Located at the center of the Perseus cluster , 3C 84 is an extremely bright and nearby radio galaxy .
Because of the strong diffuse thermal emission from the cluster in X-rays , the detailed properties and the origin of a power-law component from the central active galactic nucleus ( AGN ) remains unclear in the source .
We report here the first NuSTAR observations of 3C 84 .
The source was observed for 24.2 and 32 ks on February 01 and 04 , 2018 , respectively . NuSTAR observations spectrally decompose the power-law AGN component above 10 keV .
The power-law component dominates the spectrum above 20 keV with a photon index \sim 1.9 and an energy flux F _ { 20 - 30 ~ { } keV } = 1.0 \times 10 ^ { -11 } erg cm ^ { -2 } s ^ { -1 } , corresponding to an isotropic luminosity , L _ { 20 - 30 ~ { } keV } = 7.4 \times 10 ^ { 42 } erg s ^ { -1 } .
We discuss possible emitting sites for the power-law component .
The expected thermal emission from the accretion disk is not hot enough to account for the hard X-rays detected from the source .
Similar X-ray and \gamma -ray photon indices and long-term flux variations , the absence of cutoff energy in the hard X-ray spectrum of the source , correlated hard X-ray flux and hardness ratio variations , and the similarity of optical-X-ray slope to blazar rather than Seyfert galaxies supports the hard X-ray power-law component originating from the jet .