AN EXTENDED VIEW OF THE PISCES OVERDENSITY FROM THE SCUSS SURVEY
文献类型：期刊论文
| 作者 | Nie, J. D.1; Smith, M. C.2; Belokurov, V.3; Fan, X. H.4; Fan, Z.1 ; Irwin, M. J.3; Jiang, Z. J.1; Jing, Y. P.5; Koposov, S. E.3; Lesser, M.4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-09-10 |
| 卷号 | 810期号:2 |
| 关键词 | Galaxy: halo Galaxy: structure surveys |
| 英文摘要 | The South Galactic Cap u-band Sky Survey (SCUSS) is a u-band photometric survey covering about 4000 square degrees of the South Galactic Cap, reaching depths of up to 23 mag. By extending around 1.5 mag deeper than the Sloan Digital Sky Survey (SDSS) single-epoch u data, SCUSS is able to probe a much larger volume of the outer halo, i.e., with SCUSS data blue horizontal branch (BHB) stars can trace the outer halo of the Milky Way as far as 100-150 kpc. Utilizing this advantage we combine the SCUSS u-band with the SDSS DR9 gri photometric bands to identify BHB stars and explore halo substructures. We confirm the existence of the Pisces overdensity, which is a structure in the outer halo (at around 80 kpc) that was discovered using RR Lyrae stars. For the first time we are able to determine its spatial extent, finding that it appears to be part of a stream with a clear distance gradient. The stream, which is similar to 5 degrees wide and stretches along similar to 25 degrees, consists of 20-30 BHBs with a total significance of around 6 sigma over the background. Assuming we have detected the entire stream and that the progenitor has fully disrupted, then the number of BHBs suggests that the original system was similar to a smaller classical or a larger ultra-faint dwarf galaxy. On the other hand, if the progenitor still exists, it can be hunted for by reconstructing its orbit from the distance gradient of the stream. This new picture of the Pisces overdensity sheds new light on the origin of this intriguing system. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000362083700069 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5567]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England 4.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA 5.Shanghai Jiao Tong Univ, Dept Phys & Astron, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China |
| 推荐引用方式 GB/T 7714 | Nie, J. D.,Smith, M. C.,Belokurov, V.,et al. AN EXTENDED VIEW OF THE PISCES OVERDENSITY FROM THE SCUSS SURVEY[J]. ASTROPHYSICAL JOURNAL,2015,810(2). |
| APA | Nie, J. D..,Smith, M. C..,Belokurov, V..,Fan, X. H..,Fan, Z..,...&Zou, H..(2015).AN EXTENDED VIEW OF THE PISCES OVERDENSITY FROM THE SCUSS SURVEY.ASTROPHYSICAL JOURNAL,810(2). |
| MLA | Nie, J. D.,et al."AN EXTENDED VIEW OF THE PISCES OVERDENSITY FROM THE SCUSS SURVEY".ASTROPHYSICAL JOURNAL 810.2(2015). |
入库方式： OAI收割
来源：国家天文台
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