Image Details
Caption: Figure 10.
Photon index distribution of 2FLE sources (black, dotted) associated with a 4FGL one and their corresponding 4FGL-DR4 photon indices (blue, hatched). The 20–200 MeV energy band is critical for sampling the peak emission of these sources, as can be seen by the 2FLE index distribution peaking around Γ = 2.0 compared to the softer indices reported by their 4FGL associations.
© 2026. The Author(s). Published by the American Astronomical Society.