论文标题
MEV伽马射线成像光谱观察银河中心和宇宙背景Mev Gammas smile-2+气球实验
MeV Gamma-ray imaging spectroscopic observation for Galactic Center and Cosmic Background MeV gammas by SMILE-2+ Balloon Experiment
论文作者
论文摘要
最近，关于MEV和Sub-GEV量表的轻暗物质（DM）的可能性似乎有很多论文。到目前为止，仅积分和COMPTEL提供了511KeV的银河中心的实验数据，以及两个银河弥漫性MEV Gammas（GDMG）和Comptel提供了宇宙背景MEV Gammas（CBMG），以用于宽阔的天空，以间接检测光DMS。然而，除511KeV外，尽管观察到了10年，但漫射伽玛的这些光谱仍包括大量统计和系统错误，因为两种仪器都遭受了空间严重的背景辐射的严重辐射。在2018年4月，我们（京都大学的漫画漫画集团中的微笑项目）观察到Mev Gamma Rays通过Electron Tracking Compton Camera（ETCC）使用Jaxa Balloon在澳大利亚使用Electron Tracking Compton Camera（ETCC）。 （Smile2+ Project）通过测量每个伽玛中康普顿散射的所有参数，ETCC首次获得了与光学望远镜一样相同的MEV Gammas的完整方向，并且还将信号伽玛与空间中的巨大背景伽玛斯区分开。在这一观察结果中，具有众多3SR领域的ETCC观察到来自所有天空的MEV伽马仪，包括银河中心，半盘，半磁盘，螃蟹和大多数CBMG，通过重建Compton的过程，我们成功地通过230％的flive降低了纯净的flife，从而通过更高的角度将纯净的flive降低了Compton的过程，并通过将gamma fluck降低了，这是通过gamma flake的范围，这些阶段是通过gamma flage flage flage，gamma gamma是通过更加明确的fifters flage，gamma gambas gamma gammas，gammas是通过gamma flage facterics centerive〜降低了。视图，这与CBMG和GDMG的比率一致。现在，在银河系中心周围分别用〜5和> 10的Sigma检测到511Kev Gammas GDMG。同样，我们在CBMG总体事件中仅获得了相当低的Background，在CBMG中获得了接近105个Events。因此，我们获得了高统计数据和非常低的系统学的良好数据，甚至有一天的观察。
Recently, there appears lots of papers on the possibility of light Dark Matter (DM) in MeV and sub-GeV scale. Until now, only INTEGRAL and COMPTEL provided experimental data of 511keV of galactic center, and two spectra of Galactic Diffuse MeV gammas (GDMG), and COMPTEL provided the Cosmic Background MeV gammas (CBMG) for wide sky for indirect detection of light DMs. However except 511keV, those spectra for diffuse gammas included large statistical and systematic errors in spite of 10 years observation, since both two instruments suffered from severe background radiation in space. In 2018 April, we (SMILE-project in Comic-ray Group of Kyoto University) have observed MeV gamma rays for whole southern sky by Electron Tracking Compton Camera (ETCC) using JAXA balloon at Australia during one-day. (SMILE2+ Project) By measuring all parameters of Compton scattering in every gamma, ETCC has achieved for the first time to obtain the complete direction of MeV gammas as same as optical telescopes, and also to distinguish signal gammas from huge background gammas in space clearly. In this observation, ETCC with a large Field of View of 3sr observed MeV gammas from 3/5 of all sky including galactic centre, a half disk, crab, and most of CBMG By reconstructing the Compton process, we successfully obtained pure comic gammas by reducing background by more 2 orders, which is clearly certificated by the clear enhancement of detected gamma flux with ~30% during galactic center passing through the Field of View, which is consistent with the ratio of CBMG and GDMG. Now 511keV gammas GDMG are preliminarily detected with ~5 and >10 sigma respectively around Galactic Centre. Also we have obtained near 105events of CBMG in with quite low background of only a few 10% in total CBMG events. Thus we obtained good data for both with high statistics and very low systematics even one day observation.
