An unusual quasar
"14-Sep-2005: The detection of a super massive black hole without a massive host galaxy is the surprising result from a large Hubble and VLT study of quasars. This is the first convincing discovery of such an object. One intriguing explanation is that the host galaxy may be made almost
exclusively of dark matter. "
http://www.spacetelescope.org/news/html/heic0511.html