• What Governs Lorentz Factors of Jet Components in Blazars?

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      https://www.ias.ac.in/article/fulltext/joaa/035/03/0357-0362

    • Keywords

       

      Black hole physics; accretion; galaxies: jets.

    • Abstract

       

      We use a sample of radio-loud Active Galactic Nuclei (AGNs) with measured black hole masses to explore the jet formation mechanisms in these sources. We find a significant correlation between black hole mass and the bulk Lorentz factor of the jet components for this sample, while no significant correlation is present between the bulk Lorentz factor and the Eddington ratio. Recent investigations suggested that the most super-massive black holes in elliptical galaxies have on average higher spins than the black holes in spiral galaxies. The correlation between black hole mass and bulk Lorentz factor of the jet components found in this work implies that the motion velocity of the jet components is probably governed by the black hole spin. The faster moving jets are magnetically accelerated by the magnetic fields threading the horizon of more rapidly rotating black holes.

    • Author Affiliations

       

      Xinwu Cao1 Bo Chai2 Ming Zhou3 Minfeng Gu1

      1. Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China.
      2. Polar Research Institute of China, 451 Jinqiao Road, Pudong, Shanghai 200136, China.
      3. Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China.
    • Dates

       
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