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STELLAR POPULATION PROPERTIES AND EVOLUTION ANALYSIS OF NGC 628 WITH PANCHROMATIC PHOTOMETRY
Zou, Hu1,2; Zhang, Wei1; Yang, Yanbin1; Zhou, Xu1; Jiang, Zhaoji1; Ma, Jun1; Wu, Zhenyu1; Wu, Jianghua1; Zhang, Tianmeng1; Fan, Zhou1
2011-07-01
发表期刊ASTRONOMICAL JOURNAL
卷号142期号:1
摘要Panchromatic spectral energy distribution from the ultraviolet, optical to infrared photometry of NGC 628, combined with evolutionary stellar population synthesis, is used to derive the spatially resolved age, metallicity, and reddening maps. These parameter distributions show that the bulge of this galaxy is a disk-like pseudobulge, which has a Sersic index close to the exponential law, rich gas, and a young circumnuclear ring structure. We also discover that the disk has two distinct regions with different radial age and metallicity gradients. The inner region is older and has a much steeper age gradient than the outer region of the disk. Both these two regions and the central young structure can be seen in the radial profile of the optical color. Based on the age and reddening distributions, we conclude that the pseudobulge and disk are likely to have grown via secular evolution, which is the redistribution of mass and energy through the angular momentum transport caused by the non-axisymmetric potential of the spirals. However, possible gas accretion events could affect the outer region of the disk due to abundant Hi gas accumulating in the outer disk.
关键词Galaxies: Evolution Galaxies: Individual (Ngc 628) Galaxies: Photometry Galaxies: Stellar Content
DOI10.1088/0004-6256/142/1/16
收录类别SCI
语种英语
WOS记录号WOS:000291584200016
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7914
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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GB/T 7714
Zou, Hu,Zhang, Wei,Yang, Yanbin,et al. STELLAR POPULATION PROPERTIES AND EVOLUTION ANALYSIS OF NGC 628 WITH PANCHROMATIC PHOTOMETRY[J]. ASTRONOMICAL JOURNAL,2011,142(1).
APA Zou, Hu.,Zhang, Wei.,Yang, Yanbin.,Zhou, Xu.,Jiang, Zhaoji.,...&Fan, Zhou.(2011).STELLAR POPULATION PROPERTIES AND EVOLUTION ANALYSIS OF NGC 628 WITH PANCHROMATIC PHOTOMETRY.ASTRONOMICAL JOURNAL,142(1).
MLA Zou, Hu,et al."STELLAR POPULATION PROPERTIES AND EVOLUTION ANALYSIS OF NGC 628 WITH PANCHROMATIC PHOTOMETRY".ASTRONOMICAL JOURNAL 142.1(2011).
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