GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101
文献类型：期刊论文
| 作者 | Lin, Lin1,2; Zou, Hu3,4 ; Kong, Xu1,2; Lin, Xuanbin1,2; Mao, Yewei1,2,5; Cheng, Fuzhen1,2; Jiang, Zhaoji3,4; Zhou, Xu3,4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-06-01 |
| 卷号 | 769期号:2 |
| 关键词 | galaxies: bulges galaxies: evolution galaxies: individual (M101) galaxies: photometry |
| 英文摘要 | Multiband photometric images from ultraviolet and optical to infrared are collected to derive spatially resolved properties of the nearby Scd-type galaxy M101. With evolutionary stellar population synthesis models, two-dimensional distributions and radial profiles of age, metallicity, dust attenuation, and star formation timescale in the form of the Sandage star formation history are obtained. When fitting with the models, we use the IRX-A(FUV) relation, found to depend on a second parameter of birth rate b (ratio of present-and past-averaged star formation rates), to constrain the dust attenuation. There are obvious parameter gradients in the disk of M101, which supports the theory of an "inside-out" disk growth scenario. Two distinct disk regions with different gradients of age and color are discovered, similar to another late-type galaxy, NGC 628. The metallicity gradient of the stellar content is flatter than that of HII regions. The stellar disk is optically thicker inside than outside and the global dust attenuation of this galaxy is lower compared with galaxies of similar and earlier morphological type. We note that a variational star formation timescale describes the real star formation history of a galaxy. The timescale increases steadily from the center to the outskirt. We also confirm that the bulge in this galaxy is a disk-like pseudobulge, whose evolution is likely to be induced by some secular processes of the small bar which is relatively young, metal-rich, and contains much dust. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000319999100043 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5972]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lin, Lin,Zou, Hu,Kong, Xu,et al. GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101[J]. ASTROPHYSICAL JOURNAL,2013,769(2). |
| APA | Lin, Lin.,Zou, Hu.,Kong, Xu.,Lin, Xuanbin.,Mao, Yewei.,...&Zhou, Xu.(2013).GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101.ASTROPHYSICAL JOURNAL,769(2). |
| MLA | Lin, Lin,et al."GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101".ASTROPHYSICAL JOURNAL 769.2(2013). |
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来源：国家天文台
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