论文标题
来自KV450宇宙剪切分析的重型反馈测量
Baryonic feedback measurement from KV450 cosmic shear analysis
论文作者
论文摘要
虽然Baryonic反馈是我们需要解决的最重要的天体物理系统之一，以实现精确的宇宙学，但很少有弱透镜研究直接衡量了其对物质功率谱的影响。我们报告了对重型反馈参数的测量，并在其宇宙剪切中的下限和上限上的约束。我们使用Kilo-Agree调查中的公共数据和跨越450度$^2 $的Vista kilo-Vegreared Galaxy调查。 Estimating both cosmological and feedback parameters simultaneously, we obtain $A_{\rm b}=1.01_{-0.85}^{+0.80}$, which shows a consistency with the dark matter-only (DMO) case at the $\sim1.2~σ$ level and a tendency toward positive feedback; $ a _ {\ rm b} = 0 $（$ 0.81 $）值对应于DMO（OWLS AGN）情况。尽管对反馈参数有完全限制，但我们的$ s_8〜（\equivσ_8\ sqrt {ω_m / 0.3}）$测量（$ 0.739^{+0.036} _ { - 0.035} $）偏移仅限量$ \ sim6 $％，与先前的统计级别相比，只有$ \ sim6 $％。当我们假设由九年的威尔金森微波各向异性探针（Planck）结果偏爱的平面$λ$ CDM宇宙学时，反馈参数被约束为$ a _ _ {\ rm b} = 1.21 _ { - 0.54}在$ \ sim2.2〜σ $（$ \ sim3.1〜σ $）级别上排除DMO情况。
While baryonic feedback is one of the most important astrophysical systematics that we need to address in order to achieve precision cosmology, few weak lensing studies have directly measured its impact on the matter power spectrum. We report measurement of the baryonic feedback parameter with the constraints on its lower and upper limits from cosmic shear. We use the public data from the Kilo-Degree Survey and the VISTA Kilo-Degree Infrared Galaxy Survey spanning 450 deg$^2$. Estimating both cosmological and feedback parameters simultaneously, we obtain $A_{\rm b}=1.01_{-0.85}^{+0.80}$, which shows a consistency with the dark matter-only (DMO) case at the $\sim1.2~σ$ level and a tendency toward positive feedback; the $A_{\rm b}=0$ ($0.81$) value corresponds to the DMO (OWLS AGN) case. Despite this full constraint of the feedback parameter, our $S_8~(\equiv σ_8 \sqrt{Ω_m / 0.3})$ measurement ($0.739^{+0.036}_{- 0.035}$) shifts by only $\sim6$% of the statistical error, compared to the previous measurement. When we assume the flat $Λ$CDM cosmology favored by the Nine-Year Wilkinson Microwave Anisotropy Probe (Planck) result, the feedback parameter is constrained to be $A_{\rm b}=1.21_{-0.54}^{+0.61}$ ($1.60_{-0.52}^{+0.53}$), which excludes the DMO case at the $\sim2.2~σ$ ($\sim3.1~σ$) level.
