Physics & Astronomy Colloquium
3:30 PM, Friday, November 30, 2012
Room 155, Chem-Phys Building
Dr. Mitchell Begelman
JILA and University of Colorado
Cosmic Linear Accelerators: Extreme Reconnection
and other Surprises from the Crab Nebula
The unexpected discovery of gamma-ray flares from the Crab Nebula may have surprising
implications for plasma astrophysics. Standard particle acceleration mechanisms cannot
account for the energies of the flaring photons. Instead, these observations point toward
an acceleration process involving rapid destruction of magnetic field through reconnection.
I will discuss the extreme particle acceleration process that may lead to the flares, and the
likely role of current-driven instabilities in triggering reconnection in the Crab and elsewhere.
Refreshments will be served in CP 177 at 3:15 PM