A Gravitational Double Scattering Mechanism for Generating High Velocity Objects

摘要: We present a dynamical model describing how halo particles can receive significant energy kick from the merger between their own host and target halo. This is highly relevant for understanding growth of cosmological halos, could especially provide an explanation some high velocity objects. The we includes \emph{double scattering mechanism}, where particle given by undergoing two subsequent gravitational deflections during merger. first deflection potential halo, whereas second particle's original resultant arises because halos move relative to each other deflections. To our knowledge, this mechanism has never been characterized in context before. derive analytically total energy, which composed double release tidal fields, as function its position In case $1:10$ Hernquist estimate that presented mechanisms generate with $\sim 2$ times virial measured at sphere. motivates us suggest recently discovered globular cluster HVCG-1 \citep{2014ApJ...787L..11C} be explained head-on Finally, illustrate orbital evolution outside sphere solving equation motion expanding universe. find 'sweet spot' around scale factor $0.3-0.5$ ejecting into large orbits, easily reach beyond 5$ radii.