Gas Sloshing and Radio Galaxy Dynamics in the Core of the 3C449 Group
  We present results from a 140 ks Chandra/ACIS-S observation of the hot gas
around the canonical FR I radio galaxy 3C 449. An earlier, shorter 30 ks
Chandra observation of the group gas showed an unusual entropy distribution and
a surface brightness edge in the gas that could be a strong shock around the
inner radio lobes. In our deeper data we find no evidence for a temperature
increase inside of the brightness edge, but a temperature decrease across part
of the edge. This suggests that the edge is a "sloshing" cold front due to a
merger within the last ~1.3-1.6 Gyrs. Both the northern and the southern inner
jets are bent slightly to the west in projection as they enter their respective
lobes, suggesting that the sloshing core is moving to the east. The straight
inner jet flares at approximately the position where it crosses the contact
edge, suggesting that the jet is entraining and thermalizing some of the hot
gas as it crosses the edge. We also detect filaments of X-ray emission around
the southern inner radio jet and lobe which we attribute to low entropy
entrained gas. The lobe flaring and gas entrainment were originally predicted
in simulations of Loken et al. (1995) and are confirmed in our deep
observation.
