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arXiv 0910.4583astro-ph.HE
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费米霾:微波霾的对应物--Gamma-Ray

The Fermi Haze: A Gamma-Ray Counterpart to the Microwave Haze

Gregory Dobler, Douglas P. Finkbeiner, Ilias Cholis, Tracy R. Slatyer, Neal Weiner

摘要:

费米伽马射线太空望远镜揭示了一个弥漫的逆康普顿信号在银河系内部与一个类似的空间形态的微波烟雾观察到的WMAP,支持同步辐射的微波信号的解释。使用空间模板,我们回归出π 0伽玛,以及IC和韧致辐射组件与已知的软同步辐射对应。我们发现银河系中心有显着的伽马射线过量,其光谱比其他天空成分明显更硬,并且与来自硬电子群的IC最一致。其形态和光谱与其作为在WMAP频率下产生微波雾的电子的IC对应物一致。此外,隐含的电子光谱是硬的;在盘中的超新星冲击中加速的电子,然后扩散几kpc到雾区,将具有较软的光谱。我们描述了在这个分析中使用的全天费米图,并提供下载。

英文摘要:

The Fermi Gamma-Ray Space Telescope reveals a diffuse inverse Compton signal in the inner Galaxy with a similar spatial morphology to the microwave haze observed by WMAP, supporting the synchrotron interpretation of the microwave signal. Using spatial templates, we regress out pi0 gammas, as well as IC and bremsstrahlung components associated with known soft-synchrotron counterparts. We find a significant gamma-ray excess towards the Galactic center with a spectrum that is significantly harder than other sky components and is most consistent with IC from a hard population of electrons. The morphology and spectrum are consistent with it being the IC counterpart to the electrons which generate the microwave haze seen at WMAP frequencies. In addition, the implied electron spectrum is hard; electrons accelerated in supernova shocks in the disk which then diffuse a few kpc to the haze region would have a softer spectrum. We describe the full sky Fermi maps used in this analysis and make them available for download.

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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