A Multi-parameter Model for Radio Dichotomy of Active Galactic Nuclei and Jets |
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Authors: | YE Yong-Chun WANG Ding-Xiong ZUO Xue-Qin |
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Institution: | Department of Physics, Huazhong University of Science
and Technology, Wuhan 430074, China |
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Abstract: | Based on the coexistence of the Blandford-Znajek and
magnetic coupling processes in black hole (BH) accretion disc,
a multi-parameter model for jet powers and radio loudness of active
galactic nuclei (AGNs) is studied. It turns out that radio-loudness of AGNs
could be governed by five parameters: (i) the BH spin, (ii) a power-law index of the variation of the
magnetic field on the disc; (iii) a parameter determining the position of the inner edge of the disc, (iv)
the ratio of the pressure of the magnetic field on the horizon to
the ram pressure of the innermost parts of an accretion flow,
and (v) the ratio of the angular
velocity of the open field lines to that of the horizon. The observed
dichotomy between radio-loud and radio-quiet AGNs is well
interpreted by the effects of the above parameters. Furthermore, we discuss
the derivative of radio loudness of AGNs with respect to each parameter
separately. In addition, the effect of the screw instability on radio
loudness of AGNs is discussed. |
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Keywords: | accretion accretion disc black hole physics galaxies |
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