热门
The influence of baryons on the clustering of matter and weak-lensing surveys
文献类型：期刊论文
| 作者 | Jing, YP; Zhang, PJ; Lin, WP; Gao, L; Springel, V |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2006-04-01 |
| 卷号 | 640期号:2页码:L119-L122 |
| 关键词 | cosmology : theory dark matter galaxies : formation gravitational lensing |
| 英文摘要 | Future weak-lensing measurements of cosmic shear will reach such high accuracy that second-order effects in weak-lensing modeling, such as the influence of baryons on structure formation, become important. We use a controlled set of high-resolution cosmological simulations to quantify this effect by comparing pure N-body dark matter runs with corresponding hydrodynamic simulations, carried out both in nonradiative form and in dissipative form with cooling and star formation. In both hydrodynamic simulations, the clustering of the gas is suppressed while that of dark matter is boosted at scales k > 1 h Mpc(-1). Despite this counterbalance between dark matter and gas, the clustering of the total matter is suppressed by up to 1% at 1 h Mpc(-1) less than or similar to k less than or similar to 10 h Mpc(-1), while for k approximate to 20 h Mpc(-1) it is boosted, up to 2% in the nonradiative run and 10% in the run with star formation. The stellar mass formed in the latter is highly biased relative to the dark matter in the pure N-body simulation. Using our power spectrum measurements to predict the effect of baryons on the weak-lensing signal at scales corresponding to multipole moments 100 < l < 10,000, we find that baryons may change the lensing power spectrum by less than 0.5% at l < 1000, but by 1% to 10% at 1000 < l < 10,000. The size of the effect exceeds the predicted accuracy of future lensing power spectrum measurements and will likely be detected. Precise determinations of cosmological parameters with weak lensing, and studies of small-scale fluctuations and clustering, therefore rely on properly including baryonic physics. |
| 学科主题 | 星系和宇宙学研究中心 |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | POWER SPECTRUM ; COSMIC MAGNIFICATION ; DARK-MATTER ; SHEAR ; SIMULATIONS ; GALAXIES ; STATISTICS ; BISPECTRUM ; MODEL ; CODE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000236360600003 |
| 公开日期 | 2010-11-08 |
| 源URL | [http://119.78.226.72//handle/331011/11835]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Max Planck Inst Astrophys, D-85748 Garching, Germany 3.Univ Durham, Sci Labs, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England |
| 推荐引用方式 GB/T 7714 | Jing, YP,Zhang, PJ,Lin, WP,et al. The influence of baryons on the clustering of matter and weak-lensing surveys[J]. ASTROPHYSICAL JOURNAL,2006,640(2):L119-L122. |
| APA | Jing, YP,Zhang, PJ,Lin, WP,Gao, L,&Springel, V.(2006).The influence of baryons on the clustering of matter and weak-lensing surveys.ASTROPHYSICAL JOURNAL,640(2),L119-L122. |
| MLA | Jing, YP,et al."The influence of baryons on the clustering of matter and weak-lensing surveys".ASTROPHYSICAL JOURNAL 640.2(2006):L119-L122. |
入库方式： OAI收割
来源：上海天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。