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arXiv 2005.05340astro-ph.HE
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与高能中微子同时发生的潮汐破裂事件

A tidal disruption event coincident with a high-energy neutrino

Robert Stein, Sjoert van Velzen, Marek Kowalski, Anna Franckowiak, Suvi Gezari, James C. A. Miller-Jones, Sara Frederick, Itai Sfaradi, Michael F. Bietenholz, A… 展开作者

Robert Stein, Sjoert van Velzen, Marek Kowalski, Anna Franckowiak, Suvi Gezari, James C. A. Miller-Jones, Sara Frederick, Itai Sfaradi, Michael F. Bietenholz, Assaf Horesh, Rob Fender, Simone Garrappa, Tomás Ahumada, Igor Andreoni, Justin Belicki, Eric C. Bellm, Markus Böttcher, Valery Brinnel, Rick Burruss, S. Bradley Cenko, Michael W. Coughlin, Virginia Cunningham, Andrew Drake, Glennys R. Farrar, Michael Feeney, Ryan J. Foley, Avishay Gal-Yam, V. Zach Golkhou, Ariel Goobar, Matthew J. Graham, Erica Hammerstein, George Helou, Tiara Hung, Mansi M. Kasliwal, Charles D. Kilpatrick, Albert K. H. Kong, Thomas Kupfer, Russ R. Laher, Ashish A. Mahabal, Frank J. Masci, Jannis Necker, Jakob Nordin, Daniel A. Perley, Mickael Rigault, Simeon Reusch, Hector Rodriguez, César Rojas-Bravo, Ben Rusholme, David L. Shupe, Leo P. Singer, Jesper Sollerman, Maayane T. Soumagnac, Daniel Stern, Kirsty Taggart, Jakob van Santen, Charlotte Ward, Patrick Woudt, Yuhan Yao

摘要:

宇宙中微子提供了一个独特的窗口,否则隐藏在天体物理对象的粒子加速机制。2013年发现了一个高能中微子流,冰立方合作组织最近报告说,一个高能中微子可能与一个指向地球的活动星系的相对论性喷流的耀斑有关。然而,对许多类似的活动星系的综合分析显示,更广泛的人口没有多余的,留下了宇宙中微子通量的绝大多数无法解释。在这里,我们提出了无线电发射潮汐破坏事件AT 2019 dsg与第二个高能中微子的可能联系。AT2019dsg被确定为我们用Zwicky瞬态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扰动事件的概率为0.5%,而发现一个像AT2019dsg一样明亮的热能量通量的概率为0.2%。我们的电磁观测可以通过一个多区域模型来解释,无线电分析揭示了一个嵌入在紫外光球中的中央引擎,它为扩展的同步辐射流出提供动力。这为PeV中微子的产生提供了一个理想的场所。假设这种关联是真实的,我们的观察表明,具有轻度相对论流出的潮汐破裂事件有助于宇宙中微子通量。

英文摘要:

Cosmic neutrinos provide a unique window into the otherwise-hidden mechanism of particle acceleration in astrophysical objects. A flux of high-energy neutrinos was discovered in 2013, and 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 multi-zone 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 PeV 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.

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