The topic map itself can be accessed here. It contains data (publications and authors) on just a handful of nearby objects. But it serves as a good introduction to topic maps.
We have used the Omnigator from Ontopia for this work. You too can try it out using the XML file: ned1.xtm. It uses just two associations viz. author-published-paper and paper-mentions-object. Only 8 objects (nearby galaxies), their references from ADS and the authors of those papers are used as subjects (topics) besides a few attributes like the RA, Dec and redshift.
People who have been involved are: Ashish Mahabal, George Djorgovski, Roy Williams, Robert Brunner, Joe Mazzarella, Barry Madore.
All figures below are in PNG format.