Dynamical friction and galaxy rotation - Should mergers lead to slow rotation?

Statistics – Applications

Scientific paper

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Angular Momentum, Coalescing, Friction Factor, Galactic Rotation, Dynamic Characteristics, Elliptical Galaxies, Halos, Spiral Galaxies

Scientific paper

The author discusses the evolution of the orbital angular momentum of a heavy particle that is subject to the dynamical friction force. It is shown that in this case evolution of its orbit will generally be such that its spin λ ≡ J|E|1/2/GM will increase. Particular stress is put on the importance of this result in determining the final spin of the merger remnant. It is shown that if the core radius of the merged halo is small the spin λ will increase as (initially) spiral galaxies sink to the centre to merge into a single unit and in this case it would be difficult to identify the merger remnant as a (slowly rotating) elliptical galaxy. On the other hand, if the core radius is large the spin will increase by a smaller amount. Applications of the results of this work to other astrophysical systems are also discussed.

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