The Transient Universe: AY 250 Spring 2007 New High Energy Telescopes Geoff Bower.

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Presentation transcript:

The Transient Universe: AY 250 Spring 2007 New High Energy Telescopes Geoff Bower

The Transient Universe: AY 250 Spring 2007 EGRET Instrument on CGRO –NASA Great Observatory 20 MeV – 30 GeV 1500 cm^2 5 arcmin for strong sources

The Transient Universe: AY 250 Spring 2007 EGRET

The Transient Universe: AY 250 Spring 2007 Hartman et al sources 66 blazars 5 pulsars 170 unidentified

The Transient Universe: AY 250 Spring 2007 EGRET Blazars Mattox et al 1997

The Transient Universe: AY 250 Spring 2007 Compact & Flat Spectrum

The Transient Universe: AY 250 Spring 2007 Compact

The Transient Universe: AY 250 Spring 2007 Variable Mukherjee et al 1997

The Transient Universe: AY 250 Spring C 279 Wehrle et al 1997

The Transient Universe: AY 250 Spring 2007 Ubertini 2007

The Transient Universe: AY 250 Spring 2007 Dominant in Energy

The Transient Universe: AY 250 Spring 2007 Extragalactic Background EGRB Narumoto & Totani 2006

The Transient Universe: AY 250 Spring 2007 GLAST

The Transient Universe: AY 250 Spring 2007

Michelson 2007

The Transient Universe: AY 250 Spring 2007

Padovani 2007

The Transient Universe: AY 250 Spring 2007 MAGIC result

The Transient Universe: AY 250 Spring 2007

HESS Atmospheric Cherenkov detector array 100 m^2 collecting area 5 deg FOV 0.16 deg resolution

The Transient Universe: AY 250 Spring 2007 HESS Camera 960 PMT pixels

The Transient Universe: AY 250 Spring 2007

Imaging Rejection of Cosmic Rays

The Transient Universe: AY 250 Spring 2007 Stereoscopic Vision

The Transient Universe: AY 250 Spring 2007 Cherenkov Basics Energy Range –1 TeV photon produces 100 photons/m^2 on the ground –Sensitivity set by ability to reject cosmic rays Effective Collecting Area –Not 4 x 100 m^2 –But 50,000 m^2 Light pool area (250 m diameter) Stereo vision –To reconstruct signal direction, reject cosmic rays

The Transient Universe: AY 250 Spring 2007 Cosmic Ray Discrimination

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