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We present the analysis of Fermi Large Area Telecope (LAT) data of thegamma-ray emission in the vicinity of a radio supernova remnant (SNR),G045.7$-$00.4. To study the origin of the gamma-ray emission, we also make useof the CO survey data of Milky Way Imaging Scroll Painting to study the massivemolecular gas complex that surrounds the SNR. The whole size of the GeVemission is significantly larger than that of the radio morphology. Above 3GeV, the GeV emission is resolved into two sources: one is spatially consistentwith the position of the SNR with a size comparable to that of the radioemission, and the other is located outside of the western boundary of the SNRand spatially coincident with the densest region of the surrounding molecularcloud. We suggest that the GeV emission of the western source may arise fromcosmic rays (CRs) which have escaped the SNR and illuminated the surroundingmolecular cloud. We find that the gamma-ray spectra of the western source canbe consistently explained by this scenario with a total energy of $\sim10^{50}{\rm erg}$ in escaping CRs assuming the escape is isotropic.

astrophysical journal/the astrophysical journal

Fermi-LAT detection of extended gamma-ray emission in the vicinity of  SNR G045.7$-$00.4: evidence for escaping cosmic rays interacting with the  surrounding molecular clouds