The image from 2009-04-20 01:54:28 shows a typical IRAS 100 micron image:
There’s a very detectable pattern of lines crossing the image from top left to bottom right. These are remnants of the scan lines used in taking the data. The team that built the IRIS survey, headed by Marc-Antoine Miville-Deschenes and Guilaine Lagache reprocessed the data to — among other things — get rid of, or at least minimize, these scan lines. If we simply choose the IRIS100 survey with identical parameters we get the image below. The scan lines are completely gone. That’s why it’s IRIS: the ‘Improved’ Reprocessing of the IRAS Survey. Nice job guys!
