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arXiv 1607.08862astro-ph.HE
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银河微风中的宇宙射线

Cosmic Rays in a Galactic Breeze

Andrew M. Taylor, Gwenael Giacinti

摘要:

受发现的非热费米泡功能下面和上面的银河平面,我们调查的情况下,这些气泡是通过银河系中心流出形成的。宇宙射线(CR)在银河微风外流中扩散和平流,与周围的气体相互作用,产生伽马射线发射,提供了一个近似平坦的表面亮度分布,如观察到的。应用相同的流出轮廓进一步内的磁盘,由此产生的影响,可观察到的CR光谱特性的确定。硬化的光谱由于在一个特定的能量范围内的平流和扩散传播的竞争被注意到,即使在限制的情况下,在磁盘和晕中的CR扩散系数相等。据推测,这种硬化效应可能与在$\approx 200$ GV刚度下CR谱中观察到的硬化特征有关。

英文摘要:

Motivated by the discovery of the non-thermal Fermi bubble features both below and above the Galactic plane, we investigate a scenario in which these bubbles are formed through Galacto-centric outflow. Cosmic rays (CR) both diffusing and advecting within a Galactic breeze outflow, interacting with the ambient gas present, give rise to gamma-ray emission, providing an approximately flat surface brightness profile of this emission, as observed. Applying the same outflow profile further out within the disk, the resultant effects on the observable CR spectral properties are determined. A hardening in the spectra due to the competition of advective and diffusive propagation within a particular energy range is noted, even in the limiting case of equal CR diffusion coefficients in the disk and halo. It is postulated that this hardening effect may relate to the observed hardening feature in the CR spectrum at a rigidity of $\approx 200$ GV.

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