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首页> 外文期刊>The Astrophysical journal >DISCOVERY OF THE LOW-ENERGY CUTOFF IN A POWERFUL GIANT RADIO GALAXY
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DISCOVERY OF THE LOW-ENERGY CUTOFF IN A POWERFUL GIANT RADIO GALAXY

机译：强大的巨大无线电银河系中的低能截止点的发现

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The lobes of radio galaxies and quasars, fed by jets and hot spots, represent a significant, and currently ill-constrained, source of energy input into the intergalactic medium (IGM). How much energy is input into the IGM depends on the minimum energy to which the power-law distribution of relativistic particles is accelerated in the hot spots. This has hitherto been unknown to within 3 orders of magnitude. We present direct evidence for the discovery of this low-energy cutoff in the lobe of a megaparsec-sized radio galaxy via the existence of extended X-ray emission, inverse Compton-scattered from aged radio plasma, and its separation by 80 kpc from regions containing freshly accelerated plasma from the hot spot. The low-energy cutoff of ? ～ 10~4 in the hot spot is higher than previously thought but reconciles discrepancies with magnetic field estimates that had been systematically lower than equipartition values. The inverse Compton scattering of the spent synchrotron plasma is at the expense of cosmic microwave background (CMB) photons; we comment on the importance of such giant radio galaxies as contaminants of CMB anisotropies.
机译：由射流和热点提供的射电星系和类星体的波瓣代表了输入到星际间介质（IGM）的重要且目前受到限制的能量来源。向IGM输入多少能量取决于在热点中相对论粒子的幂律分布加速到的最小能量。迄今为止，这在3个数量级以内是未知的。我们提供了直接证据，证明了通过存在扩展的X射线发射，从老化的放射性等离子体中逆康普顿散射以及其与区域之间的间隔80 kpc的分离，在兆帕秒大小的射电星系的叶中发现了这种低能截止包含来自热点的新鲜加速血浆。 的低能量截止点？热点中的〜10〜4比以前认为的要高，但与系统地低于均分值的磁场估计值相符。用过的同步加速器等离子体的康普顿逆散射以宇宙微波背景（CMB）光子为代价。我们评论像CMB各向异性这样的巨大射电星系的重要性。

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