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Session 90 - High Energy Phenomena in AGNs.
Oral session, Friday, January 09

[90.05] BeppoSAX Observations of 2 Jy Lobe-dominated Broad-line AGN

P. Padovani (ESA,STScI/II Univ. of Rome), R. Morganti (IRA, Italy), J. Siebert (MPE, Germany), A. Cimatti (Arcetri Obs., Italy), C. Tadhunter (Univ. of Sheffield, UK), F. Vagnetti (II Univ. of Rome, Italy)

We present new BeppoSAX LECS, MECS, and PDS observations of five lobe-dominated, broad-line active galactic nuclei selected from the 2 Jy sample of southern radio sources. These include three radio quasars and two broad-line radio galaxies. ROSAT PSPC data, available for all the objects, are also used to better constrain the spectral shape in the soft X-ray band. The collected data cover the 0.1 -- 10 keV energy range, reaching 40 keV for one source. Detailed spectral fitting shows that all sources have a flat hard X-ray spectrum with energy index \alpha_x \sim 0.75 in the 2 -- 10 keV energy range. This is a new result, which is at variance with the situation at lower energies where these sources exhibit steeper spectra. Spectral breaks \sim 0.5 at 1 -- 2 keV characterize the overall X-ray spectra of our objects. The flat, high-energy slope is very similar to that displayed by flat-spectrum/core-dominated quasars, which suggests that the same emission mechanism (most likely inverse Compton) produces the hard X-ray spectra in both classes. Contrary to the optical evidence for some of our sources, no absorption above the Galactic value is found in our sample. Finally, a (weak) thermal component is also present at low energies in the two broad-line radio galaxies included in our study.

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