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The place of the Local Group in the cosmic web

Published online by Cambridge University Press:  12 October 2016

Jaime E. Forero-Romero  and
Roberto González
Jaime E. Forero-Romero
Affiliation:
Departamento de Física, Universidad de los Andes, Cra. 1 No. 18A-10, Edificio Ip Bogotá, Colombia email: je.forero@uniandes.edu.co
Roberto González
Affiliation:
Instituto de Astrofísica, Pontificia Universidad Católica de ChileAv. Vicuña Mackenna 4860Santiago, Chile Centro de Astro-Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860 Santiago, Chile email: regonzar@astro.puc.cl
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Abstract

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We use the Bolshoi Simulation to find the most probable location of the Local Group (LG) in the cosmic web. Our LG simulacra are pairs of halos with isolation and kinematic properties consistent with observations. The cosmic web is defined using a tidal tensor approach. We find that the LG's preferred location is regions with a dark matter overdensity close to the cosmic average. This makes filaments and sheets the preferred environment. We also find a strong alignment between the LG and the cosmic web. The orbital angular momentum is preferentially perpendicular to the smallest tidal eigenvector, while the vector connecting the two halos is strongly aligned along the the smallest tidal eigenvector and perpendicular to the largest tidal eigenvector; the pair lies and moves along filaments and sheets. We do not find any evidence for an alignment between the spin of each halo in the pair and the cosmic web.

Keywords

cosmology: large-scale structure of universecosmology:dark mattercosmology: simulationsGalaxy: formation
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. 181 - 186
Copyright
Copyright © International Astronomical Union 2016 

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