Constraints on neutrino emission from nearby galaxies using the 2MASS redshift survey and IceCube
Constraints on neutrino emission from nearby galaxies using the 2MASS redshift survey and IceCube
复制标题
使用 2MASS 红移巡天和 IceCube 对附近星系中微子发射的限制
DOI：
10.1088/1475-7516/2020/07/042
复制
发表时间：
2020
影响因子：
6.4
通讯作者：
Ansseau, I.
中科院分区：
文献类型：
--
作者：
Aartsen, M.G.;Ackermann, M.;Adams, J.;Aguilar, J.A.;Ahlers, M.;Ahrens, M.;Alispach, C.;Andeen, K.;Anderson, T.;Ansseau, I.
IceCube中微子观测站是一个立方公里的仪器化冰川冰，埋藏在地理南极地表以下1.5公里至2.5公里处。它包含一个由 5160 个 PMT 组成的阵列，用于检测穿过探测器的带电粒子产生的切伦科夫辐射，并旨在从天体物理源中搜索中微子 [1]。天体物理中微子可以通过两种方式识别：通过在探测器内搜索具有相互作用顶点的中微子，或者通过将良好重建的贯穿事件的到达方向与天体物理源或相互关联起来[2, 3]。这两种类型的搜索都产生了令人信服的天体物理中微子探测结果。 IceCube 通过使用起始事件对天体物理中微子的扩散通量进行统计上显着的检测，迎来了中微子天文学的出现。最近，IceCube 使用更大的历史事件数据集报告了第一个高能中微子天体物理来源的证据 [7, 8]。然而，通过累积的 IceCube 数据集中的 5σ 检测发现单个中微子源仍然难以实现 [10]。在附近的宇宙中观察到了各向异性，其中有大型超星系团，例如超银河平面，形成了过于密集的区域。由于高能中微子通量的主要起源于银河系已被 IceCube 所排斥[11, 18]，本地宇宙成为下一个可能产生中微子的最近位置。 1 弥散中微子通量与局部宇宙之间的潜在联系可以通过基于似然的方法将中微子位置映射到天空中的天体物理物体或结构来揭示，该方法已在其他研究中使用[17]。
The IceCube Neutrino Observatory is a cubic-kilometer of instrumented glacial ice buried from 1.5 km to 2.5 km below the surface of the geographic South Pole. It contains an array of 5160 PMTs to detect the Cherenkov radiation from charged particles passing through the detector and is designed to search for neutrinos from astrophysical sources [1]. Astrophysical neutrinos can be identified in two ways: by searching for neutrinos with interaction vertices inside the detector, or by correlating the arrival directions of well-reconstructed throughgoing events with astrophysical sources or with each other [2, 3]. Both types of searches have produced compelling detections of astrophysical neutrinos. IceCube ushered in the advent of neutrino astronomy with the statistically significant detection of a diffuse flux of astrophysical neutrinos using starting events. More recently, IceCube reported evidence of the first astrophysical source of high-energy neutrinos [7, 8] using a larger dataset of throughgoing events. However, the discovery of individual neutrino sources via a 5σ detection in the accumulated IceCube dataset remains elusive [10]. Anisotropy is observed in the nearby universe with large superclusters, such as the supergalactic plane, creating overdense regions. Since a predominantly Galactic origin for the high-energy neutrino flux has been disfavoured by IceCube [11, 18], the local universe becomes the next nearest location for possible neutrino production. 1 A potential link between the diffuse neutrino flux and the local universe could be revealed by likelihood-based methods mapping neutrino locations to astrophysical objects or structures in the sky, which have been used in other studies [17].