Power spectrum of intrinsic alignments of galaxies in IllustrisTNG
Power spectrum of intrinsic alignments of galaxies in IllustrisTNG
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DOI：
10.1088/1475-7516/2021/03/030
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发表时间：
2020-09
影响因子：
6.4
通讯作者：
Jingjing Shi;Toshiki Kurita;M. Takada;K. Osato;Yosuke Kobayashi;T. Nishimichi
中科院分区：
文献类型：
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作者：
Jingjing Shi;Toshiki Kurita;M. Takada;K. Osato;Yosuke Kobayashi;T. Nishimichi
我们利用宇宙流体动力学模拟软件Illustris-TNG 300，在红移0.3 ~ 2的范围内，给出了在0.1<k/<60范围内，投影的2d星系形状/自旋和3d潮汐场之间的三维内禀排列功率谱.形状潮汐场的排列随着星系质量和线性排列系数AIA，相对于原始潮汐场定义，被发现有弱的红移依赖。我们还显示了一个很有前途的检测的形状/自旋潮汐场对齐恒星质量有限的样品和一个微弱的或几乎为零的信号为TNG 300体积，10.01（h-1 Gpc）3的恒星形成星系。我们进一步研究了本征取向功率谱的形态和环境依赖性。大质量盘状和球状星系的形状往往与潮汐场一致。低质量盘（和低红移的球体）的自旋倾向于平行于潮汐场，而大质量球体和盘的自旋倾向于垂直于潮汐场。大质量中心的形状和旋转与潮汐场在小尺度和大尺度上都一致。卫星在单晕区表现出径向排列，而低质量卫星在双晕区表现出有趣的排列信号。我们还预测了测量光谱和成像调查，如斯巴鲁HSC/PFS和DESI的内在对齐功率谱的可行性。因此，我们的研究结果表明，星系的内在排列可以被用来作为一个有前途的工具，限制星系的形成模型。
We present the 3-dimensional intrinsic alignment power spectra between the projected 2d galaxy shape/spin and the 3d tidal field across 0.1<k/<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 AIA, 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, ∼ 0.01 (h-1 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.