Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..505s&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 505 - 506
Astronomy and Astrophysics
Astrophysics
Bl Lacertae Objects: X-Ray Spectra
Scientific paper
X-ray observations of BL Lac objects have revealed a complex relationship between spectral slope and flux over a variety of epochs. On extended timescales (>1 week) there is often a strong positive correlation between spectral hardness and flux. On shorter timescales, however, detailed well-sampled light curves of some objects have shown a range of behaviour from a strong negative correlation, weak or no correlation to a strong positive correlation. The authors show that such behaviour arises naturally from an inhomogeneous jet model which has time-dependent electron and magnetic field density perturbations.
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