Population gradient in the Sextans dSph: comprehensive mapping of a dwarf galaxy by Suprime-Cam
文献类型：期刊论文
| 作者 | Okamoto, S.3; Arimoto, N.4,5,6; Tolstoy, E.7; Jablonka, P.1,8; Irwin, M. J.2; Komiyama, Y.6; Yamada, Y.6; Onodera, M.4 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017-05-01 |
| 卷号 | 467期号:1页码:208-217 |
| ISSN号 | 0035-8711 |
| 关键词 | Galaxies: Dwarf Galaxies: Individual: Sextans Local Group Galaxies: Stellar Content Galaxies: Structure |
| DOI | 10.1093/mnras/stx086 |
| 英文摘要 | We present the deep and wide V and I-c photometry of the Sextans dwarf spheroidal galaxy (dSph) taken by the Suprime-Cam imager on the Subaru Telescope, which extends out to the tidal radius. The colour-magnitude diagram (CMD) reaches two magnitudes below the main-sequence (MS) turn-off, showing a steep red giant branch, a blue and a red horizontal branch (BHB and RHB, respectively), a sub-giant branch (SGB), an MS and blue stragglers (BSs). We construct the radial profile of each evolutionary phase and demonstrate that blue HB stars are more spatially extended, while red HB stars are more centrally concentrated than the other components. The colour distribution of SGB stars also varies with the galactocentric distance; the inner SGB stars shift bluer than those in the outskirts. The radial differences in the CMD morphology indicate the existence of the age gradient. The relatively younger stars (similar to 10 Gyr) are more centrally concentrated than the older ones (similar to 13 Gyr). The spatial contour maps of stars in different age bins also show that the younger population has a higher concentration and higher ellipticity than the older one. We also detect the centrally concentrated bright BS stars, the number of which is consistent with the idea that a part of these stars belongs to the remnant of a disrupted star cluster discovered in the previous spectroscopic studies. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000398418900013 |
| 源URL | [http://119.78.226.72/handle/331011/32631]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Okamoto, S. |
| 作者单位 | 1.EPFL, Lab Astrophys, Observ Sauverny, CH-1290 Versoix, Switzerland 2.Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England 3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 4.Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA 5.Grad Univ Adv Studies, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan 6.Natl Astron Observ Japan, Osawa 2-21-1, Mitaka, Tokyo 1818588, Japan 7.Univ Groningen, Kapteyn Inst, Postbus 800, NL-9700 AV Groningen, Netherlands 8.Univ Paris Diderot, CNRS, GEPI, Observ Paris, F-92195 Meudon, France |
| 推荐引用方式 GB/T 7714 | Okamoto, S.,Arimoto, N.,Tolstoy, E.,et al. Population gradient in the Sextans dSph: comprehensive mapping of a dwarf galaxy by Suprime-Cam[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,467(1):208-217. |
| APA | Okamoto, S..,Arimoto, N..,Tolstoy, E..,Jablonka, P..,Irwin, M. J..,...&Onodera, M..(2017).Population gradient in the Sextans dSph: comprehensive mapping of a dwarf galaxy by Suprime-Cam.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,467(1),208-217. |
| MLA | Okamoto, S.,et al."Population gradient in the Sextans dSph: comprehensive mapping of a dwarf galaxy by Suprime-Cam".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467.1(2017):208-217. |
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来源：上海天文台
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