用ARGO-YBJ研究银道面弥散gamma-ray辐射
Study of the diffuse gamma-ray emission from the Galactic plane with ARGO-YBJ
摘要：
分析了雅高-YBJ在五年多的数据收集中记录的事件，以确定在银道25° <1 < 100°和银道纬度的银道面中的弥散伽马射线发射。这个分析所涵盖的能量范围，从~350 GeV到~2 TeV，可以将费米探索的区域与米拉格罗进行的多TeV测量联系起来。我们的分析集中在银河平面的两个选定区域，即，40° < l < 100°和65° < l < 85°（天鹅座地区），在那里，米拉格罗观察到了相对于当前模型预测的超额。为了掩盖最强烈的伽马射线源，包括最近由ARGO-YBJ确定的天鹅座茧的TeV对应物，并消除残余贡献，已经采取了非常谨慎的措施。ARGO-YBJ的结果并没有显示出任何多余的亚TeV的能量对应的多余的米拉格罗发现，并与费米模型的弥漫银河系发射的预测一致。从测得的能量分布，我们推导出光谱指数和微分通量在1 TeV的扩散伽马射线发射在天空区域的调查。
英文摘要：
The events recorded by ARGO-YBJ in more than five years of data collection have been analyzed to determine the diffuse gamma-ray emission in the Galactic plane at Galactic longitudes 25° < l < 100° and Galactic latitudes . The energy range covered by this analysis, from ~350 GeV to ~2 TeV, allows the connection of the region explored by Fermi with the multi-TeV measurements carried out by Milagro. Our analysis has been focused on two selected regions of the Galactic plane, i.e., 40° < l < 100° and 65° < l < 85° (the Cygnus region), where Milagro observed an excess with respect to the predictions of current models. Great care has been taken in order to mask the most intense gamma-ray sources, including the TeV counterpart of the Cygnus cocoon recently identified by ARGO-YBJ, and to remove residual contributions. The ARGO-YBJ results do not show any excess at sub-TeV energies corresponding to the excess found by Milagro, and are consistent with the predictions of the Fermi model for the diffuse Galactic emission. From the measured energy distribution we derive spectral indices and the differential flux at 1 TeV of the diffuse gamma-ray emission in the sky regions investigated.
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