Cavities, shocks and a cold front around 3C 320
  We present results obtained from the analysis of a total of 110 ks Chandra
observations of 3C 320 FR II radio galaxy, located at the centre of a cluster
of galaxies at a redshift $z=0.342$. A pair of X-ray cavities have been
detected at an average distance of $\sim$38 kpc along the East and West
directions with the cavity energy, age and total power equal to
$\sim$7.7$\times$10$^{59}$ erg, $\sim$7$\times$10$^7$ yr and
$\sim$3.5$\times$10$^{44}$ erg s$^{-1}$, respectively. The cooling luminosity
within the cooling radius of $\sim$100 kpc was found to be $L_{cool}
\sim8.5\times10^{43}$ erg s$^{-1}$. Comparison of these two estimates implies
that the cavity power is sufficiently high to balance the radiative loss. A
pair of weak shocks have also been evidenced at distances of $\sim$47 kpc and
$\sim$76 kpc surrounding the radio bubbles. Using the observed density jumps of
$\sim$1.8 and $\sim$2.1 at shock locations along the East and West directions,
we estimate the Mach numbers ($\mathcal{M}$) to be $\sim$1.6 and $\sim$1.8,
respectively. A sharp surface brightness edge was also detected at relatively
larger radius ($\sim$80 kpc) along the South direction. Density jump at this
surface brightness edge was estimated to be $\sim$1.6 and is probably due to
the presence of a cold front in this cluster. The far-infrared luminosity
yielded the star formation rate of 51 M$_{\odot}$ yr$^{-1}$ and is 1/4$^{th}$
of the cooling rate ($\dot{M}$ $\sim$ 192 M$_{\odot}$ yr$^{-1}$).
