Dynamical friction of radio galaxies in galaxy clusters - Astrophysics

Abstract: The distribution of luminous radio galaxies in galaxy clusters has beenobserved to be concentrated in the inner region. We consider the role ofdynamical friction of massive galaxies $M\sim 10^{12.5}$ M${\odot}$,assuming them to be hosts of luminous radio galaxies, and show that beginningwith a Navarro-Frenk-White density profile of a cluster of mass $M {cl}\sim10^{15}$ M${\odot}$ of concentration $c\sim 5$ and collapsing at $z\sim 1$,the density profile of radio galaxies evolve to a profile of concentration $c\sim 25$, as observed, in a time scale of $t\sim 3\hbox{-}5$ Gyr.

Author: Biman B. Nath Raman Research Institute, India

Source: https://arxiv.org/