论文标题
Illustristng中星系内在比对的功率谱
Power Spectrum of Intrinsic Alignments of Galaxies in IllustrisTNG
论文作者
论文摘要
我们介绍了3- {\ IT维}固有的对齐功率谱之间的预测2D星系形状/自旋与3D潮汐领域之间的$ 0.1 <k/h {\ rm mpc}^{ - 1}^{ - 1} <60 $,使用宇宙学水动力学模拟,插图tng300 $ 0.3 $ 0.3 $ 0.3 $ 0.3形状潮汐场对准随着星系质量的增加而增加,线性比对系数$ a _ {\ rm ia} $(根据原始潮汐场定义,被发现具有较弱的红移依赖性。我们还显示了恒星质量质量样品的形状/自旋潮汐场比对的有前途检测,以及用于TNG300体积的星形星系的弱或几乎无效的信号,$ \ sim 0.01〜(H^{ - 1} {\ rm GPC} {\ rm GPC})^3 $。我们进一步研究了固有比对功率谱的形态和环境依赖性。巨大的盘和球形 - 甲状腺素的形状倾向于与潮汐场保持一致。低质量盘(低红移时球体)的自旋倾向于与潮汐场平行,而大型球体和磁盘的自旋倾向于垂直于潮汐场。在小规模和大尺度上,巨大的中心的形状和自旋与潮汐场保持一致。卫星在一个halo项区域内显示径向对齐,低质量卫星在两个途径项区域中具有有趣的比对信号。我们还预测,用于测量光谱和成像调查(例如Subaru HSC/PFS和DESI)的固有比对功率谱的可行性。因此,我们的结果表明,星系固有的比对可以用作约束星系形成模型的有前途的工具。
We present the 3-{\it dimensional} intrinsic alignment power spectra between the projected 2d galaxy shape/spin and the 3d tidal field across $0.1<k/h{\rm Mpc}^{-1}<60$ using cosmological hydrodynamical simulation, Illustris-TNG300, at redshifts ranging from $0.3$ to $2$. The shape-tidal field alignment increases with galaxy mass and the linear alignment coefficient $A_{\rm IA}$, defined with respect to the primordial tidal field, is found to have weak redshift dependence. We also show a promising detection of the shape/spin-tidal field alignments for stellar mass limited samples and a weak or almost null signal for star-forming galaxies for the TNG300 volume, $\sim 0.01~(h^{-1}{\rm Gpc})^3$. We further study the morphology and environmental dependence of the intrinsic alignment power spectra. The shape of massive disk- and spheroid-galaxies tend to align with the tidal field. The spin of low mass disks (and spheroids at low redshifts) tend to be parallel with the tidal field, while the spin of massive spheroids and disks tend to be perpendicular to tidal field. The shape and spin of massive centrals align with the tidal field at both small and large scales. Satellites show a radial alignment within the one-halo term region, and low mass satellites have an intriguing alignment signal in the two-halo term region. We also forecast a feasibility to measure the intrinsic alignment power spectrum for spectroscopic and imaging surveys such as Subaru HSC/PFS and DESI. Our results thus suggest that galaxy intrinsic alignment can be used as a promising tool for constraining the galaxy formation models.