Structured jets and VHE emission of blazars and radiogalaxies
F. Tavecchio, G. Ghisellini
TL;DR
This paper explores how structured jets with a fast spine and slower layer can explain the complex TeV emission and rapid variability observed in blazars and radiogalaxies, challenging simpler models.
Contribution
It introduces a model of radial jet structure with a spine and layer to account for observed high-energy phenomena in blazars and radiogalaxies.
Findings
Structured jets can explain rapid TeV variability.
Radial jet structure accounts for observed emission features.
Model aligns with recent TeV observations.
Abstract
Recent observations in the TeV band challenge the simplest models developed to describe the overall emission of blazars and radiogalaxies. In particular, the observation of variable TeV emission from M87 and the fast variability shown by PKS 2155-304 challenge the standard framework. We discuss how the existence of a radial structure in the sub-pc scale jet, with faster a component ("spine" or "needles") embedded in a slower layer can explain the basic phenomenology of these sources.
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