Lia Athanassoula
Lab. Astroph. Marseille (LAM) (Marseille, France)
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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| « Évolution séculaire des galaxies à disque » |
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Lia Athanassoula |
| After a rapid formation phase, disc galaxies undergo a lengthy phase of secular evolution, which, due to its duration, can influence their properties as much, if not more than the initial formation phase. This evolution is principally driven by the bar, which redistributes both matter and angular momentum within the galaxy. Most of the angular momentum emitted from the bar region is absorbed by the dark matter halo, so that bars create a strong link between baryonic and dark matter. Thus stronger bars can be found in galaxies in which the halo has absorbed more angular momentum. There is, however, a third player in this angular momentum exchange game, and that is gas. We will discuss the role of each of the three players in this game (stellar component in the bar region, dark matter halo and gas) and what the resulting evolution can be. We will also discuss the effect that a halo triaxiality, such as found in cosmological simulations, can have on the evolution of the disc galaxy and its components. |
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vendredi 16 mars 2012 - 11:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |