The Hard X-Ray Spectra of Broad-Line Radio Galaxies as Observed With the Rossi X-Ray Timing Explorer

Details The Hard X-Ray Spectra of Broad-Line Radio Galaxies as Observed With the Rossi X-Ray Timing Explorer The Hard X-Ray Spectra of Broad-Line Radio Galaxies as Observed With the Rossi X-Ray Timing Explorer

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.3402e&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #34.02; Bulletin of the American Astronomical Society, Vol. 31, p.872

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the hard X-ray spectra of a sample of four broad-line radio galaxies observed with the Rossi X-Ray Timing Explorer, namely 3C 111, Pictor A, 3C 120, and 3C 382. The spectra are described by a power-law model with spectral indices in the range 1.6 to 1.8, which are lower than the typical values found in Seyfert galaxies. In the case of Pictor A and 3C 111 we detect weak Fe Kalpha emission lines (EW<=100 eV) which were not detected in earlier spectra obtained with ASCA. We also find that the power-law model provides a good description of the spectra up to high energies (20--30 keV). The Compton reflection hump, which is a hallmark of the X-ray spectra of Seyfert galaxies at these energies is either weak or undetectable in the broad-line radio galaxies of our small sample, with interesting upper limits. We argue that a plausible explanation for this observational result is a difference between the structure of the inner accretion disks of Seyfert galaxies and broad-line radio galaxies. This work was supported by NASA through grant NAG5-7733.

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