论文标题
用星系聚类和Galaxy-CMB透镜谱限制红外训练的不明智的星系的星系 - 途径连接
Constraining the galaxy-halo connection of infrared-selected unWISE galaxies with galaxy clustering and galaxy-CMB lensing power spectra
论文作者
论文摘要
我们介绍了对不明智的星系目录的星系与暗物质光环之间的连接的首次详细分析，这是一个由明智的数据构建的全天山，红外选择的样本，其中包含超过5亿个星系。我们使用不明智的星系 - 脉冲自动相关和Planck CMB镜头 - 透镜 - 跨相关测量值降低到10个弧形角度尺度，我们限制了Halo占用分布（HOD），一个模型，描述中心和卫星星系如何分布在三个baraxy halos中的中心和卫星均分布，均匀} exsplos n Mean samples} ex samples，均匀} e <samples paraxy samples $ samples $ samples $ samples $ samples $ samples $ samples $ semples $ samples。 0.6 $，$ 1.1 $和$ 1.5 $。我们将特征最小晕质量限制为托管中心星系，$ m_ \ mathrm {min}^\ mathrm {hod} = 1.83^{+0.41} _ { - 1.63} \ times 10^{12} M_ 10^{12} m_ \ odot/h $，$ 6.60^{+0.30} _ { - 1.11} \ times 10^{13} m_ \ odot/h $，分别为$ \ bar {z} \ of bar {z} \ of bar {z} \大约0.6 $，$ 1.1 $，$ 1.1 $和$ 1.5 $。我们发现这三个样本均由中央星系而不是卫星主导。使用我们约束的HOD模型，我们推断每个不明智的样品的有效线性星系偏置，并发现它不会像以前基于扰动理论的这些星系的分析中那样陡峭地演变而来。我们讨论了结果中可能的系统不确定性来源，其中最重要的是银河红移分布的不确定性。我们的HOD约束提供了对不明智的星系如何填充潜在的暗物质光环分布的详细，定量的理解。这些限制将对未来的研究产生直接影响，该研究采用不明智的星系作为宇宙学和天体物理探针，包括通过Sunyaev-Zel'Dovich和镜头交叉相关的电离气体热力学和暗物质概况的测量。
We present the first detailed analysis of the connection between galaxies and their dark matter halos for the unWISE galaxy catalog -- a full-sky, infrared-selected sample built from WISE data, containing over 500 million galaxies. Using unWISE galaxy-galaxy auto-correlation and Planck CMB lensing-galaxy cross-correlation measurements down to 10 arcmin angular scales, we constrain the halo occupation distribution (HOD), a model describing how central and satellite galaxies are distributed within dark matter halos, for three unWISE} galaxy samples at mean redshifts $\bar{z} \approx 0.6$, $1.1$, and $1.5$. We constrain the characteristic minimum halo mass to host a central galaxy, $M_\mathrm{min}^\mathrm{HOD} = 1.83^{+0.41}_{-1.63} \times 10^{12} M_\odot/h$, $5.22^{+0.34}_{-4.80} \times 10^{12} M_\odot/h$, $6.60 ^{+0.30}_{-1.11} \times 10^{13} M_\odot/h$ for the unWISE samples at $\bar{z}\approx 0.6$, $1.1$, and $1.5$, respectively. We find that all three samples are dominated by central galaxies, rather than satellites. Using our constrained HOD models, we infer the effective linear galaxy bias for each unWISE sample, and find that it does not evolve as steeply with redshift as found in previous perturbation-theory-based analyses of these galaxies. We discuss possible sources of systematic uncertainty in our results, the most significant of which is the uncertainty on the galaxy redshift distribution. Our HOD constraints provide a detailed, quantitative understanding of how the unWISE galaxies populate the underlying dark matter halo distribution. These constraints will have a direct impact on future studies employing the unWISE galaxies as a cosmological and astrophysical probe, including measurements of ionized gas thermodynamics and dark matter profiles via Sunyaev-Zel'dovich and lensing cross-correlations.
