arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.08604astro-ph.HE
收藏

星际Gamma-Ray逆康普顿辐射空间模型的启示--来自射电和微波同步辐射研究

Implications on Spatial Models of Interstellar Gamma-Ray Inverse-Compton Emission from Synchrotron Emission Studies in Radio and Microwaves

E. Orlando

摘要:

宇宙射线与银河系中的气体和光子场相互作用,产生星际伽马射线发射(IGE),它占在伽马射线能量下探测到的光子的近50%。这个IGE的模型必须非常精确,以解释目前的伽马射线望远镜,如费米大面积望远镜(LAT)的高质量观测。IGE的标准模型,作为参考模型的费米LAT数据的分析,显示空间差异的数据,强调更现实的模型的必要性。产生IGE的逆康普顿分量的相同CR电子也产生在无线电和微波中观察到的星际同步辐射。然而,目前的标准模型没有利用来自这种星际同步辐射的研究结果。考虑到这些结果,在这项工作中,我们将展示它们如何影响IGE的大规模逆康普顿分量的计算空间图,这通常用于费米LAT数据的研究。结果发现,这些结果显着影响这些空间模型地图,甚至在60%的水平。特别是,传播模型的基础上同步加速器的研究产生了更多的峰值逆康普顿发射在银河系内部区域相对于用于分析费米LAT数据的标准模型。结论是,无线电和微波观测可以包括在一个多频自洽的方法,一个更准确的建模的IGE最终的物理综合解释的伽马射线数据及其目前无法解释的功能。给出了模型参数,为高能γ射线研究提供了更符合实际的依据。

英文摘要:

Cosmic rays interacting with gas and photon fields in the Galaxy produce interstellar gamma-ray emission (IGE), which accounts for almost 50% of the photons detected at gamma-ray energies. Models of this IGE have to be very accurate for interpreting the high-quality observations by present gamma-ray telescopes, such as Fermi Large Area Telescope (LAT). Standard models of IGE, used as reference models for analyses of the Fermi LAT data, show spatial discrepancies with respect to the data, underlining the necessity of more realistic models. The same CR electrons that produce the inverse-Compton component of the IGE produce also interstellar synchrotron emission observed in radio and microwave. However, present standard models do not take advantage of results coming from studies of this interstellar synchrotron emission. Accounting for such results, in this work we show how they affect the calculated spatial maps of the large-scale inverse-Compton component of the IGE, which are usually used in studies of Fermi LAT data. It is found that these results significantly affect these spatial model maps even at a 60% level. In particular, propagation models based on synchrotron studies produce a more peaked inverse-Compton emission in the inner Galaxy region with respect to the standard models used to analyze Fermi LAT data. The conclusion is that radio and microwave observations can be included in a multifrequency self-consistent approach for a more accurate modeling of the IGE finalized to a physical comprehensive interpretation of gamma-ray data and its present unexplained features. Model parameters are provided, which supply a more realistic basis for high-energy gamma-ray studies.

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。

↑