http://arxiv.org/abs/1511.08330
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 $\sim 4 ^{\prime}$ for the NW lobe and $\sim 1.2 ^{\prime}$ 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 $\delta=\Gamma$, while the minimum value of $\theta$ is not constrained due to the degeneracy existing with the value of Lorentz factor $\Gamma$. Given the photometric redshift $z \approx 0.3$, this GRG shows a core luminosity of $P_{1.4 GHz} \approx 5.52 \times 10^{24}$ W Hz$^{-1}$, and a luminosity $P_{1.4 GHz} \approx 1.29 \times 10^{25}$ W Hz$^{-1}$ for the NW lobe and $P_{1.4 GHz} \approx 0.46 \times 10^{25}$ W Hz$^{-1}$ for the SE lobe, consistent with the typical GRG luminosities. The radio lobes show a fractional linear polarization $\approx 9 \%$ consistent with typical values found in other GRG lobes.
S. Colafrancesco, N. Mhlahlo, T. Jarrett, et. al.
Mon, 30 Nov 15
43/78
Comments: 7 pages, 6 figures, 2 tables, accepted for publication in MNRAS
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