Reconstruction of Fermi and eROSITA Bubbles from Magnetized Jet Eruption with Simulations

IF 2.5 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Universe Pub Date : 2024-06-27 DOI:10.3390/universe10070279
Che-Jui Chang, Jean-Fu Kiang
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Abstract

The Fermi bubbles and the eROSITA bubbles around the Milky Way Galaxy are speculated to be the aftermaths of past jet eruptions from a supermassive black hole in the galactic center. In this work, a 2.5D axisymmetric relativistic magnetohydrodynamic (RMHD) model is applied to simulate a jet eruption from our galactic center and to reconstruct the observed Fermi bubbles and eROSITA bubbles. High-energy non-thermal electrons are excited around forward shock and discontinuity transition regions in the simulated plasma distributions. The γ-ray and X-ray emissions from these electrons manifest patterns on the skymap that match the observed Fermi bubbles and eROSITA bubbles, respectively, in shape, size and radiation intensity. The influence of the background magnetic field, initial mass distribution in the Galaxy, and the jet parameters on the plasma distributions and hence these bubbles is analyzed. Subtle effects on the evolution of plasma distributions attributed to the adoption of a galactic disk model versus a spiral-arm model are also studied.
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通过模拟重建磁化喷流喷发产生的费米气泡和 eROSITA 气泡
据推测,银河系周围的费米气泡和 eROSITA 气泡是过去银河系中心超大质量黑洞喷流爆发的后遗症。在这项工作中,我们采用了一个 2.5D 轴对称相对论磁流体力学(RMHD)模型来模拟银河系中心的喷流爆发,并重建了观测到的费米气泡和 eROSITA 气泡。高能非热电子在模拟等离子体分布中的前向冲击和不连续转变区域周围被激发。这些电子发射的 γ 射线和 X 射线在天图上显示出的图案在形状、大小和辐射强度上分别与观测到的费米气泡和 eROSITA 气泡相吻合。分析了背景磁场、银河系初始质量分布和喷流参数对等离子体分布以及这些气泡的影响。此外,还研究了星系盘模型和旋臂模型的采用对等离子体分布演变的微妙影响。
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来源期刊
Universe
Universe Physics and Astronomy-General Physics and Astronomy
CiteScore
4.30
自引率
17.20%
发文量
562
审稿时长
24.38 days
期刊介绍: Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.
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