Search for line signal candidates in the Fermi-LAT data

Understand

In order to search for the line-like signals in the Fermi-LAT data, we have analyzed totally 49152 regions of interest (ROIs) that cover the whole sky.

• No ROI displays a line signal with test statistic (TS) value above 25, while for 50 ROIs weak line-like excesses with ${\rm TS}>16$ are presented.
• The intrinsic significances of these potential signals are further reduced by the large trial factor introduced in such kind of analysis.
• For the largest TS value of 24.3 derived in our analysis, the corresponding global significance is only $0.54\sigma$.