NuSTAR Observations of G11.2–0.3

Abstract

We present in this paper the hard X-ray view of the pulsar wind nebula in G11.2−0.3 and its central pulsar powered pulsar J1811−1925 as seen by NuSTAR . We complement the data with Chandra for a more complete picture and confirm the existence of a hard, power-law component in the shell with photon index , which we attribute to synchrotron emission. Our imaging observations of the shell show a slightly smaller radius at higher energies, consistent with Chandra results, and we find shrinkage as a function of increased energy along the jet direction, indicating that the electron outflow in the PWN may be simpler than that seen in other young PWNe. Combining NuSTAR with INTEGRAL , we find that the pulsar spectrum can be fit by a power law with up to 300 keV without evidence of curvature.