Gamma-ray Astronomy (The Short Story…). The Big Picture l Whole sky glows l Extreme environments l Probes of the Universe CGRO/EGRET All Sky Map.

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Presentation transcript:

Gamma-ray Astronomy (The Short Story…)

The Big Picture l Whole sky glows l Extreme environments l Probes of the Universe CGRO/EGRET All Sky Map

Early Gamma-ray Astronomy Gamma-ray Bursts Vela Program : A Bomb or Not a Bomb? A few hundred events, a few hundred theories Gamma-ray Sources SAS-2 – discovered 2 pulsars (1972) COS-B – about 25 sources ( ) Most unidentified, but 1 quasar Diffuse extra-galactic background

Vela Program ( )

CGRO ( )

Dr. Arthur Holly Compton 1927 Nobel Prize for Compton Effect First experimental proof of dual wave and particle nature of light

Sources of  -ray Emission Black holes Active Galaxies Pulsars Gamma-ray bursts Diffuse emission Supernovae Unidentified

BATSE

Gamma-Ray Bursts

Distribution of GRBs in the Sky

OSSE

The Galactic Center Region

Antimatter Fountain in the Center of Milky Way

COMPTEL

26 Al COMPTEL sky map

EGRET

High Energy Halo around Milky Way Courtesy of D. Dixon, University of California, Riverside

Gamma-ray Burst Progress l Beppo/SAX finds evidence for X-ray afterglow from several GRBs (2/28/97) l Jan van Paradijs finds optical afterglow l Redshifts indicate cosmological distances (Keck, HST) l ROTSE catches GRB in the act at visible wavelengths (1/23/99) l Evidence mounts for two types of GRBs

What BeppoSAX Saw

What HST Saw (Much Later)

Models for GRBs HypernovaMerging Neutron Stars

New Missions = Better Data Swift (2003)GLAST (2005) HETE II (launched 10/9/00)INTEGRAL (2001) Swift

Repoints within 50 s after detecting GRB to obtain X-ray and optical data Detects about 300 GRBs per year and their afterglows Sends initial coordinates of burst to ground within 15 s Sends high resolution coordinates of GRB to ground within 50 s Determines distance to burst within 1000 seconds

Explore the era of star formation in the universe, the physics of dark matter and the creation and evolution of galaxies Science

GLAST design

GLAST Technologies

GLAST All Sky Map

For More Information l Imagine the Universe! - l Swift Mission - l GLAST Mission - l CGRO Mission -

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