Astro Seminar Series - VIA ZOOMExport this event to calendar

Wednesday, November 9, 2022 — 11:30 AM EST

sara_issaoun_headshotSara Issaoun is an NHFP Einstein Fellow at the Center for Astrophysics | Harvard & Smithsonian and a member of the Event Horizon Telescope collaboration. Her research centers around the collection, calibration, and imaging of millimeter-wave radio observations of supermassive black holes. Sara aims to expand millimeter-wave radio imaging capabilities and forge strong connections between the first images of supermassive black hole shadows and physics probed by partner facilities across the electromagnetic spectrum. Multi-wavelength constraints on black hole accretion flow properties will critically inform the scientific interpretation of images of black hole shadows, our understanding of jet-launching mechanisms, black hole spin measurements, and, ultimately, precision tests of General Relativity.

Talk title and abstract

Our supermassive black hole Sagittarius A* across the radio band

Last Spring, the Event Horizon Telescope collaboration revealed the first images of the shadow of our Milky Way supermassive black hole, Sagittarius A* (Sgr A*). Since its detection in the mid-70s, this bright radio source in the Galactic Center was shrouded in a veil of mystery. The Nobel-awarded stellar orbits research in the Galactic Center pinned down its mass and distance, showing evidence of an extremely compact 4 million-solar-mass object at the heart of our Galaxy. The EHT then provided the first direct evidence that this object is indeed a black hole and resolved its shadow for the first time. In this talk, I will explain the challenges of imaging Sgr A* and how these were overcome by the EHT, and I will walk through important milestones of discovery across the radio band that laid the foundation for the first image of our black hole.

<--break->This will be a hybrid seminar. If you would like to join in person, please meet in the Physics building (Room 308). Would you like to join this seminar via Zoom?  Please email WCA.

Location 
PHY - Physics
Virtual Meeting
200 University Avenue West

Waterloo, ON N2L 3G1
Canada

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