What are the "gridded" regions in the middle? Is that some kind of measurement artifact?
If you're talking about the purple blotches, that's a map of the regions of the sky that have been targeted for observation. It's not the actual SMBH density.
alt Hacker News
If you're talking about the purple blotches, that's a map of the regions of the sky that have been targeted for observation. It's not the actual SMBH density.