JOURNAL,2018,854(1):11.
APA Hu, Ning.,Wang, Enci.,Lin, Zesen.,Kong, Xu.,Cheng, Fuzhen.,...&Zou, Hu.(2018).M101: Spectral Observations of H II Regions and Their Physical Properties.ASTROPHYSICAL JOURNAL,854(1),11.
MLA Hu, Ning,et al."M101: Spectral Observations of H II Regions and Their Physical Properties".ASTROPHYSICAL JOURNAL 854.1(2018):11.
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