Forgot your password?
A Clash of Clusters Provides New Clue to Dark Matter
GLAST Lunch - Luigi Costamante
Document Actions
GLAST Lunch - A. Nepomuk Otte (on behalf of the MAGIC collaboration)
| What | GLAST lunch |
|---|---|
| When |
31 July 08 from 12:15 pm to 01:15 pm |
| Where | 3rd Floor KAVLI Conf Room |
| Contact Name | David Paneque |
| Contact Email | dpaneque@slac.stanford.edu |
| Contact Phone | 650-926-5542 |
| Add event to calendar |
vCal (Windows, Linux)
iCal (Mac OS X)
|
Detection of the Crab pulsar above 25 GeV with the MAGIC telescope
In 2005 we observed a 3 sigma excess of pulsed gamma-ray emission from the Crab pulsar with the MAGIC air Cherenkov telescope. The hint of pulsed emission was a driving force to develop a new trigger system, which allowed us to lower the energy threshold of the telescope from 60 GeV to about 25 GeV. With the new trigger system we observed the Crab pulsar between October 2007 and February 2008, and detected the Crab pulsar with a significance of 6.4 standard deviations.
This is the first time that a pulsar has been detected in gamma rays above 25 GeV. It is an important achievement because gamma rays of such energies provide direct information about the non-thermal processes in the magnetosphere of a pulsar.
From previous non-detections above 100 GeV it is known that the spectral energy distribution of the Crab pulsar exhibits a steep turnover above 10 GeV. The point at which the spectrum turns over and the shape of the turnover provide information about the acceleration of particles in the magnetosphere. I also discuss the pulse profile, and compare it to EGRET data at lower energies.
MASS: Lance Simms