• X-ray Radiation Mechanisms and the Beaming Effect of Hot Spots and Knots in AGN Jets

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      https://www.ias.ac.in/article/fulltext/joaa/032/01-02/0193-0196

    • Keywords

       

      Galaxies: jets; magnetic fields; radiation mechanisms: non-thermal; X-rays: galaxies.

    • Abstract

       

      The observed broadband spectral energy distributions (SEDs) of 22 hot spots and 45 knots are modelled with single-zone lepton models. Considering the sources at rest, the X-rays of some hot spots can be explained by the SSC model with magnetic field being consistent with the equipartition magnetic field in magnitude of order 1, but at the same time an unreasonably low magnetic field is required to model the X-rays for all knots. When considering the relativistic bulk motion of the sources, the IC/CMB model well explains the X-ray emission for most of them under the equipartition condition. We show that the ratio of observational luminosity 𝑅𝐿 is tentatively correlated with the co-moving equipartition magnetic field 𝐵'eq and the beaming factor 𝛿. These facts suggest that the observational differences of the X-rays from the knots and hot spots may be mainly due to the differences in the Doppler boosting effect and the co-moving magnetic field of the two kinds of source.

    • Author Affiliations

       

      Jin Zhang1 Jin-Ming Bai2 Liang Chen2 Enwei Liang3

      1. College of Physics and Electronic Engineering, Guangxi Teachers Education University, Nanning 530001, China.
      2. National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, China.
      3. Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China.
    • Dates

       
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