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.
Why are some areas more observed than others then?
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.
Why are some areas more observed than others then?