Deep Chandra Observations of the Extended Gas Sloshing Spiral in A2029
  Recent X-ray observations of galaxy clusters have shown that there is
substructure present in the intracluster medium (ICM), even in clusters that
are seemingly relaxed. This substructure is sometimes a result of sloshing of
the ICM, which occurs in cool core clusters that have been disturbed by an
off-axis merger with a sub-cluster or group. We present deep Chandra
observations of the cool core cluster Abell 2029, which has a sloshing spiral
extending radially outward from the center of the cluster to approximately 400
kpc at its fullest extent---the largest continuous spiral observed to date. We
find a surface brightness excess, a temperature decrement, a density
enhancement, an elemental abundance enhancement, and a smooth pressure profile
in the area of the spiral. The sloshing gas seems to be interacting with the
southern lobe of the central radio galaxy, causing it to bend and giving the
radio source a wide-angle tail (WAT) morphology. This shows that WATs can be
produced in clusters that are relatively relaxed on large scales. We explore
the interaction between heating and cooling in the central region of the
cluster. Energy injection from the active galactic nucleus (AGN) is likely
insufficient to offset the cooling, and sloshing may be an important additional
mechanism in preventing large amounts of gas from cooling to very low
temperatures.
