Cavities, shocks and a cold front around 3C 320

Abstract

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 $L_{cool}\sim 8.5\times 10^{43}$ 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${}^{-1}$).

10 pages, 11 figures and 3 tables. Accepted for publication in MNRAS

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