ASCA image of SN1006

The correct answer is that the image tells you that the emission is generated in the outer edges of the remnant. You remember that images can only tell you where the emission comes from, not what processes generated the emission. To answer that question you have to look a little further.

You decide to examine:

ASCA spectra of the lobes of SN1006

ASCA spectra of the center of SN1006. There could be something interesting heppening there!