论文标题
使用DES 3年级的小规模测量值来用宇宙剪切来限制Baryonic反馈
Constraining the Baryonic Feedback with Cosmic Shear Using the DES Year-3 Small-Scale Measurements
论文作者
论文摘要
我们使用黑暗能源调查（DES）的小尺度（DES）3年级的宇宙剪切测量值，这些测量值不包括在DES-3年度宇宙学分析中，以限制Baryonic反馈。为了建模Baryonic反馈，我们采用了一个重型校正模型，并使用数值软件包\ texttt {baccoemu}来加速对Baryonic非线性物质功率谱的评估。我们设计了分析管道以专注于重型抑制效应的约束，利用主要成分分析对Fisher预测的含义。然后，我们对男性效应的限制可以用于更好地模型，并改善重子在从下一代大规模结构调查中产生宇宙学约束中的影响。我们以$ \ sim2σ$的意义检测到对宇宙剪切测量值的抑制。一半的气体被重态反馈弹出的特征光环质量被限制为$ m_c> 10^{13.2} h^{ - 1} m _ {\ odot} $（95 \％c.l.）。最佳拟合的Baryonic抑制是$ \ sim 5 \％$ at $ k = 1.0 {\ rm mpc} \ h^{ - 1} $和$ \ sim 15 \％$ at $ k = 5.0 {\ rm mpc} \ rm mpc} \ h^{ - 1} $。我们的发现在关于宇宙学参数，重型模型的细节和内在比对的假设方面是强大的。
We use the small scales of the Dark Energy Survey (DES) Year-3 cosmic shear measurements, which are excluded from the DES Year-3 cosmological analysis, to constrain the baryonic feedback. To model the baryonic feedback, we adopt a baryonic correction model and use the numerical package \texttt{Baccoemu} to accelerate the evaluation of the baryonic nonlinear matter power spectrum. We design our analysis pipeline to focus on the constraints of the baryonic suppression effects, utilizing the implication given by a principal component analysis on the Fisher forecasts. Our constraint on the baryonic effects can then be used to better model and ameliorate the effects of baryons in producing cosmological constraints from the next generation large-scale structure surveys. We detect the baryonic suppression on the cosmic shear measurements with a $\sim 2 σ$ significance. The characteristic halo mass for which half of the gas is ejected by baryonic feedback is constrained to be $M_c > 10^{13.2} h^{-1} M_{\odot}$ (95\% C.L.). The best-fit baryonic suppression is $\sim 5\%$ at $k=1.0 {\rm Mpc}\ h^{-1}$ and $\sim 15\%$ at $k=5.0 {\rm Mpc} \ h^{-1}$. Our findings are robust with respect to the assumptions about the cosmological parameters, specifics of the baryonic model, and intrinsic alignments.
