A hard medium survey with ASCA - IV. The radio-loud type 2 QSO AX J0843+2942

We discuss the X-ray, optical and radio properties of AX J0843+2942, a high luminosity Type 2 AGN found in the ASCA Hard Serendipitous Survey. The X-ray spectrum is best described by an absorbed power-law model with a photon index of $\Gamma = 1.72^{+0.3}_{-0.6}$ and intrinsic absorbing column density of $N_{\rm H} = 1.44^{+0.33}_{-0.52} \times 10^{23}$ cm -2 . The intrinsic luminosity in the 0.5-10 keV energy band is $\simeq$$3\times 10^{45}$ erg s -1 , well within the range of quasar luminosities. AX J0843+2942, positionally coincident with the core of a triple and strong ($S_{\rm 1.4~GHz} \sim 1$ Jy; $P_{\rm 1.4~GHz} \sim 9\times 10^{33}$ erg s -1  Hz -1 ) radio source, is spectroscopically identified with a Narrow Line object (intrinsic FWHM of all the permitted emission lines $\la$1200 km s -1 ) at $z=0.398$, having line features and ratios typical of Seyfert-2 like objects. The high X-ray luminosity, coupled with the high intrinsic absorption, the optical spectral properties and the radio power, allow us to propose AX J0843+2942 as a Radio-Loud “Type 2 QSO". A discussion of the SED of this object is presented here together with a comparison with the SED of Ultra Luminous Infrared Galaxies, other “Type 2 QSO" candidates from the literature, and “normal" Radio-Quiet and Radio-Loud QSOs.