A study of GeV gamma-ray emission towards supernova remnant G51.26+0.11 and its molecular environment

ABSTRACT We reanalyse the Fermi-LAT (Large Area Telescope) GeV γ-ray emission in region of supernova remnant (SNR) G51.26+0.11 and investigate its interstellar molecular environment with CO line data. At energies, based on 13.2 yr data, extended observed this is resolved into a uniform-disc source (‘Src A’) significance 19.5σ point (4FGL J1924.3+1628) 4.2σ 0.2–500 GeV. With an angular radius ∼0.17○, ‘Src A’ overlaps SNR significantly sight. On other hand, morphological coincidence between ∼+54 km s−1 clouds (MCs) together asymmetric or broad 12CO profiles near boundary provides evidence for very likely SNR–MC interaction. The interaction H i absorption features indicate that located at kinematic distance 6.2 ± 0.5 kpc. Combined results from multiwavelength analysis, can be naturally explained by hadronic model soft power-law proton spectrum index ∼2.25.