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arXiv 2207.09189astro-ph.HE
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费米泡发射的银河风起源

Galactic breeze origin for the Fermi bubbles emission

Olivier Tourmente, Donna Rodgers-Lee, Andrew M. Taylor

摘要:

费米泡的起源仍然不清楚,它构成了银河平面上方和下方的两个伽马射线发射叶。费米泡的伽马射线发射起源于强子宇宙射线平流的亚音速银河外流,或微风的可能性,在这里进行了探讨。微风的解决方案和随后的宇宙射线传输的模拟进行了使用流体动力学代码,PLUTO,结合宇宙射线传输代码。得到的银河系外流模型被认为是兼容的费米泡区域中的气体的减速外流速度剖面的推论,和大量的热电离气体的存在下,在星系晕区域的证据。虽然简单,这个模型被认为是能够重现所观察到的费米-LAT能量通量在银河系高纬度地区。根据这些结果,对1-3~TeV光子的γ射线辐射作了预测,以便将来与CTA/SWGO测量作比较。

英文摘要:

The origin of the Fermi bubbles, which constitute two gamma-ray emitting lobes above and below the Galactic plane, remains unclear. The possibility that this Fermi bubbles gamma-ray emission originates from hadronic cosmic rays advected by a subsonic Galactic outflow, or breeze, is here explored. The simulation of a breeze solution and subsequent cosmic ray transport is carried out using the hydrodynamical code, PLUTO, in combination with a cosmic ray transport code. The Galactic outflow model obtained is found to be compatible with both inferences of the decelerating outflow velocity profile of the gas in the Fermi bubbles region, and evidence for the presence of a large amount of hot ionised gas out in the Galactic halo region. Although simple, this model is found to be able to reproduce the observed Fermi-LAT energy flux at high Galactic latitudes. Following these results a prediction concerning the gamma-ray emission for 1-3~TeV photons is made for future comparison with CTA/SWGO measurements.

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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