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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
Source PublicationASTRONOMICAL JOURNAL
Volume142Issue:1
AbstractPanchromatic 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.
KeywordGalaxies: Evolution Galaxies: Individual (Ngc 628) Galaxies: Photometry Galaxies: Stellar Content
DOI10.1088/0004-6256/142/1/16
Indexed BySCI
Language英语
WOS IDWOS:000291584200016
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7914
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
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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