AGN ivo://jvo/agn JVO JVO admin help_desk@jvo.nao.ac.jp ACTIVE GALACTIC NUCLEI BLACK HOLES QUASARS A collection of QSO and AGN catalogs. http://ads.nao.ac.jp/abs/2010yCat.7258....0V Catalog Research public 1 http://jvo.nao.ac.jp/skynode/do/tap/agn ADQL 2.0 application/x-votable+xml