Environmental influence of voids on dark matter halos

Mansour, Jad Alexandru (2021) Environmental influence of voids on dark matter halos. Master's Thesis / Essay, Astronomy.

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Abstract

The project explores the properties of halos in the interior of Cosmic Voids. The study is based on a GADGET-2 N-body simulation. The voids within the simulation have been identified using the Watershed Void Finder. In addition, the halos have been identified in the particle distribution using the Rockstar Halo Finder. Furthermore, the convex hull algorithm has been used to specifically locate halos within voids. We found that voids have a characteristic size of 17 Mpc and tend to be more prolate in shape. Furthermore, a correlation between the sizes and shapes of voids suggest that larger voids tend to be more round. We computed the density profiles which indicate that voids present underdense interiors and are surrounded by high density ridges. We also calculated the velocity profiles and showed that in the interior of voids, velocity increases linearly. At further radii, a drastic increase in velocity develops. We investigated the halo abundance and found that the percentage of halos residing within voids is ~11%. The halo mass function revealed that void halos present lower masses than the overall halo population. We also show that there exists a systematic decreasing trend of the spin of void halos as a function of their distance from the void boundary. The shapes of the void halos reveal that they are slightly flattener than their overall counterparts. A decreasing trend has also been observed in the halo shapes as a function of distance from the boundary.

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Weijgaert, M.A.M. van de
Degree programme:	Astronomy
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	31 Aug 2021 14:20
Last Modified:	31 Aug 2021 14:20
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/25952

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