BRIGHTEST SATELLITE GALAXY ALIGNMENT OF SLOAN DIGITAL SKY SURVEY GALAXY GROUPS
文献类型：期刊论文
| 作者 | Li, Zhigang1,2; Wang, Yougang1 ; Yang, Xiaohu3,4; Chen, Xuelei1,5; Xie, Lizhi2,6; Wang, Xin7
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-05-01 |
| 卷号 | 768期号:1 |
| 关键词 | galaxies: formation galaxies: groups: general galaxies: kinematics and dynamics galaxies: statistics |
| 英文摘要 | We study the alignment signal between the distribution of the brightest satellite galaxies (BSGs) and the major axes of their host groups using the Sloan Digital Sky Survey group catalog constructed by Yang et al. After correcting for the effect of group ellipticity, a statistically significant (similar to 5 sigma) major-axis alignment is detected and the alignment angle is found to be 43 degrees.0 +/- 0 degrees.4. More massive and richer groups show a stronger BSG alignment. The BSG alignment around blue brightest central galaxies (BCGs) is slightly stronger than that around red BCGs. Red BSGs have a much stronger major-axis alignment than blue BSGs. Unlike BSGs, other satellites do not show very significant alignment with their group's major axis. We further explore BSG alignment using the semi-analytic model (SAM) constructed by Guo et al. In general, we found good agreement of the model with observations: BSGs in the SAM show a strong major-axis alignment that depends on group mass and richness in the same way as in observations and none of the other satellites exhibit prominent alignment. However, a discrepancy also exists in that the SAM shows a BSG color dependence opposite of that in observations, which is most probably induced by a missing large-scale environment ingredient in the SAM. The combination of two popular scenarios can explain the BSG alignment we detected. First, satellites merged into the group along the surrounding filaments, which are strongly aligned with the major axis of the group. Second, BSGs entered their host group more recently than other satellites, so they have preserved more information about their assembling history and major-axis alignment. In the SAM, we found positive evidence for the second scenario in the fact that BSGs merged into groups statistically more recently than other satellites. We also found that most of the BSGs (80%) were BCGs before they merged into groups and earlier merging BSGs tend to be closer to their BCGs than other BSGs. On the other hand, although the BSG color dependence in observations is the opposite of that in the SAM, it might also indicate that the first scenario is a good explanation. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000317960500020 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5923]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China 4.Shang Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 5.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China 6.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 7.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA |
| 推荐引用方式 GB/T 7714 | Li, Zhigang,Wang, Yougang,Yang, Xiaohu,et al. BRIGHTEST SATELLITE GALAXY ALIGNMENT OF SLOAN DIGITAL SKY SURVEY GALAXY GROUPS[J]. ASTROPHYSICAL JOURNAL,2013,768(1). |
| APA | Li, Zhigang,Wang, Yougang,Yang, Xiaohu,Chen, Xuelei,Xie, Lizhi,&Wang, Xin.(2013).BRIGHTEST SATELLITE GALAXY ALIGNMENT OF SLOAN DIGITAL SKY SURVEY GALAXY GROUPS.ASTROPHYSICAL JOURNAL,768(1). |
| MLA | Li, Zhigang,et al."BRIGHTEST SATELLITE GALAXY ALIGNMENT OF SLOAN DIGITAL SKY SURVEY GALAXY GROUPS".ASTROPHYSICAL JOURNAL 768.1(2013). |
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来源：国家天文台
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