Mean density of matter in the Local Universe Dmitry Makarov

Abstract

      The Local Supercluster is an ideal laboratory to study distribution of luminous and dark matter in the nearby Universe. In total, 54% of galaxies in the Local Universe are gathered into groups. The groups collect 82% of the K-band light. The local matter density is Ω_m= 0.08 within a distance of ~40 Mpc assuming H₀=73 km s^-1 Mpc^-1. It is significantly smaller than the cosmic value, 0.32, in the standard ΛCDM model. The discrepancy between the global and local quantities of Ω_m may be caused by the existence of a dark matter component unrelated to the virial masses of the galaxy systems.

Reference:
Dmitry Makarov, "Mean density of matter in the Local Universe" in Proceedings of The International Conference "SN 1987A, Quark Phase Transition in Compact Objects and Multimessenger Astronomy", Russia, Terskol (BNO INR RAS), Nizhnij Arkhyz (SAO RAS), 2-8 July 2017, INR RAS, Moscow, 2018, ISBN 978-5-94274-327-7, pp. 133-141.
DOI: 10.26119/SAO.2020.1.52324
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