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Network analysis of the COSMOS galaxy field | | R. de Regt
; S. Apunevych
; C. von Ferber
; Yu. Holovatch
; B. Novosyadlyj
; | | Date: |
4 Jul 2017 | | Abstract: | The complex network analysis of COSMOS galaxy field for R.A. = 149.4 deg -
150.4 deg and Decl. = 1.7 deg - 2.7 deg is presented. 2D projections of spatial
distributions of galaxies in three redshift slices 0.88-0.91, 0.91-0.94 and
0.94-0.97 are studied. We analyse network similarity/peculiarity of different
samples and correlations of galaxy astrophysical properties (colour index and
stellar mass) with their topological environments. For each slice the local and
global network measures are calculated. Results indicate a high level of
similarity between geometry and topology of different galaxy samples. We found
no clear evidence of evolutionary change in network measures for different
slices. Most local network measures have non-Gaussian distributions, often bi-
or multi-modal. The distribution of local clustering coefficient C manifests
three modes which allow for discrimination between stand-alone singlets and
dumbbells (0 <= C < 0.1), intermediately packed galaxies (0.1 <= C < 0.9) and
cliques (0.9 <= C <= 1). Analysing astrophysical properties, we show that mean
values and distributions of galaxy colour index and stellar mass are similar in
all slices. However, statistically significant correlations are found if one
selects galaxies according to different modes of C distribution. The
distribution of stellar mass for galaxies with interim C differ from the
corresponding distributions for stand-alone and clique galaxies. This
difference holds for all redshift slices. Besides, the analogous difference in
the colour index distributions is observed only in the central redshift
interval. | | Source: | arXiv, 1707.0978 | | Services: | Forum | Review | PDF | Favorites | |
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