Cosmic neutrinos provide a unique window into the otherwise hidden mechanism of particle acceleration in astrophysical objects. The IceCube Collaboration recently reported the likely association of one high-energy neutrino with a flare from the relativistic jet of an active galaxy pointed towards the Earth. However a combined analysis of many similar active galaxies revealed no excess from the broader population, leaving the vast majority of the cosmic neutrino flux unexplained. Here we present the likely association of a radio-emitting tidal disruption event, AT2019dsg, with a second high-energy neutrino. AT2019dsg was identified as part of our systematic search for optical counterparts to high-energy neutrinos with the Zwicky Transient Facility. The probability of finding any coincident radio-emitting tidal disruption event by chance is 0.5%, while the probability of finding one as bright in bolometric energy flux as AT2019dsg is 0.2%. Our electromagnetic observations can be explained through a multizone model, with radio analysis revealing a central engine, embedded in a UV photosphere, that powers an extended synchrotron-emitting outflow. This provides an ideal site for petaelectronvolt neutrino production. Assuming that the association is genuine, our observations suggest that tidal disruption events with mildly relativistic outflows contribute to the cosmic neutrino flux.

宇宙中微子为了解天体物理物体中原本隐藏的粒子加速机制提供了一个独特的窗口。IceCube 合作组织最近报道了一个高能中微子可能与指向地球的活跃星系的相对论射流的耀斑有关。然而，对许多类似的活跃星系的综合分析表明，更广泛的星系群并没有过剩，这使得绝大多数宇宙中微子通量无法解释。在这里，我们展示了无线电发射潮汐破坏事件 AT2019dsg 与第二个高能中微子的可能关联。AT2019dsg 被确定为我们使用 Zwicky 瞬变设施系统搜索高能中微子光学对应物的一部分。偶然发现任何同时发生的无线电发射潮汐中断事件的概率为 0.5%，而找到与 AT2019dsg 一样明亮的辐射热能通量的概率为 0.2%。我们的电磁观测可以通过多区模型来解释，无线电分析揭示了一个中央引擎，嵌入在紫外线光球中，为扩展的同步加速器发射外流提供动力。这为产生拍电子伏中微子提供了理想场所。假设这种关联是真实的，我们的观察表明，具有温和相对论流出的潮汐破坏事件有助于宇宙中微子通量。这为产生拍电子伏中微子提供了理想场所。假设这种关联是真实的，我们的观察表明，具有温和相对论流出的潮汐破坏事件有助于宇宙中微子通量。这为产生拍电子伏中微子提供了理想场所。假设这种关联是真实的，我们的观察表明，具有温和相对论流出的潮汐破坏事件有助于宇宙中微子通量。