AGN feedback in the FR II galaxy 3C 220.1

Abstract

We present results from a deep (174 ks) Chandra observation of the FR-II radio galaxy 3C 220.1, the central brightest cluster galaxy (BCG) of a $kT\sim$ 4 keV cluster at $z=0.61$. The temperature of the hot cluster medium drops from $\sim 5.9$ keV to $\sim 3.9$ keV at $\sim$ 35 kpc radius, while the temperature at smaller radii may be substantially lower. The central active galactic nucleus (AGN) outshines the whole cluster in X-rays, with a bolometric luminosity of $2.0\times 10^{46}$ erg s${}^{-1}$ ($\sim 10$% of the Eddington rate). The system shows a pair of potential X-ray cavities $\sim 35$ kpc east and west of the nucleus. The cavity power is estimated within the range of $1.0\times 10^{44}$ erg s${}^{-1}$ and $1.7\times 10^{45}$ erg s${}^{-1}$, from different methods. The X-ray enhancements in the radio lobes could be due to inverse Compton emission, with a total 2-10 keV luminosity of $\sim 8.0\times 10^{42}$ erg s${}^{-1}$. We compare 3C 220.1 with other cluster BCGs, including Cygnus A, as there are few BCGs in rich clusters hosting an FR-II galaxy. We also summarize the jet power of FR-II galaxies from different methods. The comparison suggests that the cavity power of FR-II galaxies likely under-estimates the jet power. The properties of 3C 220.1 suggest that it is at the transition stage from quasar-mode feedback to radio-mode feedback.

14 pages, 13 figures, MNRAS accepted

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