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• W1990694624 abstract "Using stellar-dynamical calculations it is shown for the fir st time that counter-orbiting material emerges naturally i n tidal interactions of disc galaxies. Model particles on both pro- and retrograde orbits can be formed as tidal debris in single encounters with disc galaxies of 1-to-1 and 4-to-1 mass ratios. A total of 74 model calculations are performed for a range of different initial parameters. Interactions include fly-by and merger cases. The fraction o f counter-orbiting material produced varies over a wide range (from a few up to 50 percent). All fly-by models show a similar two-pha se behaviour, with retrograde material forming first. Prope rties of the prograde and retrograde populations are extracted to make an observational discrimination possible. During such encounters the tidal debris occupies a certain region in phase space. In this material, tidal-dwarf galaxie s may form. The modelling therefore can explain why galaxies may have dwarf galaxies orbiting counter to the bulk of their dwarf gala xies. An example is the Sculptor dwarf of the Milky Way, which orbits counter to the bulk of the disc of satellites. The modelling th us supports the scenario of the MW satellites being ancient tidal-dwarf galaxies formed from gaseous material stripped from another galaxy during an encounter with the young MW. A possible candidate for this galaxy is identified as the Mage llanic Cloud progenitor galaxy. Its angular motion fits the a ngular motion of the MW disc of satellites objects. This scenario is in agre ement with Lynden-Bell’s original suggestion for the origi n of the dSph satellites and the near-unbound orbit of the LMC." @default.
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• W1990694624 date "2011-08-01" @default.
• W1990694624 modified "2023-09-26" @default.
• W1990694624 title "Making Counter-Orbiting Tidal Debris The Origin of the Milky Way Disc of Satellites" @default.
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