逆康普顿鬼HDF 130和巨射电星系6C 0905+3955：双射电源演化的解析模型匹配
The inverse-Compton ghost HDF 130 and the giant radio galaxy 6C 0905+3955: matching an analytic model for double radio source evolution
摘要：
我们提出了HDF 130的新GMRT观测，HDF 130是一个巨大射电源的逆康普顿（IC）鬼，不再由喷气机提供动力。我们比较HDF 130的属性与新的和重要的约束的上限的无线电通量密度在240 MHz的分析模型。我们学习什么样的物理参数的值在模型中的动力学和演化的射电光度和X射线光度（由于IC散射的宇宙微波背景（CMB））的Fanaroff-莱利II（FR II）源能够描述一个源的功能（瓣长，轴比，X射线光度，光子指数和上限的射电光度）类似的观察。HDF 130被发现同意这样的解释，即它是一个强大的双叶射电源的IC鬼，我们在喷流活动（持续了5- 1亿年）停止后至少观察了几百万年。从热点注入到叶中的粒子的最小洛伦兹因子优选为$γ\sim10^3$，以使模型很好地描述观察到的量，假设注入到叶中时的磁能密度密度、电子能量密度和叶压力根据最小能量自变量通过常数因子相关联，使得最小洛伦兹因子受到叶压力的约束。我们还应用该模型来匹配6 C 0905+3955的特征，6 C 0905 +3955是一个经典的双FR II星系，由于缺乏热点逆康普顿X射线发射，被认为在热点中具有低能量的$γ\sim10^4$截止。这些模型表明，6C 0905+3955热点的低能截止是$γ\gtrsim 10^3$，略高于X射线发射所需的粒子。
英文摘要：
We present new GMRT observations of HDF 130, an inverse-Compton (IC) ghost of a giant radio source that is no longer being powered by jets. We compare the properties of HDF 130 with the new and important constraint of the upper limit of the radio flux density at 240 MHz to an analytic model. We learn what values of physical parameters in the model for the dynamics and evolution of the radio luminosity and X-ray luminosity (due to IC scattering of the cosmic microwave background (CMB)) of a Fanaroff-Riley II (FR II) source are able to describe a source with features (lobe length, axial ratio, X-ray luminosity, photon index and upper limit of radio luminosity) similar to the observations. HDF 130 is found to agree with the interpretation that it is an IC ghost of a powerful double-lobed radio source, and we are observing it at least a few Myr after jet activity (which lasted 5--100 Myr) has ceased. The minimum Lorentz factor of injected particles into the lobes from the hotspot is preferred to be $γ\sim10^3$ for the model to describe the observed quantities well, assuming that the magnetic energy density, electron energy density, and lobe pressure at time of injection into the lobe are linked by constant factors according to a minimum energy argument, so that the minimum Lorentz factor is constrained by the lobe pressure. We also apply the model to match the features of 6C 0905+3955, a classical double FR II galaxy thought to have a low-energy cutoff of $γ\sim10^4$ in the hotspot due to a lack of hotspot inverse-Compton X-ray emission. The models suggest that the low-energy cutoff in the hotspots of 6C 0905+3955 is $γ\gtrsim 10^3$, just slightly above the particles required for X-ray emission.
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