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- W4281674310 endingPage "A61" @default.
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- W4281674310 abstract "Context. The impact of Sagittarius and other satellite galaxies such as the Large Magellanic Cloud on our Galaxy and in particular its disc is gradually being disclosed. Simulations tailored to the interaction of the Milky Way (MW) and Sagittarius show rings and spiral arms appearing in the Galaxy disc. However, spiral arms can also be induced by the bar or by disc instabilities. Aims. We aim to study the dynamics of tidally induced spiral arms in the context of the different encounters with Sagittarius and determine their kinematic signatures in the shape of ridges and waves in angular momentum, similar to those detected with Gaia DR2. Methods. We built toy models of the interaction between a host and a satellite galaxy using orbital integrations after a tidal distant encounter. We derived analytically the shape of the structures seen in phase space as a function of time for simple power-law potential models. We compared these models to a more realistic N -body simulation of the MW Sagittarius-like interaction and also to real data from Gaia DR3. Results. As previously found, an impulsive distant tidal approach of a galactic satellite generates a kick in velocities that leads to a two-armed spiral structure. The arms are made of orbits in between their apocentres and pericentres, thus, they correspond to regions with average negative galactocentric radial velocity. The two-arm pattern rotates at an angular speed of ω − 1/2 κ which depends on Galactocentric radius, thus causing winding with time range of 0.8–2.1 Gyr, respectively. This winding produces ridges in the R − V ϕ projection with alternating signs of V R and oscillations of V R in the L Z − ϕ space, similar to those observed in the Gaia data. The frequency of these kinematic features increases with time, offering a powerful means to infer the potential and the perturbation’s onset time and azimuthal phase. Fourier analysis allows us to date the impact times of simple models and even to date perturbations induced from subsequent pericentric passages that appear as simultaneous waves. For the MW, the Fourier analysis indicates a superposition of two different frequencies, confirming previous studies. Assuming that both are due to impulsive and distant pericentre passages, we find perturbation times < 0.6 Gyr and in the range of 0.8–2.1 Gyr. The latter is compatible with a previous pericentre of Sagittarius and would be associated to about four wraps of the spiral arms in the observed radial range. Conclusions. Further work on the self-gravitating response of galactic discs and possible degeneracies with secular processes induced by the bar is necessary. Our study is a first step towards shedding more light on the elusive structure and dynamics of the spiral arms of the Galaxy." @default.
- W4281674310 created "2022-06-13" @default.
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- W4281674310 date "2022-12-01" @default.
- W4281674310 modified "2023-10-14" @default.
- W4281674310 title "Tidally induced spiral arm wraps encoded in phase space" @default.
- W4281674310 cites W147232447 @default.
- W4281674310 cites W1621311481 @default.
- W4281674310 cites W1631788275 @default.
- W4281674310 cites W1663849481 @default.
- W4281674310 cites W1782354873 @default.
- W4281674310 cites W1980145009 @default.
- W4281674310 cites W1984166139 @default.
- W4281674310 cites W1996235392 @default.
- W4281674310 cites W1997319411 @default.
- W4281674310 cites W2010791697 @default.
- W4281674310 cites W2012780054 @default.
- W4281674310 cites W2020951456 @default.
- W4281674310 cites W2021256493 @default.
- W4281674310 cites W2029107953 @default.
- W4281674310 cites W2041542911 @default.
- W4281674310 cites W2045123060 @default.
- W4281674310 cites W2055327934 @default.
- W4281674310 cites W2057634812 @default.
- W4281674310 cites W2067692551 @default.
- W4281674310 cites W2068185017 @default.
- W4281674310 cites W2080259687 @default.
- W4281674310 cites W2083950714 @default.
- W4281674310 cites W2085357651 @default.
- W4281674310 cites W2091416343 @default.
- W4281674310 cites W2092358536 @default.
- W4281674310 cites W2102702115 @default.
- W4281674310 cites W2110563485 @default.
- W4281674310 cites W2121480729 @default.
- W4281674310 cites W2136206232 @default.
- W4281674310 cites W2136396438 @default.
- W4281674310 cites W2148196215 @default.
- W4281674310 cites W2150525285 @default.
- W4281674310 cites W2170011509 @default.
- W4281674310 cites W2171582647 @default.
- W4281674310 cites W2288093105 @default.
- W4281674310 cites W2307353140 @default.
- W4281674310 cites W2485876312 @default.
- W4281674310 cites W2756342987 @default.
- W4281674310 cites W2762263554 @default.
- W4281674310 cites W2771350081 @default.
- W4281674310 cites W2795800893 @default.
- W4281674310 cites W2798336535 @default.
- W4281674310 cites W2799258675 @default.
- W4281674310 cites W2806837809 @default.
- W4281674310 cites W2883334038 @default.
- W4281674310 cites W2885165999 @default.
- W4281674310 cites W2885398871 @default.
- W4281674310 cites W2885733378 @default.
- W4281674310 cites W2889738060 @default.
- W4281674310 cites W2890062369 @default.
- W4281674310 cites W2890840461 @default.
- W4281674310 cites W2891905216 @default.
- W4281674310 cites W2915081804 @default.
- W4281674310 cites W2915335745 @default.
- W4281674310 cites W2936510424 @default.
- W4281674310 cites W2941665051 @default.
- W4281674310 cites W2950976758 @default.
- W4281674310 cites W2952476747 @default.
- W4281674310 cites W2962793548 @default.
- W4281674310 cites W2980559991 @default.
- W4281674310 cites W2999587372 @default.
- W4281674310 cites W3016941830 @default.
- W4281674310 cites W3022113312 @default.
- W4281674310 cites W3033536702 @default.
- W4281674310 cites W3083130550 @default.
- W4281674310 cites W3097863145 @default.
- W4281674310 cites W3098221464 @default.
- W4281674310 cites W3098590164 @default.
- W4281674310 cites W3099291156 @default.
- W4281674310 cites W3100151620 @default.
- W4281674310 cites W3101118352 @default.
- W4281674310 cites W3102170014 @default.
- W4281674310 cites W3103596473 @default.
- W4281674310 cites W3105487931 @default.
- W4281674310 cites W3105542459 @default.
- W4281674310 cites W3105645544 @default.
- W4281674310 cites W3109313167 @default.
- W4281674310 cites W3111394822 @default.
- W4281674310 cites W3113327126 @default.
- W4281674310 cites W3127637765 @default.
- W4281674310 cites W3134068331 @default.
- W4281674310 cites W3150256079 @default.
- W4281674310 cites W3167587167 @default.
- W4281674310 cites W3200658780 @default.
- W4281674310 cites W3217084555 @default.
- W4281674310 cites W4200004652 @default.
- W4281674310 cites W4200486006 @default.