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High-energy gamma-ray emission from the Galactic plane above ~100 MeV iscomposed of three main contributions: diffuse emission from cosmic rayinteractions in the interstellar medium, emission from extended sources, suchas supernova remnants and pulsar wind nebulae, and emission from isolatedcompact source populations. The diffuse emission and emission from the extendedsources provide the dominant contribution to the flux almost everywhere in theinner Galaxy, preventing the detection of isolated compact sources. In spite ofthis difficulty, compact sources in the Galactic plane can be singled out basedon the variability properties of their gamma-ray emission. Our aim is to findsources in the Fermi data that show long-term variability. We performed asystematic study of the emission variability from the Galactic plane, byconstructing the variability maps. We find that emission from severaldirections along the Galactic plane is significantly variable on a time scaleof months. These directions include, in addition to known variable Galacticsources and background blazars, the Galactic ridge region at positive Galacticlongitudes and several regions containing young pulsars. We argue thatvariability on the time scale of months may be common to pulsars, originatingfrom the inner parts of pulsar wind nebulae, similarly to what is observed inthe Crab pulsar.

Search for variable gamma-ray emission from the Galactic plane in the Fermi data