Zacharias, NorbertJohnston, KennethBoboltz, DavidFey, Alan L.Gaume, RalphOjha, RoopeshMeier, David L.Murphy, David W.Jones, Dayton L.Unwin, Stephen C.Piner, B. Glenn2020-05-112020-05-112009-02-11Norbert Zacharias et al., What is the Structure of Relativistic Jets in AGN on Scales of Light Days?, https://ui.adsabs.harvard.edu/link_gateway/2009astro2010S.310W/PUB_PDFhttp://hdl.handle.net/11603/18536The structure of relativistic jets in AGN on scales of light days reveals how energy propagates through jets, a process that is fundamental to galaxy evolution. A deeper understanding of jet physics will clarify the differences between radio-loud and radio-quiet quasars that manifest themselves near the supermassive black hole. We can also use relativistic jets to identify supermassive binary black holes remaining from galaxy mergers, and use orbital motion to derive the masses of the black holes. The search for binary black holes in the nuclei of galaxies will yield important information on their overall lifetime and on the processes occurring in galaxies that affect black holes and quasars. High-precision astrometric measurements, made using the technique of optical interferometry on a space-based platform, such as SIM Lite, are the key to answering these questions.7 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Public Domain Mark 1.0This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Lawhttp://creativecommons.org/publicdomain/mark/1.0/Text