The innermost regions of accretion disks around black holes are strongly irradiated by X-rays that are emitted from a highly variable, compact corona, in the immediate vicinity of the black hole^1,2,3. The X-rays that are seen reflected from the disk⁴, and the time delays, as variations in the X-ray emission echo or ‘reverberate’ off the disk^5,6, provide a view of the environment just outside the event horizon. I Zwicky 1 (I Zw 1) is a nearby narrow-line Seyfert 1 galaxy^7,8. Previous studies of the reverberation of X-rays from its accretion disk revealed that the corona is composed of two components: an extended, slowly varying component extending over the surface of the inner accretion disk, and a collimated core, with luminosity fluctuations propagating upwards from its base, which dominates the more rapid variability^9,10. Here we report observations of X-ray flares emitted from around the supermassive black hole in I Zw 1. X-ray reflection from the accretion disk is detected through a relativistically broadened iron K line and Compton hump in the X-ray emission spectrum. Analysis of the X-ray flares reveals short flashes of photons consistent with the re-emergence of emission from behind the black hole. The energy shifts of these photons identify their origins from different parts of the disk^11,12. These are photons that reverberate off the far side of the disk, and are bent around the black hole and magnified by the strong gravitational field. Observing photons bent around the black hole confirms a key prediction of general relativity.

黑洞周围吸积盘的最内部区域受到 X 射线的强烈照射，这些 X 射线从紧邻黑洞^1,2,3的高度可变、致密的日冕中发出。从圆盘⁴反射的 X 射线和时间延迟，作为 X 射线发射回波的变化或在圆盘^5,6上“回响” ，提供了事件视界外的环境视图。I Zwicky 1 (I Zw 1) 是附近的窄线 Seyfert 1 星系^7,8. 先前对其吸积盘 X 射线回响的研究表明，日冕由两部分组成：一个扩展的、缓慢变化的部分，延伸到内部吸积盘的表面，以及一个准直的核心，光度波动从它的基础，支配着更快速的变异性^9,10. 在这里，我们报告了从 I Zw 1 中的超大质量黑洞周围发射的 X 射线耀斑的观测结果。通过 X 射线发射光谱中的相对论加宽的铁 K 线和康普顿驼峰检测到吸积盘的 X 射线反射。对 X 射线耀斑的分析揭示了光子的短暂闪光与从黑洞后面重新出现的发射相一致。这些光子的能量转移表明它们来自磁盘^11,12的不同部分。这些光子从圆盘的远端反射回来，在黑洞周围弯曲并被强大的引力场放大。观察围绕黑洞弯曲的光子证实了广义相对论的一个关键预测。