Virial theorem

Interview with James Gunn, American astronomer and Emeritus Eugene Higgins Professor of Astronomy at Princeton University. Gunn discusses his graduate work at Caltech where he worked with Guido Munch. He describes his graduate thesis on the correlation function of galaxies and recalls his growing interest in cosmology at the time. Gunn traces the development of dark matter research during the 1970s and 1980s, reflecting on the important contributions of his peers as well as his own. He discusses his other research interests such as Omega matter and virial discrepancy. Gunn also describes his role in the growth of the cosmology department at Caltech. 

Interview with astrophysicist and cosmologist Neta Bahcall, the Eugene Higgins Professor of Astronomy at Princeton University. Bahcall discusses her undergraduate studies in physics and math in Israel before her move to Caltech. She recounts her PhD work with her advisor, William Fowler, as well as collaborations with Maarten Schmidt. Bahcall explains how she was studying nuclear physics at Caltech when she first learned of the virial discrepancy and became interested in galaxy clusters, prompting her to shift her studies toward astronomy. Bahcall describes her work on quasars and the beginnings of her work in cosmology. Throughout the interview, she provides an overview of galaxy cluster research in the 1970s, as well as the beginnings of dark matter research. Bahcall discusses many of her influential papers over the years, on topics such as clusters, large construction, dark matter and omega matter. She describes how her research on clusters relates to cosmology, as well as how her work intersects with radio astronomy. Bahcall reflects on the impact of being a woman in the field, and at the end of the interview, she shares memories from the 1985 IAU meeting on dark matter.