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arXiv 2203.01260astro-ph.HEastro-ph.GA
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来自星系团的弥散伽马射线流强

The Diffuse Gamma-Ray Flux from Clusters of Galaxies

Saqib Hussain, Rafael Alves Batista, Elisabete M. de Gouveia Dal Pino, Klaus Dolag

AI总结:

本研究结合宇宙学磁流体动力学模拟与宇宙线蒙特卡洛传播模拟,发现星系团的积分伽马射线流强可贡献100 GeV以上全部弥散伽马射线背景,并预测相关地面实验有望探测到星系团的高能伽马射线。

摘要:

弥散伽马射线背景(DGRB)是指从观测到的伽马射线天图中扣除所有分立源后剩余的辐射,其起源目前尚不明确。DGRB可能包含来自不同源族的贡献,例如恒星形成星系、星暴星系、活动星系核、伽马射线暴或星系团。在本研究中,我们将星系团的宇宙学磁流体动力学模拟与利用蒙特卡洛模拟开展的宇宙线(CRs)传播过程相结合,研究红移范围为$z\leq 5.0$,结果表明:对于谱指数为$α= 1.5 - 2.5$、能量截断为$E_{\text{max}} = 10^{16} - 10^{17}$ eV的宇宙线,星系团的积分伽马射线流强对费米大面积望远镜(Fermi-LAT)观测到的100 GeV以上DGRB流强的贡献占比最高可达$100\\%$。该流强主要由质量满足$10^{13} \lesssim M/M_{\odot} \lesssim 10^{15}$、红移满足$ z \lesssim 0.3$的星系团贡献。我们的结果还预测,高海拔水切伦科夫探测器(HAWC)、大型高海拔空气簇射观测站(LHAASO)以及即将建成的切伦科夫望远镜阵列(CTA)等实验装置有望观测到来自星系团的高能伽马射线。

英文摘要:

The origin of the diffuse gamma-ray background (DGRB), the one that remains after subtracting all individual sources from observed gamma-ray sky, is unknown. The DGRB possibly encompasses contributions from different source populations such as star-forming galaxies, starburst galaxies, active galactic nuclei, gamma-ray bursts, or galaxy clusters. Here, we combine cosmological magnetohydrodynamical simulations of clusters of galaxies with the propagation of cosmic rays (CRs) using Monte Carlo simulations, in the redshift range $z\leq 5.0$, and show that the integrated gamma-ray flux from clusters can contribute up to $100\%$ of the DGRB flux observed by Fermi-LAT above $100$ GeV, for CRs spectral indices $α= 1.5 - 2.5$ and energy cutoffs $E_{\text{max}} = 10^{16} - 10^{17}$ eV. The flux is dominated by clusters with masses $10^{13} \lesssim M/M_{\odot} \lesssim 10^{15}$ and redshift $ z \lesssim 0.3$. Our results also predict the potential observation of high-energy gamma rays from clusters by experiments like the High Altitude Water Cherenkov (HAWC), the Large High Altitude Air Shower Observatory (LHAASO), and potentially the upcoming Cherenkov Telescope Array (CTA).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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