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Title |
Profiles of cosmic structures out to the turnaround scale |
Alternative Title |
Ακτινικά προφίλ σμηνών γαλαξιών στην κλίμακα διαφυγής |
Author
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Κορκίδης, Γεώργιος
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Thesis advisor
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Παυλίδου, Βασιλική
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Abstract |
In this work, we use a suit of dark matter cosmological simulations to examine the
turnaround radius of galaxy clusters, as predicted from the spherical collapse model in
a ΛCDM Universe. For that purpose we calculate radial velocity profiles in which the
turnaround radius becomes clearly apparent as the largest non-expanding scale around
a center of gravity. The radius beyond which the spherically averaged radial velocity of
dark matter particles in galaxy clusters becomes positive, is found to be in good agreement with the turnaround radius predicted analytically by the spherical collapse model
of structure formation. This is true although simulated dark matter halos are highly non
spherical. Moreover, through these profiles, we demonstrate that the turnaround radius
is a much better defined boundary for the structures - in contrast to the ’Virial’ radius
commonly used, the estimation of which is based on a constant over-density argument.
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Language |
English |
Issue date |
2018-11-23 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/3/b/3/metadata-dlib-1652966049-89990-16209.tkl
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Views |
136 |