Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-25
Mon.Not.Roy.Astron.Soc.364:659-664,2005
Astronomy and Astrophysics
Astrophysics
6 pages, 4 figures; MNRAS accepted, final version
Scientific paper
10.1111/j.1365-2966.2005.09580.x
We examine the constraints imposed on the total kinetic power ($L_{\rm j}$) and the age ($t_{\rm age}$) of relativistic jets in FR II radio sources in a new way. We solve the dynamical expansion of its cocoon embedded in the intra-cluster medium (ICM) and obtain the analytic solution of its physical quantities in terms of $L_{\rm j}$ and $t_{\rm age}$. The estimate of $L_{\rm j}$ and $t_{\rm age}$ is done by the comparison of the model and the observed shape of the cocoon. The analysis is focused on Cygnus A and we find that (i) the source age is $3 {\rm Myr}
Kawakatu Nozomu
Kino Motoki
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