Large kinetic power in FRII radio jets |
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| Authors: | Hirotaka Ito Motoki Kino Nozomu Kawakatu Naoki Isobe Shoichi Yamada |
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| Institution: | (1) Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan;(2) ISAS/JAXA, 3-1-1 Yoshinodai, 229-8510 Sagamihara, Japan;(3) National Astronomical Observatory of Japan, 181-8588 Mitaka, Japan;(4) Cosmic Radiation Laboratory, Institute of Physical and Chemical Research, Wako, 351-0198 Saitama, Japan;(5) Advanced Research Institute for Science & Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan |
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| Abstract: | We investigate the total kinetic powers (L
j) and ages (t
age) of powerful jets of four FR II radio sources (Cygnus A, 3C 223, 3C 284, and 3C 219) by the detail comparison of the dynamical
model of expanding cocoons with observed ones. It is found that these sources have quite large kinetic powers with the ratio
of L
j to the Eddington luminosity (L
Edd) resides in 0.02<L
j/L
Edd<10. Reflecting the large kinetic powers, we also find that the total energy stored in the cocoon (E
c) exceed the energy derived from the minimum energy condition (E
min ): 2<E
c/E
min <160. This implies that a large amount of kinetic power is carried by invisible components such as thermal leptons (electron
and positron) and/or protons. |
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| Keywords: | Radio galaxies: individual (Cygnus A 3C 223 3C 284 3C 219) |
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