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Identifier

000443248

Title

Identification of clusters in observational and mock galaxy catalogs

Alternative Title

Αναγνώριση γαλαξιακών σμηνών σε καταλόγους γαλαξιών και προσομειώσεις

Author

Σαβαθράκης, Γεώργιος Κ.

Thesis advisor

Ζέζας, Ανδρέας

Abstract

Galaxy clusters are large gravitationally bound structures that consist of a wide range of galaxies. An important objective when studying galaxy clusters is to determine their shape and number of galaxies. In this work, we propose a numerical method to define the boundaries of possible clusters based on a variation of the k Nearest Neighbors (kNN) algorithm and Monte Carlo sampling methods. We obtained the data on which our analysis was conducted, from the Heraklion Extragalactic Catalogue (HECATE), which provides the names and coordinates of specific galaxies, as well as from the Extended Virgo Cluster Catalogue (EVCC) which provides the coordinates of galaxies that belong to the Virgo cluster, and were used as a validation of our method. We conclude that our method successfully identifies the locations of clusters and determines their shape.

Language

English

Issue date

2021-11-19

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses

Type of Work--Post-graduate theses

Views

304

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