X-ray spectral variability in BL Lacertae objects.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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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