THE STRUCTURE AND STELLAR CONTENT OF THE OUTER DISKS OF GALAXIES: A NEW VIEW FROM THE Pan-STARRS1 MEDIUM DEEP SURVEY
文献类型：期刊论文
| 作者 | Zheng, Zheng1,2 ; Thilker, David A.1; Heckman, Timothy M.1; Meurer, Gerhardt R.3; Burgett, W. S.4; Chambers, K. C.5; Huber, M. E.4; Kaiser, N.4; Magnier, E. A.4; Metcalfe, N.5
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-02-20 |
| 卷号 | 800期号:2 |
| 关键词 | galaxies: evolution galaxies: formation galaxies: photometry |
| 英文摘要 | We present the results of an analysis of Pan-STARRS1Medium Deep Survey multi-band (grizy) images of a sample of 698 low-redshift disk galaxies that span broad ranges in stellar mass, star-formation rate, and bulge/disk ratio. We use population synthesis spectral energy distribution fitting techniques to explore the radial distribution of the light, color, surface mass density, mass/light ratio, and age of the stellar populations. We characterize the structure and stellar content of the galaxy disks out to radii of about twice Petrosian r(90), beyond which the halo light becomes significant. We measure normalized radial profiles for sub-samples of galaxies in three bins each of stellar mass and concentration. We also fit radial profiles to each galaxy. The majority of galaxies have down-bending radial surface brightness profiles in the bluer bands with a break radius at roughly r(90). However, they typically show single unbroken exponentials in the reddest bands and in the stellar surface mass density. We find that the mass/light ratio and stellar age radial profiles have a characteristic "U" shape. There is a good correlation between the amplitude of the down-bend in the surface brightness profile and the rate of the increase in the M/L ratio in the outer disk. As we move from late-to early-type galaxies, the amplitude of the down-bend and the radial gradient in M/L both decrease. Our results imply a combination of stellar radial migration and suppression of recent star formation can account for the stellar populations of the outer disk. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000349782500043 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6643]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Western Australia, Int Ctr Radio Astron Res, Crawley, WA 6009, Australia 4.Univ Hawaii Manoa, Inst Astron, Honolulu, HI 96822 USA 5.Univ Durham, Dept Phys, Durham DH1 3LE, England 6.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA |
| 推荐引用方式 GB/T 7714 | Zheng, Zheng,Thilker, David A.,Heckman, Timothy M.,et al. THE STRUCTURE AND STELLAR CONTENT OF THE OUTER DISKS OF GALAXIES: A NEW VIEW FROM THE Pan-STARRS1 MEDIUM DEEP SURVEY[J]. ASTROPHYSICAL JOURNAL,2015,800(2). |
| APA | Zheng, Zheng.,Thilker, David A..,Heckman, Timothy M..,Meurer, Gerhardt R..,Burgett, W. S..,...&Waters, C..(2015).THE STRUCTURE AND STELLAR CONTENT OF THE OUTER DISKS OF GALAXIES: A NEW VIEW FROM THE Pan-STARRS1 MEDIUM DEEP SURVEY.ASTROPHYSICAL JOURNAL,800(2). |
| MLA | Zheng, Zheng,et al."THE STRUCTURE AND STELLAR CONTENT OF THE OUTER DISKS OF GALAXIES: A NEW VIEW FROM THE Pan-STARRS1 MEDIUM DEEP SURVEY".ASTROPHYSICAL JOURNAL 800.2(2015). |
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来源：国家天文台
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