The Estimate of Kinetic Power of Jets in FR II Radio Galaxies: Existence of Invisible Components?

The Estimate of Kinetic Power of Jets in FR II Radio Galaxies: Existence of Invisible Components?
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FR II 射电星系中喷流动能的估计:隐形成分的存在?

DOI:
10.1086/591036
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
S. Yamada
S. Yamada
中科院分区:
--
文献类型:
--
作者:
Hirotaka Ito;M. Kino;N. Kawakatu;N. Isobe;S. Yamada

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我们通过将膨胀茧的动力学模型与观测结果进行比较,研究了 FR II 射电星系中强大喷流的总动能 (Lj) 和年龄 (tage)。我们选择了四个 FR II 射电源(Cygnus A、3C 223、3C 284 和 3C 219),其簇内介质(ICM)的质量密度分布在文献中是已知的。研究发现,爱丁顿光度 (LEdd) 的大部分≳0.02-0.7 被作为射流的动能带走。对于某些来源,估计的 2Lj/LEdd 上限大于 1 (≲10),这表明存在超爱丁顿质量吸积的可能性。由于功率较大,我们还发现茧中存储的总能量 (Ec) 超过了辐射非热电子和磁场能量的最小能量条件 (Emin) 得出的能量:4 < Ec/Emin < 310。这意味着茧中的大部分能量是由热轻子(电子和正电子)和/或质子等不可见成分携带的。
We investigate the total kinetic power (Lj) and age (tage) of powerful jets in FR II radio galaxies by comparison of the dynamical model of expanding cocoons with observations. We select four FR II radio sources (Cygnus A, 3C 223, 3C 284, and 3C 219), for which the mass-density profiles of the intracluster medium (ICM) are known in the literature. It is found that large fractions ≳0.02-0.7 of the Eddington luminosity (LEdd) are carried away as kinetic power of jets. The upper limit of estimated 2Lj/LEdd is larger than unity (≲10) for some sources, suggesting the possibility of super-Eddington mass accretions. As a consequence of the large powers, we also find that the total energy stored in the cocoon (Ec) exceeds the energy derived from the minimum energy condition for the energy of radiating nonthermal electrons and magnetic fields (Emin): 4 < Ec/Emin < 310. This implies that most of the energy in the cocoon is carried by invisible components such as thermal leptons (electron and positron) and/or protons.
DOI: 10.1086/345085
发表时间: 2002-09
期刊: The Astrophysical Journal
影响因子: --
作者:
N. Kawakatu;M. Umemura;M. Mori
通讯作者: N. Kawakatu;M. Umemura;M. Mori
DOI: 10.1051/0004-6361:20031343
发表时间: 2003-08
影响因子: 6.5
作者:
Jun Kataoka;J. Leahy;P. G. Edwards;M. Kino;M. Kino;Fumio Takahara;Y. Serino;N. Kawai;
通讯作者: Jun Kataoka;J. Leahy;P. G. Edwards;M. Kino;M. Kino;Fumio Takahara;Y. Serino;N. Kawai;