BeppoSAX Observations of 2 Jy Lobe-dominated Broad-Line Sources. I. The Discovery of a Hard X-ray Component

Details BeppoSAX Observations of 2 Jy Lobe-dominated Broad-Line Sources. I. The Discovery of a Hard X-ray Component BeppoSAX Observations of 2 Jy Lobe-dominated Broad-Line Sources. I. The Discovery of a Hard X-ray Component

1999-01-11

arxiv.org/abs/astro-ph/9901129v1

Mon.Not.Roy.Astron.Soc.304:829,1999

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures. Monthly Notices of the Royal Astronomical Society, in press. Postscript file also available at http://i

Scientific paper

10.1046/j.1365-8711.1999.02371.x

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 energy range 0.1 - 10 keV, reaching ~ 50 keV for one source (Pictor A). The main result from the spectral fits is that all sources have a hard X-ray spectrum with energy index alpha_x ~ 0.75 in the 2 - 10 keV range. This is at variance with the situation at lower energies where these sources exhibit steeper spectra. Spectral breaks ~ 0.5 at 1 - 2 keV characterize in fact 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. 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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