Northwestern Events Calendar


Radio Astronomy Seminar: Roger Blandford: The Evolution of Extragalactic Radio Sources

When: Wednesday, February 19, 2020
12:00 PM - 1:00 PM Central

Where: Technological Institute, Tech F160, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students

Contact: Yas Shemirani  

Group: Physics and Astronomy Radio Astronomy Seminars

Category: Academic


Much of the history of radio astronomy concerns sources like Cygnus A, first observed in the late 1930s. Originally thought to be stars, they were eventually shown to comprise double sources straddling distant galaxies. It was then discovered that these are powered by anti-parallel, relativistic jets emanating from the nuclei of these galaxies which are exceptionally bright when pointed in our direction. Today we know that they are formed near massive black holes, no larger than our solar system. The theoretical interpretation has evolved in parallel and is now focused on identifying the rotational energy of the black hole as the power source and attributing the collimation of the jets to helical magnetic field twisted by a disk of infalling and outflowing gas. The talk will conclude with a discussion of the implications of the observations of M 87 (Virgo A) by the Event Horizon Telescope Collaboration and future prospects for learning more about these fascinating astronomical sources.


Roger Blandford, KIPAC, Stanford University


Host: Zadeh


Keywords: Physics, Astronomy, Radio Astronomy

Add to Calendar

Add Event To My Group:

Please sign-in