Power spectrum of intrinsic alignments of galaxies in IllustrisTNG

@article{Shi2020PowerSO,
  title={Power spectrum of intrinsic alignments of galaxies in IllustrisTNG},
  author={Jingjing Shi and Toshiki Kurita and Masahiro Takada and Ken Osato and Yosuke Kobayashi and Takahiro Nishimichi},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2020},
  volume={2021}
}
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… 
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References

SHOWING 1-10 OF 116 REFERENCES
Galaxy shapes and intrinsic alignments in the MassiveBlack-II simulation
The intrinsic alignment of galaxy shapes with the large-scale density field is a contaminant to weak lensing measurements, as well as being an interesting signature of galaxy formation and evolution
Intrinsic alignments of disc and elliptical galaxies in the MassiveBlack-II and Illustris simulations
We study the shapes and intrinsic alignments of disks and elliptical galaxies in the MassiveBlack-II (MBII) and Illustris cosmological hydrodynamic simulations, with volumes of $(100h^{-1}Mpc)^{3}$
Galaxy shapes and alignments in the MassiveBlack-II hydrodynamic and dark matter-only simulations
We compare the shapes and intrinsic alignments of galaxies in the MassiveBlack-II cosmological hydrodynamic simulation (MBII) to those in a dark matter-only (DMO) simulation performed with the same
The role of mergers and halo spin in shaping galaxy morphology
Mergers and the spin of the dark matter halo are factors traditionally believed to determine the morphology of galaxies within a $\Lambda$CDM cosmology. We study this hypothesis by considering
Power spectrum of halo intrinsic alignments in simulations
We use a suite of $N$-body simulations to study intrinsic alignments (IA) of halo shapes with the surrounding large-scale structure in the $\Lambda$CDM model. For this purpose, we develop a novel
Intrinsic alignments of galaxies in the MassiveBlack-II simulation: Analysis of two-point statistics
The intrinsic alignment of galaxies with the large-scale density field in an important astrophysical contaminant in upcoming weak lensing surveys. We present detailed measurements of the galaxy
Intrinsic alignments of SDSS-III BOSS LOWZ sample galaxies
Intrinsic alignments (IA) of galaxies, i.e. correlations of galaxy shapes with each other (II) or with the density field (gI), are potentially a major astrophysical source of contamination for weak
First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
The IllustrisTNG project is a new suite of cosmological magneto-hydrodynamical simulations of galaxy formation performed with the Arepo code and updated models for feedback physics. Here we introduce
Beyond linear galaxy alignments
Galaxy intrinsic alignments (IA) are a critical uncertainty for current and future weak lensing measurements. We describe a perturbative expansion of IA, analogous to the treatment of galaxy biasing.
Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample
Correlations between the intrinsic shapes of galaxies and the large-scale galaxy density field provide an important tool to investigate galaxy intrinsic alignments, which constitute the major
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