Li Jiuli; Zhou Xu; Ma Jun; Chen Jiansheng
Source Publicationchinesejournalofastronomyandastrophysics
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.
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li Jiuli,Zhou Xu,Ma Jun,et al. evolutionofm81withexponentiallydecreasingstarformationrateofpegase[J]. chinesejournalofastronomyandastrophysics,2004,4(2):143.
APA Li Jiuli,Zhou Xu,Ma Jun,&Chen Jiansheng.(2004).evolutionofm81withexponentiallydecreasingstarformationrateofpegase.chinesejournalofastronomyandastrophysics,4(2),143.
MLA Li Jiuli,et al."evolutionofm81withexponentiallydecreasingstarformationrateofpegase".chinesejournalofastronomyandastrophysics 4.2(2004):143.
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