منابع مشابه
The Bar-Halo Interaction in SB Galaxies
We describe fully self-consistent N-body experiments of barred galaxies with massive halos. A rotating bar is braked through dynamical friction with the halo, which occurs on a short time scale when the central density of the halo is high. On the other hand, friction is weak in a model with a central halo density low enough that the disk dominates the rotation curve in the inner parts; this mod...
متن کاملBar-halo Friction in Galaxies Ii: Metastability
It is well-established that strong bars rotating in dense halos generally slow down as they lose angular momentum to the halo through dynamical friction. Angular momentum exchanges between the bar and halo particles take place at resonances. While some particles gain and others lose, friction arises when there is an excess of gainers over losers. This imbalance results from the generally decrea...
متن کاملNew Results on Bar - Halo Interactions
In this paper I argue that, far from necessarily hindering bar formation in disc galaxies, inner haloes may stimulate it. This constitutes a new instability mechanism by which bars can grow. To show this I use a number of N-body simulations whose initial conditions have identical discs and more or less concentrated haloes. They show that the bar that grows in the more halo-dominated environment...
متن کاملBar-halo Friction in Galaxies Iii: Halo Density Changes
The dark matter halos of bright galaxies appear to have densities in their inner parts that are at least an order of magnitude lower than predicted from structure-formation simulations. This well-known difficulty for LCDM would be ameliorated if galaxy evolution could drive down the dark matter density in the inner halo. Here I present a study of the halo density reductions that result from tor...
متن کاملThe Bar–Halo Interaction–II. Secular evolution and the religion of N-body simulations
This paper explores resonance-driven secular evolution between a bar and dark-matter halo using N-body simulations. We make direct comparisons to our analytic theory (Weinberg & Katz 2005) to demonstrate the great difficulty that an N-body simulation has representing these dynamics for realistic astronomical interactions. In a darkmatter halo, the bar’s angular momentum is coupled to the centra...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2002
ISSN: 0004-637X,1538-4357
DOI: 10.1086/340784