Galactic angular momenta and angular momentum couplings in the large-scale structure

Abstract

In this paper, we revisit the aquisition of angular momentum of galaxies by tidal shearing and compute the angular momentum variance sigma_L^2 as well as the angular momentum correlation function C_L(r) from a peak-restricted Gaussian random process. This stochastic process describing the initial conditions treats both the tidal shear as well as the inertia as dynamical fields and explicitly accounts for the discreteness of the inertia field. We describe the way in which the correlations in angular momentum result from an interplay of long-ranged correlations in the tidal shear, and short ranged correlations in the inertia field and which reflects the correlation between the eigensystems of these two symmetric tensors. We propose a new form of the angular momentum correlation function which is able to distinguish between parallel and antiparallel alignment of angular momentum vectors, and comment on implications of intrinsic alignments for weak lensing measurements. We confirm the scaling L/M propto. M^{2/3} and find the angular momentum distribution of Milky Way-sized haloes to be correlated on scales of ~1 Mpc/h. The correlation function can be well fitted by an empirical relation of the form C_L(r) propto. exp(-[r/r_0]^beta).

10 pages, 5 figures, submitted to MNRAS

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• The Initial Spin Probability Distribution of Primordial Black Holes
• Galaxy alignments: Theory, modelling and simulations
• Angular momentum properties of haloes and their baryon content in the Illustris simulation
• Intrinsic alignments in the cross-correlation of cosmic shear and CMB weak lensing
• Time evolution of intrinsic alignments of galaxies
• Measuring primordial non-Gaussianity with weak-lensing surveys
• The MillenniumTNG Project: Intrinsic alignments of galaxies and halos
• Formation and Morphology of the First Galaxies in the Cosmic Morning
• Angular ellipticity correlations in a composite alignment model for elliptical and spiral galaxies and inference from weak lensing
• Intrinsic alignments and 3d weak gravitational lensing
• Weak gravitational lensing of intrinsically aligned galaxies
• Parameter likelihood of intrinsic ellipticity correlations
• Intrinsic and extrinsic correlations of galaxy shapes and sizes in weak lensing data
• A theoretical estimate of intrinsic ellipticity bispectra induced by angular momenta alignments
• Spherical collapse of dark matter haloes in tidal gravitational fields
• Shear and vorticity in the spherical collapse of dark matter haloes
• Biased cosmological parameter estimation with galaxy cluster counts in the presence of primordial non-Gaussianities
• Statistical separation of weak gravitational lensing and intrinsic ellipticities based on galaxy colour information
• Effects of tidal gravitational fields in clustering dark energy models
• Why do galactic spins flip in the cosmic web? A Theory of Tidal Torques near saddles
• Environmental dependence of ellipticity correlation functions of intrinsic alignments
• The non-Gaussian distribution of galaxies gravitational fields
• Intrinsic and extrinsic gravitational flexions
• A direct detection method of galaxy intrinsic ellipticity-gravitational shear correlation in non-linear regimes using self-calibration
• Realistic systematic biases induced by residual intrinsic alignments in cosmic shear surveys
• Nuisance parameters for large galaxy surveys