First-light at Pole: Images

The Moon: Note postive signal at center and negative signals at either side. Negative signals are due to chopping secondary. The chopper-throw was 0.5 degree. Smearing of image is due to motion of Moon with respect to celestial sphere.

RCW 57 is the positive signal in the upper row - slightly left of center. Note the negative signals - located 0.5 degree on either side of positive signal. These are due to chopping. The square-shaped structures seen in this image, and other features not associated with RCW57, are caused by microphonics and/or intermittent sky noise. Our detection of RCW 57 - at this same sky location - was confirmed in a second map not shown here.