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We report the \Suzaku/XIS and HXD and \Chandra/ACIS-I results on the X-rayspectra of the Phoenix cluster at the redshift $z=0.596$. The spectrum of theintracluster medium (ICM) is well-reproduced with the emissions from a lowtemperature ($\sim3.0$\,keV and $\sim0.76$\,solar) and a high temperature($\sim11$\,keV and $\sim0.33$\,solar) plasmas; the former is localized at thecluster core, while the latter distributes over the cluster. In addition tothese ICM emissions, a strongly absorbed power-law component is found, which isdue to an active galactic nucleus (AGN) in the cluster center. The absorptioncolumn density and unobscured luminosity of the AGN are$\sim3.2\times10^{23}$\,cm$^{-2}$ and $\sim4.7\times10^{45}$\,ergs\,s$^{-1}$(2-10\,keV), respectively. Furthermore, a neutral iron (\ion{Fe}{1}) K-shellline is discovered for the first time with the equivalent width (EW) of$\sim150$\,eV at the rest frame. The column density and the EW of the\ion{Fe}{1} line are exceptionally large for such a high luminosity AGN, andhence the AGN is classified as a type 2 quasi-stellar object (QSO). Wespeculate that the significant fraction of the ICM cooled gas would be consumedto maintain the torus and to activate the type 2 QSO. The Phoenix cluster has amassive starburst in the central galaxy, indicating suppression in the coolingflow is less effective. This may be because the onset of the latest AGNfeedback has occurred recently and it has not yet been effective.Alternatively, the AGN feedback is predominantly in radiative-mode not inkinetic-mode and the torus may work as a shield to reduce its effect.

Suzaku observations of the type 2 QSO in the central galaxy of the Phoenix cluster