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Time Scales and Tidal Effects in Minor Mergers

Chinese Journal of Astronomy and Astrophysics 2003年第5期3卷 395-409页

作者： Yu Lu and Jian-Yan WeiNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 luyu National Astronomical Observatories Chinese Academy of Sciences

We use controlled N-body simulation to investigate the dynamical processes(dynamical friction, tidal truncation, etc.) involved in the merging of small satellites into biggerhalos. We confirm the validity of some analytic formulae proposed earlier based on simplearguments. For rigid satellites represented by softened point masses, the merging time scale dependson both the orbital shape and concentration of the satellite. The dependence on orbital ellipticityis roughly a power law, as suggested by Lacey & Cole, and the dependence on satellite concentrationis similar to that proposed by White. When merging satellites are represented by non-rigid objects,Tidal effects must be considered. We found that material beyond the tidal radius are stripped *** decrease in the satellite mass might mean an increase in the merging time scale, but in fact,the merging time is decreased, because the stripped-off material carries away a proportionatelylarger amount of of orbital energy and angular momentum.

关键词： cosmology: dark matter galaxies: kinematics and dynamics galaxies:structure galaxies: interactions numerical methods

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A Study of Warm dark matter, the Missing Satellites Problem, and the UV Luminosity Cut-Off

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International Journal of Astronomy and Astrophysics 2023年第1期13卷 25-38页

作者： Bruce Hoeneisen Universidad San Francisco de Quito Quito Ecuador

In the warm dark matter scenario, the Press-Schechter formalism is valid only for galaxy masses greater than the “velocity dispersion cut-off”. In this work we extend the predictions to masses below the velocity dispersion cut-off, and thereby address the “Missing Satellites Problem” of the cold dark matter ΛCDM scenario, and the rest-frame ultra-violet luminosity cut-off required to not exceed the measured reionization optical depth. For warm dark matter we find agreement between predictions and observations of these two phenomena. As a by-product, we obtain the empirical Tully-Fisher relation from first principles.

关键词： cosmology: dark matter Galaxies: Statistics

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