Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-28
AIP Conf.Proc.804:333-340,2006
Astronomy and Astrophysics
Astrophysics
8 pages, 8 figures. Invited review to the Conference on Planetary Nebulae as Astronomical Tools (Gdansk, Poland, 28 June-2 Jul
Scientific paper
10.1063/1.2146306
From this vast subject, I will pick out and review three specific topics, namely the formation and evolution of bars, the formation of bulges, and the evolution during multiple major mergers. Bars form naturally in galactic discs. Their evolution is driven by the exchange of angular momentum within the galaxy. This is emitted mainly by near-resonant material in the inner disc (bar), and is absorbed by near-resonant material in the outer disc and in the halo. As a result of this, the bar becomes stronger and rotates slower. Bulges are not a homogeneous class of objects. Based on their formation history, one can distinguish three types. Classical bulges are mainly formed before the actual disc component, from collapses or mergers and the corresponding dissipative processes. Boxy/peanut bulges are parts of bars seen edge-on. Finally, disc-like bulges are formed by the inflow of material to the center due to bar torques. Major mergers bring strong and fast evolution and can turn discs into ellipticals. I present results from simulations of multiple mergers in groups of disc or of elliptical galaxies and discuss the orbital anisotropy in the merger remnant.
No associations
LandOfFree
Formation and dynamical evolution of galaxies and of their components does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Formation and dynamical evolution of galaxies and of their components, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formation and dynamical evolution of galaxies and of their components will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-500011