Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.389b&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
It has recently been shown that the synchrotron reflection scenario recently proposed to explain gamma-ray flares in blazars is unlikely to be efficient in the case of uniform, spherically distributed, Thomson thin broad-line regions surrounding the active nucleus. In this paper, we therefore analyze a more realistic situation, taking into account the effects of inhomogeneities (clumpiness) of the broad-line region clouds. We find that synchrotron rescattering off a relatively small, but Thomson-thick cloud in the BLR, located very close to the jet trajectory, can, for a short time, provide a very efficient source of soft photons for Compton scattering in the jet and lead to a gamma-ray flare with a very typical pattern of evolution of its broadband spectrum. Implications of this scenario for observations at all wavelengths are discussed, including the possibility of superluminal motion towards a stationary component. If the cloud is located directly within the jet trajectory, sweeping energizaztion, as the blob passes through the cloud, provides an efficient way of particle acceleration, possibly producing a different kind of gamma-ray flare. The characteristics of both types of flares are discussed and compared to observed blazar flares.
Böttcher Markus
Dermer Carles D.
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