Boundary Shear Acceleration in the Jet of MKN501 - Astrophysics > High Energy Astrophysical Phenomena

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Abstract: The high resolution image of the jet of the BL Lac object MKN501 in radio,show a limb-brightened feature. An explanation of this feature as an outcome ofdifferential Doppler boosting of jet spine and jet boundary due to transversevelocity structure of the jet requires large viewing angle. However thisinference contradicts with the constraints derived from the high energy$\gamma$-ray studies unless the jets bends over a large angle immediately afterthe $\gamma$-ray zone close to the central engine. In this letter we proposean alternate explanation to the limb-brightened feature of MKN501 byconsidering the diffusion of electrons accelerated at the boundary shear layerinto the jet medium and this consideration does not require large viewingangle. Also the observed difference in the spectral index at the jet boundaryand jet spine can be understood within the frame work of shear acceleration.

Autor: S. Sahayanathan

Fuente: https://arxiv.org/