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Session: Cosmology and Relativistic Astrophysics

Name: Mr. Andreas Vitsos (University of Patras)
Coauthors: No coauthors were included.
Type: Poster
Title: Dynamical friction due to fuzzy dark matter on non-spherically symmetric satellites
Abstract:

Fuzzy dark matter is a plausible dark matter candidate in the form of an ultralight bosonic particle, whose mass-energy is ∼ 10^(-22) eV and its corresponding de Broglie wavelength is of kiloparsec scale. Fuzzy dark matter exhibits wave behaviour in scales comparable to a galactic core, which could not appear in conventional cold dark matter models. The presence of fuzzy dark matter in galactic clusters will impact the motion of their members through dynamical friction. In this work, we present simulations of the dynamical friction on satellites traversing an initially uniform fuzzy dark matter halo. We focus on the satellites whose shapes are beyond spherical symmetry described by ellipsoidal and logarithmic potentials. The wakes created on the fuzzy dark matter halo due to the passage of such satellites are qualitatively different from those generated by spherically symmetric ones. Furthermore, we find that the same satellite may experience a drag differing by a factor of 5 depending on its ellipticity and the direction of motion. Finally, we find that the dynamical friction time-scale is close to Hubble time, assuming a satellite of 10^11 M⊙ traversing at 10^3 km/s a FDM halo whose mean density is ∼ 10^6 M⊙ kpc^(-3).