2016MNRAS.456..512C

We detect a new suspected giant radio galaxy (GRG) discovered by KAT-7. The GRG core is identified with the Wide-field Infrared Survey Explorer source J013313.50-130330.5, an extragalactic source based on its infrared colours and consistent with a misaligned active galactic nuclei-type spectrum at z ~ 0.3. The multi-ν spectral energy distribution (SED) of the object associated with the GRG core shows a synchrotron peak at ν ~ 10¹⁴ Hz consistent with the SED of a radio galaxy blazar-like core. The angular size of the lobes are ∼ 4arcmin for the NW lobe and ∼ 1.2arcmin for the SE lobe, corresponding to projected linear distances of ∼ 10⁷⁸ kpc and ∼ 324 kpc, respectively. The best-fitting parameters for the SED of the GRG core and the value of jet boosting parameter δ = 2, indicate that the GRG jet has maximum inclination θ ~ 30 deg with respect to the line of sight, a value obtained for δ = Γ, while the minimum value of θ is not constrained due to the degeneracy existing with the value of Lorentz factor Γ. Given the photometric redshift z ~ 0.3, this GRG shows a core luminosity of P1.4GHz ~ 5.52x10²⁴ W/ Hz, and a luminosity P1.4GHz ~ 1.29x10²⁵ W/ Hz for the NW lobe and P1.4GHz ~ 0.46x10²⁵ W/ Hz for the SE lobe, consistent with the typical GRG luminosities. The radio lobes show a fractional linear polarization ~9 percent consistent with typical values found in other GRG lobes.