The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS
文献类型：期刊论文
| 作者 | Wang, Peng1,2; Guo, Quan3; Libeskind, Noam I.2,4; Tempel, Elmo2,5; Wei, Chengliang1; Kang, Xi1
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2019-04-01 |
| 卷号 | 484期号:3页码:4325-4336 |
| 关键词 | galaxies: dwarf galaxies: general galaxies: haloes Local Group cosmology: observations |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stz285 |
| 通讯作者 | Wang, Peng(wangpeng@pmo.ac.cn) |
| 英文摘要 | It has been shown, both in simulations and observationally, that the tidal field of a large galaxy can torque its satellites such that the major axis of satellite galaxies points towards their hosts. This so-called 'shape alignment' has been observed in isolated Milky Way-like galaxies but not in 'Local Group'-like pairs. In this study, we investigate the shape alignment of satellite galaxies in galaxy pairs similar to the Local Group identified in the Sloan Digital Sky Survey Data Release 13 (SDSS DR13). By stacking tens of thousands of satellite galaxies around primary galaxy pairs, we find two statistically strong alignment signals. (1) The major axes of satellite galaxies located in the (projected) area between two primaries (the facing region) tend to be perpendicular to the line connecting the satellite to its host (tangential alignment), while (2) the major axes of satellite galaxies located in regions away from the other host (the away region) tend to be aligned with the line connecting the satellite to its host (radial alignment). These alignments are confirmed at similar to 5 sigma levels. The alignment signal increases with increasing primary brightness, decreasing pair separation, and decreasing satellite distance. The alignment signal is also found to be stronger in filamentary environments. These findings will shed light on understanding the mechanisms of how satellite galaxies are affected by the tidal field in galaxy pairs and will be useful for investigating galaxy intrinsic alignment in the analyses of weak gravitational lensing. |
| WOS关键词 | DIGITAL SKY SURVEY ; COSMOLOGICAL PARAMETER CONSTRAINTS ; ENHANCED STAR-FORMATION ; DARK-MATTER SUBHALOES ; RADIAL ALIGNMENT ; INTRINSIC ALIGNMENTS ; COSMIC WEB ; MILKY-WAY ; ANISOTROPIC DISTRIBUTION ; DENSITY PROFILES |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000462410300106 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/24242]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Wang, Peng |
| 作者单位 | 1.PMO, 8 Yuan Hua Rd, Nanjing 2100342, Jiangsu, Peoples R China 2.Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany 3.Shanghai Astron Observ SHAO, Nandan Rd 80, Shanghai 200030, Peoples R China 4.UCB Lyon 1, Univ Lyon, CNRS, IN2P3,IPN Lyon, Lyon, France 5.Univ Tartu, Tartu Observ, Observ 1, EE-61602 Toravere, Estonia |
| 推荐引用方式 GB/T 7714 | Wang, Peng,Guo, Quan,Libeskind, Noam I.,et al. The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,484(3):4325-4336. |
| APA | Wang, Peng,Guo, Quan,Libeskind, Noam I.,Tempel, Elmo,Wei, Chengliang,&Kang, Xi.(2019).The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,484(3),4325-4336. |
| MLA | Wang, Peng,et al."The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 484.3(2019):4325-4336. |
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来源：紫金山天文台
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