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Selforganizology, 2021, 8(3-4): 7-20
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Article

Centralities of galaxies in the weighted network model of the Local Group

Emir Haliki
Department of Physics, Faculty of Science, Ege University, Izmir, Turkey

Received 15 June 2021;Accepted 25 June 2021;Published 1 December 2021
IAEES

Abstract
Little is known about the structures and characteristics of the networks behind galaxy clusters. Considering that the essential interaction between the elements of a cluster is the gravitational attraction, the study has modeled the Local Group, a local galaxy cluster of which the Milky Way is a member, as a weighted network according to gravitational attraction. After the galaxies' unknown masses have been calculated from their apparent and absolute magnitudes, the gravitational attraction matrix, being the adjacency matrix of the network, would be formed from the matrix of their positions relative to each other. Various centrality measurements known as fundamental network metrics were thus performed to determine if the massive galaxies of the cluster have high centrality values. In the proposed weighted network model, direct and indirect correlations have been observed between centrality values and masses of the galaxies.

Keywords network;centrality;gravity;Milky Way;Local Group.

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