Orbit decay in encounters between anisotropic spherical galaxies of equal mass. (arXiv:2312.00263v1 [astro-ph.GA])
Orbit decay in encounters between anisotropic spherical galaxies of equal mass. (arXiv:2312.00263v1 [astro-ph.GA]) <a href="http://arxiv.org/find/astro-ph/1/au:+Saleh_L/0/1/0/all/0/1">Lucas Saleh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barnes_J/0/1/0/all/0/1">Joshua E. Barnes</a> We investigate the effect of radial anisotropy on the rate of orbit decay in parabolic encounters of identical spherical galaxies. Our galaxy models have Hernquist density profiles and Osipkov–Merritt velocity distributions. We find that radially anisotropic models merge in as little as half the time of their isotropic counterparts. Anisotropic models are more susceptible to tidal deformation; this accelerates the transfer of orbital angular momentum to internal degrees of freedom. Even during the initial approach, the anisotropic models become more distorted, and arrive at pericentreRead More →