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Physical Properties of H ii Regions in M51 from Spectroscopic Observations
Wei,Peng1,2,3,4; Zou,Hu3,4; Kong,Xu5; Zhou,Xu3,4; Hu,Ning5,6; Lin,Zesen5,6; Mao,Yewei7; Lin,Lin8; Zhou,Zhimin3; Liu,Xiang1; Ma,Shuguo1,2; Ma,Lu1; Zhong,Tuhong1; Dang,Fei1; Sun,Jiantao1; Lin,Xinkui1
2020-08-10
Source PublicationPublications of the Astronomical Society of the Pacific
ISSN0004-6280
Volume132Issue:1015
AbstractAbstract M51 and NGC 5195 is an interacting system that can be explored in great details with ground-based telescopes. The H ii regions in M51 were observed using the 2.16 m telescope of the National Astronomical Observatories of the Chinese Academy of Sciences and the 6.5 m Multiple Mirror Telescope with spatial resolution of less than ~100 pc. We obtain a total of 113 spectra across the galaxy and combine the literature data of Croxall et al. to derive a series of physical properties, including the gas-phase extinction, stellar population age, star formation rate (SFR) surface density, and oxygen abundance. The spatial distributions and radial profiles of these properties are investigated in order to study the characteristics of M51 and the clues to the formation and evolution of this galaxy. M51 presents a mild radial extinction gradient. The lower gas-phase extinction in the north spiral arms compared to the south arms are possibly caused by the past encounters with the companion galaxy of NGC 5195. A number of H ii regions have the stellar age between 50 and 500 Myr, consistent with the recent interaction history by simulations in the literatures. The SFR surface density presents a mild radial gradient, which is ubiquitous in spiral galaxies. There is a negative metallicity gradient of ?0.08 dex R e ? 1 in the disk region, which is also commonly found in many spiral galaxies. It is supported by the “inside-out” scenario of galaxy formation. We find a positive abundance gradient of 0.26 dex R e ? 1 in the inner region. There are possible reasons causing the positive gradient, including the freezing of the chemical enrichment due to the star-forming quenching in the bulge and the gas infall and dilution due to the pseudobulge growth and/or galactic interaction.
KeywordGalaxy abundances Galaxy evolution H II regions Interstellar dust extinction Interstellar medium Star formation
DOI10.1088/1538-3873/ab9d92
Language英语
WOS IDIOP:0004-6280-132-1015-ab9d92
PublisherThe Astronomical Society of the Pacific
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/61603
Collection中国科学院国家天文台
Affiliation1.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, People's Republic of China; weipeng@xao.ac.cn
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
3.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China zouhu@nao.cas.cn
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
5.Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, People's Republic of China
6.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, People's Republic of China
7.Center for Astrophysics, GuangZhou University, GuangZhou 510006, People's Republic of China
8.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wei,Peng,Zou,Hu,Kong,Xu,et al. Physical Properties of H ii Regions in M51 from Spectroscopic Observations[J]. Publications of the Astronomical Society of the Pacific,2020,132(1015).
APA Wei,Peng.,Zou,Hu.,Kong,Xu.,Zhou,Xu.,Hu,Ning.,...&Lin,Xinkui.(2020).Physical Properties of H ii Regions in M51 from Spectroscopic Observations.Publications of the Astronomical Society of the Pacific,132(1015).
MLA Wei,Peng,et al."Physical Properties of H ii Regions in M51 from Spectroscopic Observations".Publications of the Astronomical Society of the Pacific 132.1015(2020).
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