Effects of chaoticity on the detectability of stellar streams

CLAUDIO LLINARES; MARTÍN MESTRE; DANIEL D. CARPINTERO

Córdoba

Conferencia; Friends of Friends Meeting 2019; 2019

IATE, OAC

Stellar streams with a dwarf galaxy progenitor happen frequently in the Universe according to observationsand in agreement with the current cosmological paradigm that predicts a hierarchical growth of structuresin the Universe. Another theoretical prediction is that dark matter halos have triaxial density distributions.Triaxial potentials have the phase?space divided in regular and chaotic orbits and it could happen that theformation and evolution of a stellar stream be related to the level of chaoticity of the orbit of its progenitor.We perform N-body numerical simulations in order to measure the effect of chaos on the detectability ofstellar streams, applying a simple criterium on the velocity distribution of the stellar stream particles. Wefind a correlation between chaos and the length of a temporal window of detectability, as long as the errorof the velocity distribution of the background stellar halo is not greater than one percent.