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Fig. 2


Top: zoom on the PWN region in the 1.2–6 keV image shown in Fig. 1 (right). North is up and east to the left. The region is annotated with the annulus regions of radii R1, R2, and R3 (15′′, 60′′, and 150′′) used in the morphological and spectral analysis. A contour at the level of 2.5 × 10-5 ph/cm2/s/arcmin2 is overlaid in red to outline the morphology of the inner nebula. Middle: radial profile of the PWN in the high-energy band (1.2–6 keV) extracted from a region centered on the pulsar. The best-fit two-components model (point-like + diffuse) is overlaid. Bottom: azimuthal profile extracted from the annulus region R1–R2 (15′′ < r < 60′′) illustrated in the top panel in the high-energy band. Position angle 0° corresponds to the west and 90° to the north. Two significant enhancements over the mean value (dashed line) are seen at  ~50° and  ~230°. The fact that these knots of emission are separated by 180° is suggestive of a jet morphology.

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