Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..osf.c2007b&link_type=abstract
American Physical Society, Fall Meeting of the Ohio Section, October 17-18, 2003, Case Western Reserve University, Cleveland Ohi
Physics
Scientific paper
The active galaxy BL Lacertae has been the target of an extensive multiwavelength observing campaign in the second half of 2000. This campaign has revealed optical and X-ray short-term flux and spectral variability on time scales as short as 1.5 hr, and an extension of the synchrotron emission component from this object far into the X-ray regime, out to about 10 keV. In this talk, I am presenting first results of detailed modelling of the broadband spectra and spectral variability observed during this multiwavelength campaign. Specifically, a fully time-dependent leptonic jet radiation transfer code is used to reproduce spectra, light curves, and hardness-intensity correlations. It is found that the observational results seem to be consistent with the source variability being dominated by variations of the spectral index of ultrarelativistic electrons in the jet at the time of their injection and acceleration near the base of the jet.
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