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On the universality of void density profiles

Published online by Cambridge University Press:  12 October 2016

E. Ricciardelli ,
V. Quilis  and
J. Varela
E. Ricciardelli
Affiliation:
Departament d'Astronomia i Astrofisica, Universitat de Valencia, c/ Dr. Moliner 50, E-46100 - Burjassot, València, Spain email: elena.ricciardelli@gmail.com
V. Quilis
Affiliation:
Departament d'Astronomia i Astrofisica, Universitat de Valencia, c/ Dr. Moliner 50, E-46100 - Burjassot, València, Spain email: elena.ricciardelli@gmail.com Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Plaza San Juan 1, 44001 Teruel, Spain
J. Varela
Affiliation:
Observatori Astronòmic, Universitat de València, E-46980 Paterna, València, Spain
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Abstract

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The massive exploitation of cosmic voids for precision cosmology in the upcoming dark energy experiments, requires a robust understanding of their internal structure, particularly of their density profile. We show that the void density profile is insensitive to the void radius both in a catalogue of observed voids and in voids from a large cosmological simulation. However, the observed and simulated voids display remarkably different profile shapes, with the former having much steeper profiles than the latter. We ascribe such difference to the dependence of the observed profiles on the galaxy sample used to trace the matter distribution. Samples including low-mass galaxies lead to shallower profiles with respect to the samples where only massive galaxies are used, as faint galaxies live closer to the void centre. We argue that galaxies are biased tracers when used to probe the matter distribution within voids.

Keywords

cosmology: large-scale structure of universecosmology: observationsmethods: numerical
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. 551 - 554
Copyright
Copyright © International Astronomical Union 2016 

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