The Broadband Energy Distribution of the Misaligned Gamma-Ray Blazar PKS 0521-365

Details The Broadband Energy Distribution of the Misaligned Gamma-Ray Blazar PKS 0521-365 The Broadband Energy Distribution of the Misaligned Gamma-Ray Blazar PKS 0521-365

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459..169p&link_type=abstract

Astrophysical Journal v.459, p.169

Astronomy and Astrophysics

Astronomy

24

Galaxies: Jets, Galaxies: Individual Alphanumeric: Pks 0521-365, Gamma Rays: Observations, Radiation Mechanisms: Nonthermal

Scientific paper

Simultaneous UV and X-ray observations of the blazar PKS 0521-365 are combined with radio, IR, optical, and y-ray data taken at different epochs to study the overall emission from 10 to 1023 Hz. The flux distribution declines from the IR to the UV range (alpha0pt uv = 1.4 + 0.1), but hardens at higher frequencies. The remarkably flat X-ray spectrum (energy index alphax = 0.68 + 0.12 in the range 0.2-7 keV) suggests a significant contribution by the inverse Compton process in this band. This is supported by the detection of the source in y-rays by the EGRET experiment. The full radio-to-y-ray energy distribution is discussed. Various arguments suggest that the jet is not closely aligned with the line of sight (0 300), implying that the observed radiation is weakly boosted. This allows a direct estimate of the importance of different sources of photons available for upscattering. We conclude that in this source the synchrotron photons are likely to be the seeds for the inverse Compton process.

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