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Evolution of M81 with exponentially decreasing star formation rate of PEGASE
Li, JL; Zhou, X; Ma, J; Chen, JS
2004-04-01
Source PublicationCHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
Volume4Issue:2Pages:143-152
AbstractBased on the large field multicolor observations of Beijing-Arizona-Taiwan-Connecticut (BATC) program, we obtain the spectral energy distribution (SED) for individual regions of M81. We study the structure and evolution of M81 with an evolutionary population synthesis (EPS) model, PEGASE. We find that the exponentially deceasing star formation rate (SFR) with star formation scale 3 Gyr (hereafter Exp, T = 3 Gyr) gives the best agreement between the model predictions and the observed SEDs. We then obtain the structure, age distribution and evolutionary history of M81. There is a clear age gradient between the central and outer regions. The populations in the central regions are older than 7 Gyr, those in the outer regions are younger, at about 4.5 Gyr. The youngest components in the spiral arms have ages of about 2.5 Gyr or less.
KeywordGalaxies : Individual (M81) Galaxies : Evolution Galaxies : Star General
Indexed BySCI
Language英语
WOS IDWOS:000221037700005
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8108
Collection光学天文研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Li, JL,Zhou, X,Ma, J,et al. Evolution of M81 with exponentially decreasing star formation rate of PEGASE[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2004,4(2):143-152.
APA Li, JL,Zhou, X,Ma, J,&Chen, JS.(2004).Evolution of M81 with exponentially decreasing star formation rate of PEGASE.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,4(2),143-152.
MLA Li, JL,et al."Evolution of M81 with exponentially decreasing star formation rate of PEGASE".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 4.2(2004):143-152.
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