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• W2735862242 abstract "I present a high resolution study of the impact of realistic satellite galaxies, extractedfrom cosmological simulations of Milky Way-like haloes including 6 Aquarius and oneVia Lactea II suites, on the dynamics of the Galactic disc. The initial conditions for themulti-component Milky Way galaxy were generated, to ensure an isolated system in adynamical equilibrium state. After analysing the statistical properties of the subhaloes,candidates likely to impact the disc with the initial mass,tidal mass > 10^8 solar mass, were identified,inserted into our high resolution N-body simulations and evolved for 2 Gyr. I quantifiedthe vertical heating due to such impacts by measuring the disc thickness and squaredvertical velocity dispersion across the disc.According to our analysis, the strength of the heating is strongly dependent onthe high mass end of the subhalo distribution from cosmological simulations. The meanincrease of the vertical dispersion is approximately 20 km^2/s^2/Gyr for R > 4 kpc with a flat radialprofile. Excluding Aq-F2 results with a very massive perturber with tidal mass = 6.10^10 solar mass, themean heating is less than 12 km^^2/s^2/Gyr. These heating values correspond to 28%and 17% of the observed vertical heating rate in the solar neighbourhood, respectively.Taking into account the statistical dispersion around the mean, we miss the observedheating rate by more than 3 sigma. I observed a general flaring of the disc height in the caseof all 7 simulations in the outer parts.The dynamics of the disc in the presence of satellites was also studied in the finaltwo chapters where the selected runs were extended to 4 Gyr. The infall of satellitescan be responsible for delaying/advancing the bar-formation, depending on the crossingepoch. The passage influences the bar-formation, if the passage occurs between the endof the shot noise regime T1 (0.75 Gyr) and before the exponential growth T2. TheAq-F2 run with the most massive candidate, induces localised vertical heating in theouter disc with R > 15 kpc.I also observed signatures of radial oscillatory behaviour in the outer disc plane,with features similar to that of the Monoceros ring. Disc warping is prominent after3 Gyr of evolution, reaching median z coordinate of approximately 4 kpc. The asymmetric m = 1 mode is dominantfor R > 15 kpc in the form of vertical motion, with the m = 2 mode influencing therotation of disc particles." @default.
• W2735862242 created "2017-07-21" @default.
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• W2735862242 date "2016-01-01" @default.
• W2735862242 modified "2023-09-23" @default.
• W2735862242 title "Impact of cosmological satellite galaxies on the dynamics of the Milky Way disc" @default.
• W2735862242 doi "https://doi.org/10.11588/heidok.00022278" @default.
• W2735862242 hasPublicationYear "2016" @default.
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