AI 中文总结
本研究通过对z~2处约3000个ULIRGs的成团性分析，利用线性理论和HOD建模测量其暗晕质量，发现两个天区的ULIRGs暗晕质量存在差异，且卫星星系占比在两个天区表现不同。
AI 中文摘要
我们对COSMOS和BOOTES天区中，通过24μm流量和IRAC颜色均匀选取的约3000个红移z~2处的极亮红外星系（ULIRGs）开展了成团性分析。我们测量了两个天区中ULIRGs的角关联函数，并利用星系成团模型对其进行拟合。线性理论建模结果显示，这些ULIRGs所处暗晕的特征质量，在COSMOS天区为log M_h/(h⁻¹M⊙)=12.64±0.50，在BOOTES天区为12.72±0.13。暗晕占据分布（HOD）建模得到的、由占据数加权的有效暗晕质量，在COSMOS天区为log M_eff/(h⁻¹M⊙)=12.50⁺⁰.²⁶₋₀.₂₈，在BOOTES天区为12.89⁺⁰.¹¹₋₀.¹²。这些宿主暗晕预计会在z=0时演化成质量约为10¹³.⁶⁻¹³.⁹ h⁻¹M⊙的暗晕。HOD拟合结果表明，BOOTES天区的星系成团性中，卫星星系的贡献不可忽略，但COSMOS天区推导得到的卫星星系占比几乎为零。
英文摘要
We present a clustering analysis of $\sim 3000$ ultraluminous infrared galaxies (ULIRGs) at $z\sim 2$, uniformly selected by $24μ{\rm m}$ flux and IRAC colors in the COSMOS and BOOTES fields. We measure the angular correlation functions of ULIRGs in both fields and fit them with galaxy clustering models. Linear theory modeling shows that these ULIRGs reside in dark matter halos with characteristic masses of $\log M_{\rm h} /({h^{-1}\rm M_{\odot}}) = 12.64\pm 0.50$ in COSMOS and $12.72\pm 0.13$ in BOOTES. The halo occupation distribution (HOD) modeling yields occupation-weighted effective halo masses of $\log M_{\rm eff} /({h^{-1}\rm M_{\odot}}) =12.50^{+0.26}_{-0.28}$ for COSMOS and $12.89^{+0.11}_{-0.12}$ for BOOTES. These host halos are expected to evolve into halos with masses of $\sim 10^{13.6-13.9}\ {h^{-1}\rm M_{\odot}}$ at $z=0$. The HOD fits allow for a non-negligible satellite contribution to the clustering of galaxies in the BOOTES field, but the satellite fraction derived in the COSMOS field appears nearly zero.
Comments14 pages, 6 figures, accepted for publication in the Astrophysical Journal
