Giant radio galaxies via inverse Compton weakened jets
Giant radio galaxies via inverse Compton weakened jets
复制标题
通过逆康普顿弱喷流形成的巨型射电星系
DOI：
10.1007/bfb0036027
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发表时间：
1989
影响因子：
6.5
通讯作者：
L. Saripalli
中科院分区：
文献类型：
--
作者：
P. Wiita;A. Rosen;Gopal;L. Saripalli
分析和数值模型的传播相对论喷流通过热星际介质（ISM），并进入一个更热的星系际介质（IGM）已被认为是。早期的工作使我们能够解释：双射电源当前的平均线性尺寸（350 kpc）;线性尺寸随着宇宙学红移z的减小;以及线性尺寸随着无线电功率的增加（在固定z处）。我们现在已经扩展了我们的模型，以考虑到本质上非常强大的喷流，这些喷流可能会在星际介质中以相对论方式开始前进。最终，波瓣中的能量密度变得与微波背景的能量密度相当，并且同步加速器发射电子对背景光子的逆康普顿损失变得重要。我们认为，只有强大的无线电引擎负责巨型射电星系（GRG，那些线性大小超过1.5 Mpc），我们也可以解释大多数观察到的特点的GRG，如它们的稀有性，适度的无线电通量和相对较强的无线电核心。
Both analytical and numerical models for the propagation of relativistic jets through a hot interstellar medium (ISM) and into an even hotter intergalactic medium (IGM) have been considered. Earlier work allowed us to explain: the current mean linear-size of double radio sources (∼350 kpc); the decrease in linear-size with cosmological redshift, z; and, the increase in linear-size with radio power (at fixed z). We now have extended our models to allow for intrinsically extremely powerful jets, which may start off advancing relativistically through the interstellar medium. Eventually the energy density in the lobes becomes comparable to that of the microwave background, and inverse Compton losses of the synchrotron emitting electrons against the background photons become important. We argue that only powerful radio engines are responsible for giant radio galaxies (GRGs, those whose linear size exceeds 1.5 Mpc) and we can also explain most of the observed peculiarities of the GRGs, such as their rarity, moderate radio flux and relatively strong radio cores.