Bulletin of Taras Shevchenko National University of Kyiv. Astronomy, no. 55, p. 46-48 (2017)

Large-scale galactic motions: test of the Dipole Repeller model with the RFGC galaxies data

Parnovsky S., Dr. Sci.,
Astronomical observatory of the Taras Shevchenko National University of Kyiv, Kyiv

Abstract
The paper “The Dipole Repeller” in Nature Astronomy by Hoffman et al. state that the local large-scale galactic flow is dominated by a single attractor – associated with the Shapley Concentration – and a single previously unidentified repeller. We check this hypothesis using the data for 1459 galaxies from RFGC catalogue with distances up to 100 h–1 Mpc. We compared the models with multipole velocity field for pure Hubble expansion and dipole, quadrupole and octopole motion with the models with two attractors in the regions indicated by Hoffman et al with the multipole velocity field background. The results do not support the hypothesis, but does not contradict it. In any case, the inclusion of the following multipole is more effective than the addition of two attractors. Estimations of excess mass of attractors vary greatly, even changing their sign depending on the highest multipole used in model.

Key words
Large-scale galactic motions, dipole repeller model

References
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DOI: https://doi.org/10.17721/BTSNUA.2017.55.46-48