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(-0.6)(+0.3) and intrinsic absorbing column density of N-H = 1.44(-0.52)(+0.33) x 10(23) cm(-2). The intrinsic luminosity in the 0.5-10 keV energy band is similar or equal to3 x 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-1.4 (GHz) similar to 1 Jy; P-1.4 (GHz) similar to 9 x 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 less than or similar to1200 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.