The High-Energy Continuum Emission of the Gamma-Ray Blazar PKS 0528+134

Details The High-Energy Continuum Emission of the Gamma-Ray Blazar PKS 0528+134 The High-Energy Continuum Emission of the Gamma-Ray Blazar PKS 0528+134

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474..639s&link_type=abstract

Astrophysical Journal v.474, p.639

Astronomy and Astrophysics

Astronomy

40

Galaxies: Active, Galaxies: Individual Alphanumeric: Pks 0528+134, Gamma Rays: Observations, Radiation Mechanisms: Nonthermal, X-Rays: Galaxies

Scientific paper

We present Advanced Satellite for Cosmology and Astrophysics (ASCA) observations of the gamma -ray blazar PKS 0528+134, obtained at two separate epochs in 1994 August and 1995 March. These data represent the first measurement of the X-ray continuum emission of this source in the medium-hard X-ray band. Both ASCA spectra are consistent with a single power law with photon index Gamma ~ 1.7--1.8 and column density NH ~ 5 x 1021 cm-2, higher than Galactic. The X-ray flux increased by a factor of 4 in ~7 months without appreciable change of the spectral shape. During the lower state of 1994 August, PKS 0528+134 was observed simultaneously in the optical, X-rays, and at gamma -ray energies with EGRET. The gamma -ray intensity is the faintest detected thus far in the source, with a steep spectrum ( Gamma ~ 2.7). The extrapolation of the X-ray continuum to the gamma -ray range requires a sharp spectral break at ~1022 Hz. We discuss the radio through gamma -ray spectral energy distribution of PKS 0528+134, comparing the low state of 1994 August with the flare state of 1993 March. We show that in PKS 0528+134, a nonnegligible contribution from the external radiation field is present and that, although synchrotron self-Compton scenarios cannot be ruled out, inverse Compton upscattering of thermal seed photons may be the dominant cooling process for the production of the high-energy continuum in this blazar.

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