Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 442, Issue 2, Pages 1887-1896Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu971
Keywords
methods: data analysis; cosmology: observations; dark matter; large-scale structure of Universe
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Funding
- Danish National Research Foundation
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The mass measurement of galaxy clusters is an important tool for the determination of cosmological parameters describing the matter and energy content of the Universe. However, the standard methods rely on various assumptions about the shape or the level of equilibrium of the cluster. We present a novel method of measuring cluster masses. It is complementary to most of the other methods, since it only uses kinematical information from outside the virialized cluster. Our method identifies objects, as galaxy sheets or filaments, in the cluster outer region, and infers the cluster mass by modelling how the massive cluster perturbs the motion of the structures from the Hubble flow. At the same time, this technique allows to constrain the three-dimensional orientation of the detected structures with a good accuracy. We use a cosmological numerical simulation to test the method. We then apply the method to the Coma cluster, where we find two galaxy sheets, and measure the mass of Coma to be M-vir = (9.2 +/- 2.4) x 10(14) M-aS (TM), in good agreement with previous measurements obtained with the standard methods.
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