Loading Events

« All Events

  • This event has passed.

Physics Seminar: Windy Quasar Blows Away the Competition

November 13 @ 2:30 pm

Professor Sarah Gallagher,
Science Advisor to the President of the Canadian Space Agency University of Western

At cosmic noon, when the universe was about a third to a half its present age, both galaxies and their central, supermassive black holes went through phases of explosive growth when stars were formed in abundance and gas falling onto the black holes gave off tremendous amounts of light as quasars. Quasars are the prime suspects in two puzzles of galaxy evolution: why did the most massive galaxies stop forming stars and why are the masses of black holes and their host galaxies so well correlated? The best explanations to date for both are categorized as “feedback”, which generically means the injection of energy from the black hole system into the gas in the host galaxy to prevent the continuing production of stars and perhaps turn off the quasar itself.  I will present SDSS J1352+4239, a prime example of quasar wind feedback in action with the most powerful wind measured to date.

What Does a Science Advisor Do Anyway?

As the Science Advisor to the President of the Canadian Space Agency, I am charged with advising the agency and liaising with the Office of the Chief Science Advisor as part of an inter-departmental network. I’ll explain the role of science advice in the federal government and how the CSA is incorporating science priorities into plans for the future.

If you are interested in joining in this seminar, please contact Nancy Robichaud at nrobicha@ubishops.ca by Thursday, November 12 to receive the Zoom link.


November 13
2:30 pm
Event Categories:




Physics Department
819-822-9600 ext. 2355