SIMBAD references

The possibility of the explanation of the large-scale peculiar velocity field around the Local Group (LG) as a result of gravitational action of high-amplitude Great Attractor-like fluctuations of a random Gaussian density field in the Friedmann flat cosmological models with cold, hot and mixed dark matter is investigated. Under the assumption that the observable peculiar velocity field is a result of joint action of Great Attractor (GA), Shapley Concentration (ShC) and the large-scale bulk flow component (besides infall to Virgo and the Local Anomaly, which are of smaller scale) the necessary parameters of peak-precursors of GA and ShC are evaluated, their evolution from early linear stages to present-day is simulated and conditions of realisation of such peaks in different cosmological models are analysed. It is shown, that in case of predomination of one source of velocity field - GA - the corresponding peak-precursor has the overdensity δ=(1/2)/(z+1) and characteristic half-amplitude radius R_δ/2=(20/25)/(z+1)h^–1Mpc for redshifts z≫1, but the concentration of such peaks is very poor in all models considered. Besides the peculiar velocity field, such peaks are able to generate hot and cold spots on the cosmic microwave background sky which are accessible to registration by existing techniques. Some of these peaks may show violent dynamical relaxation in central regions. It is shown, that the possibility of the generation of the large-scale velocity component with U_LG=535km/s and even with U_LG=300km/s via gravitational action of ShC will be insignificant. From the models considered, the preferable one is joint action of the smaller GA, which contributes a peculiar velocity of the LG U_LG≃235km/s, and the large-scale bulk flow component with amplitude of ≃300km/s.