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Detection of massive tidal tails around the globular cluster Pal 5 with SDSS commissioning data
M. Odenkirchen, E. K. Grebel, C. M. Rockosi +17
We report the discovery of two well-defined tidal tails emerging from the sparse remote globular cluster Palomar 5. These tails stretch out symmetrically to both sides of the clust…
Towards optimal softening in 3D N-body codes: I. Minimizing the force error
Walter Dehnen
In N-body simulations of collisionless stellar systems, the forces are softened to reduce the shot noise. Softening modifies gravity at r=|x-y| smaller than softening length epsilo…
A Very Fast and Momentum-Conserving Tree Code
Walter Dehnen
The tree code for the approximate evaluation of gravitational forces is extended and substantially accelerated by including mutual cell-cell interactions. These are computed by a T…
The Age of the Solar Neighbourhood
James Binney, Walter Dehnen, Gianpaolo Bertelli
High-quality Hipparcos data for a complete sample of nearly 12000 main-sequence and subgiant stars, together with Padua isochrones, are used to constrain the star-formation history…