We report on a discovery of a diffuse nebula containing a pointlike source in the southern blowout region of the Cygnus Loop supernova remnant, based on Suzaku and XMM-Newton observations. The X-ray spectra from the nebula and the pointlike source are well represented by an absorbed power-law model with photon indices of 2.2 ± 0.1 and 1.6 ± 0.2, respectively. The photon indices as well as the flux ratio of F nebula/F pointlike ~ 4 lead us to propose that the system is a pulsar wind nebula, although pulsations have not yet been detected. If we attribute its origin to the Cygnus Loop supernova, then the 0.5-8 keV luminosity of the nebula is computed to be 2.1 × 1031 (d/540 pc)2 erg s-1, where d is the distance to the Loop. This implies a spin-down loss-energy \dot{E}\sim 2.6\times 10^{35} (d/540 pc)2 erg s-1. The location of the neutron star candidate, ~2° away from the geometric center of the Loop, implies a high transverse velocity of ~1850 (θ/2°) (d/540 pc) (t/10 kyr)-1 km s-1, assuming the currently accepted age of the Cygnus Loop.
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