Resolving Doppler-factor crisis in AGNs: non-steady magnetized outflows

TL;DR

This paper proposes that non-stationary, magnetized jet acceleration in AGNs leads to faster-moving jet edges that explain high-energy emissions, aligning well with recent gamma-ray and radio observations.

Contribution

It introduces a model where non-steady magnetized outflows produce higher Lorentz factors at jet edges, resolving the Doppler-factor crisis in AGNs.

Findings

Model predicts higher Lorentz factors at jet edges due to non-stationary acceleration.

Favorable comparison with Fermi gamma-ray and MOJAVE radio VLBI data.

Explains high-energy emission dominance by faster jet components.

Abstract

Magnetically-driven non-stationary acceleration of jets in AGNs results in the leading parts of the flow been accelerated to much higher Lorentz factors than in the case of steady state acceleration with the same parameters. The higher Doppler-boosted parts of the flow may dominate the high energy emission of blazar jets. We suggest that highly variable GeV and TeV emission in blazars is produced by the faster moving leading edges of highly magnetized non-stationary ejection blobs, while the radio data trace the slower-moving bulk flow. Model predictions compare favorably with the latest Fermi gamma-ray and MOJAVE radio VLBI results.