星系团散射中微子通量对活动星系核重子加载效率的约束

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Pub Date : 2023-11-01 DOI:10.3847/1538-4357/acfa79
Xin-Yue Shi, Ruo-Yu Liu, Chong Ge, Xiang-Yu Wang
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引用次数: 0

摘要

活动星系核(agn)被广泛认为是超高能宇宙射线(CRs)最有希望的加速点之一。本质上,agn是由落入超大质量黑洞的物质的引力能提供动力的。然而,用重子装载因子η p来定义agn中CRs的引力到动能的转换效率尚不清楚。经过加速后,高能cr可以逃离宿主星系,进入星系团内介质(ICM)。这些CRs可以被限制在星系团内,并通过与ICM的质子-质子碰撞产生γ射线和中微子。本文研究了cr在星系团中的扩散,并计算了星系团总体的扩散中微子通量。利用冰立方中微子天文台给出的星系团累积未解析TeV-PeV中微子通量的最新上限,我们推导出星系团总体的平均重子负荷因子的上限为η p,重力> 2 × 10−3−0.1。这个约束比从后发星团的γ射线观测得到的约束更为严格。
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Constraining Baryon Loading Efficiency of Active Galactic Nuclei with Diffuse Neutrino Flux from Galaxy Clusters
Abstract Active galactic nuclei (AGNs) are widely believed to be one of the promising acceleration sites of ultrahigh-energy cosmic rays (CRs). Essentially, AGNs are powered by the gravitational energy of matter falling into supermassive black holes. However, the conversion efficiency of gravitational to kinetic energy of CRs in AGNs, which is defined as the baryon loading factor η p , is not well known yet. After being accelerated, high-energy CRs could escape the host galaxy and enter the intracluster medium (ICM). These CRs can be confined within the galaxy cluster and produce γ -rays and neutrinos through proton–proton collisions with the ICM. In this paper, we study the diffusion of CRs in galaxy clusters and calculate the diffuse neutrino flux from the galaxy cluster population. Using the latest upper limits on the cumulative unresolved TeV–PeV neutrino flux from galaxy clusters posed by the IceCube Neutrino Observatory, we derive the upper limit of the average baryon loading factor as η p ,grav ≲ 2 × 10 −3 − 0.1 for the population of galaxy clusters. This constraint is more stringent than the one obtained from γ -ray observation on the Coma cluster.
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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