Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf...97w&link_type=abstract
In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 97-102 (SEE N
Astronomy and Astrophysics
Astronomy
2
Bl Lacertae Objects, Light Curve, Radio Astronomy, X Ray Astronomy, Brightness, Cross Correlation, Light (Visible Radiation), Radiant Flux Density, Spectrum Analysis, Stellar Radiation, Variability
Scientific paper
Campaigns, carried out simultaneously in several frequency bands aimed at a densely sampled monitoring of the variability pattern of the BL Lac object 0716+714, are reported. The variations are closely correlated both in simultaneous radio optical as well as optical X-ray observations. The time lag between variations at different wavelengths is difficult to assess due to the quasi periodic nature of the variations but is likely to be smaller than a few days. The time lags and the statistically asymmetric light curves argue against the variations being caused by the microlensing effect. It is speculated that the emission process of the rapidly variable component is different from the classical SSC model, possibly due to coherent radiation mechanisms as caused by anisotropic electron distributions.
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