Discovery of a suspected giant radio galaxy with the KAT-7 array

We detect a new suspected giant radio galaxy (GRG) discovered by KAT-7. The GRG core is identified with the WISE source J013313.50-130330.5, an extragalactic source based on its infrared colors and consistent with a misaligned AGN-type spectrum at $z\approx 0.3$. The multi-$\nu$ spectral energy distribution (SED) of the object associated to the GRG core shows a synchrotron peak at $\nu \approx {10}^{14}$ Hz consistent with the SED of a radio galaxy blazar-like core. The angular size of the lobes are $\sim 4^{\mathrm{\prime }}$ for the NW lobe and $\sim {1.2}^{\mathrm{\prime }}$ for the SE lobe, corresponding to projected linear distances of $\sim 1078$ kpc and $\sim 324$ kpc, respectively. The best-fit parameters for the SED of the GRG core and the value of jet boosting parameter $\delta =2$, indicate that the GRG jet has maximum inclination $\theta \approx 30$ deg with respect to the line of sight, a value obtained for $\delta =\mathrm{\Gamma }$, while the minimum value of $\theta$ is not constrained due to the degeneracy existing with the value of Lorentz factor $\mathrm{\Gamma }$. Given the photometric redshift $z\approx 0.3$, this GRG shows a core luminosity of $P_{1.4GHz}\approx 5.52\times {10}^{24}$ W Hz${}^{-1}$, and a luminosity $P_{1.4 GHz} \approx 1.29 \times 10^{25}$WHz$^{-1}$fortheNWlobeand$P_{1.4 GHz} \approx 0.46 \times 10^{25}$WHz$^{-1}$ for the SE lobe, consistent with the typical GRG luminosities. The radio lobes show a fractional linear polarization $\approx 9\mathrm{\%}$ consistent with typical values found in other GRG lobes.