Dr. Emmanuel Momjian, National Radio Astronomy Observatory

Title: The Highest Redshift Quasars at the Highest Angular Resolutions 

Abstract: Quasars at the highest redshifts offer laboratories to study the interplay among supermassive black holes, the host galaxies and their larger environments during one of universe's most transformative epochs. In recent years, optical surveys revealed large samples of quasars out to z ≥ 7, and studies have shown that at such high redshifts we are effectively within the Epoch of Reionization, when the first stars and massive black holes were formed. Despite the large number of quasars discovered at high redshifts, observations at radio wavelengths show that only some are radio loud.

In this talk, I will present very high angular resolution studies on various radio-loud and radio-quiet quasars at redshifts z > 4. I will showcase results on extreme infra-red emitters at z > 4,  the most extended radio source discovered at z~6 and the highest redshift radio-loud source known-to-date within the Epoch of Reionization, at z=7. Throughout the presentation, I will briefly overview the radio-mm instruments used for these studies and conclude with some remarks on the next generation radio interferometer that will revolutionize this field of research and astronomy in general.