منابع مشابه
Fitting orbits to tidal streams
Recent years have seen the discovery of many tidal streams through the Galaxy. Relatively straightforward observations of a stream allow one to deduce three phase-space coordinates of an orbit. An algorithm is presented that reconstructs the missing phasespace coordinates from these data. The reconstruction starts from assumed values of the Galactic potential and a distance to one point on the ...
متن کاملOn the Stability of Tidal Streams
We explore the stability of tidal streams to perturbations, motivated by recent claims that the clumpy structure of the stellar streams surrounding the globular cluster Palomar 5 are the result of gravitational instability. We calculate the Jeans length of tidal streams by treating them as a thin expanding cylinder of collisionless matter. We also find a general relation between the density and...
متن کاملTime evolution of gaps in tidal streams
We model the time evolution of gaps in tidal streams caused by collisions with dark matter subhalos, whose existence is predicted by the cold dark matter cosmological model. Detecting and analyzing these subhalos is therefore key to verifying this model. We develop a prescription to describe the evolution of a gap as the divergence of two nearby orbits in action-angle variables: one orbit on ea...
متن کاملUncovering CDM halo substructure with tidal streams
Models for the formation and growth of structure in a cold dark matter dominated universe predict that galaxy halos should contain significant substructure. Studies of the Milky Way, however, have yet to identify the expected few hundred sub-halos with masses greater than about 10 M⊙. Here we propose a test for the presence of sub-halos in the halos of galaxies. We show that the structure of th...
متن کاملModeling the elastic transmission of tidal stresses to great distances inland in channelized ice streams
suggest that ocean tidal stresses can perturb ice stream motion at distances about an order of magnitude farther inland than tidal flexure of the ice stream alone. Recent models exploring the role of tidal perturbations in basal shear stress are primarily two-dimensional, with the impact of the ice stream margins either ignored or parameterized. Here, we use twoand three-dimensional finite elem...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2014
ISSN: 1538-4357
DOI: 10.1088/0004-637x/795/1/95