Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 393, Issue 3, Pages 1063-1069Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.14270.x
Keywords
acceleration of particles; galaxies: active; BL Lacertae objects: general; galaxies: jets
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Funding
- Science Foundation [05/RFP/PHY0055]
- Science Foundation Ireland (SFI) [05/RFP/PHY0055] Funding Source: Science Foundation Ireland (SFI)
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Observations of minute-scale flares in TeV Blazars place constraints on particle-acceleration mechanisms in those objects. The implications for a variety of radiation mechanisms have been addressed in the literature; in this paper, we compare four different acceleration mechanisms: diffusive shock acceleration, second-order Fermi, shear acceleration and the converter mechanism. When the acceleration time-scales and radiative losses are taken into account, we can exclude shear acceleration and the neutron-based converted mechanism as possible acceleration processes in these systems. The first-order Fermi process and the converter mechanism working via synchrotron self-Compton (SSC) photons are still practically instantaneous, however, provided sufficient turbulence is generated on the time-scale of seconds. We propose stochastic acceleration as a promising candidate for the energy-dependent time delays in recent gamma-ray flares of Markarian 501.
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