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This Week at Physics

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Event Number 4308

  Thursday, October 20th, 2016

Astronomy Colloquium
A Connection Between Stellar Coronae and Black-Hole Accretion-Disk Coronae
Time: 3:30 pm
Place: 4421 Sterling Hall, Coffee and cookies 3:30 PM, Talk at 3:45 PM
Speaker: Prof. Ehud Behar, Department of Physics and Asher Space Research Institute Technion, Visiting Professor Department of Astronomy University of Maryland, College Park
Abstract: Stellar coronae are known for their million degree plasma that is magnetically energized and emits bright X-rays.
The X-ray source in black hole accretion disks is also referred to as a corona, although its observed properties, e.g., spectra, luminosity, temperature, and variability are remarkably different from those of stellar coronae.
In fact, the physical mechanisms controlling accretion disk coronae remain largely unknown.
The colloquium will show that radio and mm observations of active galaxies (AGN) could be key to understanding the X-ray coronae of super-massive black holes. These suggest that perhaps stellar and accretion-disk coronae have more in common than meets the eye (or the telescope).
Host: Professor Marina Orio
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