Unraveling the mysteries of our Milky Way black hole Sagittarius A
Sara Issaoun
Harvard CfA

In 2022 and 2024, the Event Horizon Telescope (EHT) collaboration revealedthe first images of the shadow of our Milky Way supermassive black hole,Sagittarius A* (Sgr A*), in total intensity and in polarization. Sinceits detection in the mid-70s, this bright radio source in the GalacticCenter was shrouded in a veil of mystery. The Nobel-awarded stellarorbits research in the Galactic Center pinned down its mass and distance,showing evidence of an extremely compact 4 million-solar-mass object atthe heart of our Galaxy. The EHT then provided the first direct evidencethat this object is indeed a black hole and resolved its shadow for thefirst time. In this talk, I will explain the challenges of imaging Sgr A*,how these challenges were overcome with the EHT, and future prospectsfor making new discoveries about our Milky Way black hole with radioobservations.

Date:	Mardi, le 4 novembre 2025
Heure:	15:30
Lieu:	Université McGill
	Ernest Rutherford Physics, R.E. Bell Conference Room (room 103)