费米晕状辐射的起源：费米气泡的新模型
The Origin of the Fermi Halo-like Emission: A New Model of the Fermi Bubbles
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中文总结 AI 辅助
本研究通过对费米伽马射线数据的模板拟合，证实Totani（2025）报道的晕状辐射真实存在，认为其源于费米气泡而非暗物质湮灭，还构建了含扁平气泡、内部气泡及茧状结构的费米气泡新模型，为探究其起源提供了新依据。
中文摘要 AI 辅助
我们研究了高银纬区0.3至900 GeV能量范围内的伽马射线天区，寻找高银纬区以及银河恒星晕区域中超出已知天体物理辐射的贡献，这些已知辐射包括银河弥散辐射、主要为河外的各向同性伽马射线背景、费米气泡、Loop I、银心超出的贡献，以及费米-LAT合作组探测到的已知点状和延展伽马射线源。我们对费米伽马射线数据进行了一系列模板拟合，测试了银河天区的不同感兴趣区域，利用大量替代的银河弥散辐射模型，并采用了替代拟合方案以评估伽马射线天空建模复杂度提升带来的影响。我们发现Totani（2025）近期报道的晕状辐射是真实存在的，但它很可能源于费米气泡的辐射，而非银河晕中的暗物质湮灭。我们提供了费米气泡的新模板，包括更新后的扁平气泡模型，以及其亚结构——茧状结构和内部气泡的详细模型。这些组件结合起来可以解释之前报道的晕状辐射。我们还估算了扁平气泡、内部气泡和茧状结构的相关流量和谱特性。这一更新后的费米气泡模型为理解其起源提供了新的输入。
英文摘要
We study the gamma-ray sky at high latitudes for energies between 0.3 and 900 GeV. We search for a contribution in the high-latitude sky and in the region of the Galactic Stellar Halo that would be beyond known astrophysical emissions, i.e., the galactic diffuse emission, the isotropic mostly extragalactic gamma-ray background, the Fermi Bubbles, Loop I, the contribution from the Galactic Center Excess, and the known point and extended gamma-ray sources detected by the Fermi-LAT Collaboration. We perform a sequence of template fits to the Fermi gamma-ray data, testing different regions of interest of the galactic sky, utilizing a large set of alternative galactic diffuse emission models, and implementing alternative fitting schemes to assess the impact of increased modeling complexity of the gamma-ray sky. We find that the halo-like emission recently reported by Totani (2025) is real, but it is likely due to emission from the Fermi Bubbles rather than dark matter annihilation in the Galactic halo. We provide new templates for the Fermi Bubbles, including an updated model for the Flat Bubbles and a detailed model of their substructures, the Cocoons and the Inner Bubbles. In combination, these components account for the previously reported halo-like emission. We also estimate the associated fluxes and spectral properties of the Flat Bubbles, the Inner Bubbles, and the Cocoons. This updated model for the Fermi Bubbles provides new input toward understanding their origin.
发表机构
- Oakland University（奥克兰大学）
- City University of Hong Kong（香港城市大学）
机构由 AI 辅助整理，请以论文原文为准。
