论文标题
银河系伽马射线发射的离散成分的建模以及对费米 - 拉特银河系过剩的影响
Improved Modeling of the Discrete Component of the Galactic Interstellar Gamma-ray Emission and Implications for the Fermi-LAT Galactic Center Excess
论文作者
论文摘要
这项工作的目的是改善与H2星际气体有关的伽马射线离散或小规模结构的模型。可靠地确定这一贡献对于从星际气体中解开伽马射线点源很重要，并且可以更好地表征扩展的伽马射线信号。值得注意的是，Fermi-Lat银河系中心（GC）过量的起源尚不清楚，可能是光滑的或类似点的。如果数据包含未充分建模的点状贡献，则可能会错误地认为平滑的GC多余的贡献是类似点的。我们改善了与H2相关的伽玛射线离散发射的模型，该模型通过H2 Proxies沿银河平面沿银河平面的$ 50^\ Times 1^\ Circ $区域更适合追踪这些功能。我们发现，这些可能对该区域的伽马射线费米 - 拉特数据产生重大贡献，并且最明亮的数据可能与检测到的费米 - 拉特源有关，这是对该方法的引人注目的验证。我们讨论将这种方法扩展到天空其他区域的前景以及对GC过剩的表征的影响。
The aim of this work is to improve models for the gamma-ray discrete or small-scale structure related to H2 interstellar gas. Reliably identifying this contribution is important to disentangle gamma-ray point sources from interstellar gas, and to better characterize extended gamma-ray signals. Notably, the Fermi-LAT Galactic center (GC) excess, whose origin remains unclear, might be smooth or point-like. If the data contain a point-like contribution that is not adequately modeled, a smooth GC excess might be erroneously deemed to be point-like. We improve models for the H2-related gamma-ray discrete emission for a $50^\circ \times 1^\circ$ region along the Galactic plane via H2 proxies better suited to trace these features. We find that these are likely to contribute significantly to the gamma-ray Fermi-LAT data in this region, and the brightest ones are likely associated with detected Fermi-LAT sources, a compelling validation of this methodology. We discuss prospects to extend this methodology to other regions of the sky and implications for the characterization of the GC excess.
