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Why do galactic spins flip in the cosmic web? A Theory of Tidal Torques near saddles

Published online by Cambridge University Press:  12 October 2016

Christophe Pichon ,
Sandrine Codis ,
Dmitry Pogosyan ,
Yohan Dubois ,
Vincent Desjacques  and
Julien Devriendt
Christophe Pichon*
Affiliation:
Institut d'Astrophysique de Paris & UPMC, 98 bis Boulevard Arago, 75014, Paris, France
Sandrine Codis
Affiliation:
Institut d'Astrophysique de Paris & UPMC, 98 bis Boulevard Arago, 75014, Paris, France
Dmitry Pogosyan
Affiliation:
University of Alberta, 11322-89 Avenue, Edmonton, Alberta, T6G 2G7, Canada
Yohan Dubois
Affiliation:
Institut d'Astrophysique de Paris & UPMC, 98 bis Boulevard Arago, 75014, Paris, France
Vincent Desjacques
Affiliation:
Université de Genève 24, quai Ernest Ansermet. 1211, Genève, Switzerland
Julien Devriendt
Affiliation:
Sub-department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH
*
†Email: pichon@iap.fr
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Abstract

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Filaments of the cosmic web drive spin acquisition of disc galaxies. The point process of filament-type saddle represent best this environment and can be used to revisit the Tidal Torque Theory in the context of an anisotropic peak (saddle) background split. The constrained misalignment between the tidal tensor and the Hessian of the density field generated in the vicinity of filament saddle points simply explains the corresponding transverse and longitudinal point-reflection symmetric geometry of spin distribution. It predicts in particular an azimuthal orientation of the spins of more massive galaxies and spin alignment with the filament for less massive galaxies. Its scale dependence also allows us to relate the transition mass corresponding to the alignment of dark matter halos' spin relative to the direction of their neighboring filament to this geometry, and to predict accordingly it's scaling with the mass of non linearity, as was measured in simulations.

Keywords

large-scale structure of universegravitational lensinggalaxies: statistics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 421 - 432
Copyright
Copyright © International Astronomical Union 2016 

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