Halo Radius (Splashback Radius) of Groups and Clusters of Galaxies on Small Scales

We report the results of a study of the distribution of galaxies in the projection along the radius ( ) for 157 groups and clusters of galaxies in the local Universe (0.01 < < 0.10) with line-of-sight velocity dispersions 200 < < 1100 km s –1 . We introduce a new observed boundary for th...

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Bibliographic Details
Published in:Astrophysical bulletin 2022-12, Vol.77 (4), p.347-360
Main Authors: Kopylova, F. G., Kopylov, A. I.
Format: Article
Language:English
Subjects:
Astronomy
Astronomy & Astrophysics
Astrophysics and Cosmology
Dark matter
Galactic clusters
Galactic halos
Galaxy distribution
Local group (astronomy)
Physics
Physics and Astronomy
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Summary:We report the results of a study of the distribution of galaxies in the projection along the radius ( ) for 157 groups and clusters of galaxies in the local Universe (0.01 < < 0.10) with line-of-sight velocity dispersions 200 < < 1100 km s –1 . We introduce a new observed boundary for the halos of clusters of galaxies, which we identify with the splashback radius . We also identified the core of groups/clusters of galaxies with the radius . These radii are determined by the observed integrated distribution of the number of galaxies as a function of squared angular radius from the center of the group/cluster, which (usually) coincides with the brightest galaxy. We found for the entire sample that the boundary of dark matter for groups/clusters of galaxies is proportional to the radius of the virialized region. We measured the mean radius Mpc for groups of galaxies ( km s –1 ) and Mpc for clusters of galaxies ( km s –1 ). The mean ratio of radii is , or .
ISSN:1990-3413
1990-3421
DOI:10.1134/S199034132204006X