论文标题
模型Boss和Eboss发光的红色星系在0.2 <z <1.0时使用Subhalo丰度与3个参数匹配
Model BOSS & eBOSS Luminous Red Galaxies at 0.2 < z < 1.0 using SubHalo Abundance Matching with 3 parameters
论文作者
论文摘要
Subhalo丰度匹配（假）是一种基于高分辨率$ n $ body仿真构建星系目录的经验方法。我们在单位模拟上使用假手术，以模拟SDSS Boss/Eboss发光红色星系（LRGS），范围内的红移范围为$ 0.2 <z <1.0 $。除了典型的假散点参数$σ$，我们还包括$ v _ {\ rm涂片} $和$ v _ {\ rm ceil} $，以考虑红移不确定性和星系不完整。这两个附加参数对于在5--25 $ \，h^{ - 1} \，{\ rm mpc} $上复制观测到的2pcf多尔尔至关重要。从最合适的$ v _ {\ rm涂片} $获得的红移不确定性与除lowz示例以外的所有SDSS LRG所测量的那些。我们探索了几种潜在的系统学，但它们都无法解释Lowz中发现的差异。我们的解释是，Lowz星系可能包含另一种类型的星系，需要对此进行不同的处理。测得的$σ$和$ v _ {\ rm ceil} $的演变也表明，eBoss星系的不完整随着红移而降低。这是在EBOSS LRG目标选择中应用的幅度下限的结果。我们的假还设定了一个完整的星系样本的星系 - 哈洛关系的内在散布的上限：$σ_{\ rm int} <0.31 $ for Lowz的$ 0.2 <z <z <0.33 $，$σ_{\ rm int} CMASS的int} <0.46 $ $ 0.43 <z <0.51 $。我们的sham星系的预计2pcf也同意2PCF拟合范围内的观察性观测。
SubHalo Abundance Matching (SHAM) is an empirical method for constructing galaxy catalogues based on high-resolution $N$-body simulations. We apply SHAM on the UNIT simulation to simulate SDSS BOSS/eBOSS Luminous Red Galaxies (LRGs) within a wide redshift range of $0.2 < z < 1.0$. Besides the typical SHAM scatter parameter $σ$, we include $v_{\rm smear}$ and $V_{\rm ceil}$ to take into account the redshift uncertainty and the galaxy incompleteness respectively. These two additional parameters are critical for reproducing the observed 2PCF multipoles on 5--25$\,h^{-1}\,{\rm Mpc}$. The redshift uncertainties obtained from the best-fitting $v_{\rm smear}$ agree with those measured from repeat observations for all SDSS LRGs except for the LOWZ sample. We explore several potential systematics but none of them can explain the discrepancy found in LOWZ. Our explanation is that the LOWZ galaxies might contain another type of galaxies which needs to be treated differently. The evolution of the measured $σ$ and $V_{\rm ceil}$ also reveals that the incompleteness of eBOSS galaxies decreases with the redshift. This is the consequence of the magnitude lower limit applied in eBOSS LRG target selection. Our SHAM also set upper limits for the intrinsic scatter of the galaxy--halo relation given a complete galaxy sample: $σ_{\rm int}<0.31$ for LOWZ at $0.2<z<0.33$, $σ_{\rm int}<0.36$ for LOWZ at $0.33<z<0.43$, and $σ_{\rm int}<0.46$ for CMASS at $0.43<z<0.51$. The projected 2PCFs of our SHAM galaxies also agree with the observational ones on the 2PCF fitting range.
