arXiv 1706.033242017-06-11astro-ph.GA

强引力透镜对暗物质晕的重子效应

Baryon effects on the dark matter halos constrained from strong gravitational lensing

Lin Wang, Da-Ming Chen, Ran Li

备注：: 10 pages, 8 figures, MNRAS accepted
DOI：: 10.1093/mnras/stx1617

摘要：

模拟有望成为研究暗物质晕中重子效应的有力工具。最近的高分辨率，宇宙学流体动力学模拟（\citealt{Cintio14}，DC 14）预测DM晕的内部密度分布系统地依赖于恒星DM质量比（$M_{\ast}/M_{\rm halo}$），这被认为是能够提供良好的拟合所观察到的星系的旋转曲线。DC 14轮廓是从仅限于$M_{\rm halo}\le 10^{12}M_{\sun}$的模拟中拟合的，为了研究可能影响所有晕的物理过程，我们将其外推到更大的晕质量，包括星系团。低晕质量时DC 14曲线的内斜率较平坦，当晕质量向$10^{12}M_{\sun}$方向增加时，内斜率接近1，之后迅速减小。我们使用DC 14轮廓的镜头，发现它预测太少的镜头相比，最近的强透镜观测SQLS（\citealt{Inada12}）。我们还计算了强透镜概率的模拟密度剖面，继续晕质量从质量端的DC 14（$\sim 10^{12}M_{\sun}$）的质量，覆盖星系团（\citealt{Schaller15}，Süber15），并发现，这个Süber15模型预测太多的透镜相比，其他模型和SQLS的观测。有趣的是，Sjer15剖面没有核心，但是，像DC 14一样，模拟的旋转曲线与观测数据非常一致。此外，我们表明，标准的两个人口模型SIS+NFW不能匹配最近的SQLS观测大图像分离。

英文摘要：

Simulations are expected to be the powerful tool to investigate the baryon effects on dark matter (DM) halos. Recent high resolution, cosmological hydrodynamic simulations (\citealt{Cintio14}, DC14) predict that the inner density profiles of DM halos depend systematically on the ratio of stellar to DM mass ($M_{\ast}/M_{\rm halo}$) which is thought to be able to provide good fits to the observed rotation curves of galaxies. The DC14 profile is fitted from the simulations which are confined to $M_{\rm halo}\le 10^{12}M_{\sun}$, in order to investigate the physical processes that may affect all halos, we extrapolate it to much larger halo mass, including that of galaxy clusters. The inner slope of DC14 profile is flat for low halo mass, it approaches 1 when the halo mass increases towards $10^{12}M_{\sun}$ and decreases rapidly after that mass. We use DC14 profile for lenses and find that it predicts too few lenses compared with the most recent strong lensing observations SQLS (\citealt{Inada12}). We also calculate the strong lensing probabilities for a simulated density profile which continues the halo mass from the mass end of DC14 ($\sim 10^{12}M_{\sun}$) to the mass that covers the galaxy clusters (\citealt{Schaller15}, Schaller15), and find that this Schaller15 model predict too many lenses compared with other models and SQLS observations. Interestingly, Schaller15 profile has no core, however, like DC14, the rotation curves of the simulated halos are in excellent agreement with observational data. Furthermore, we show that the standard two-population model SIS+NFW cannot match the most recent SQLS observations for large image separations.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文