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GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 1
Gamma ray Large Area Space Telescope
(GLAST)Eduardo do Couto e Silva
SLAC Graduate Student Orientation – Sep 22, 2005
~ 200 people
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 2
GLAST Observatory : Timeline and Overview GLAST Observatory : Timeline and Overview
GLAST will measure the direction, energy and arrival time of celestial raysWill follow on the measurements by its predecessor (EGRET) with unprecedented capabilities
Large Area Telescope will record gamma-rays
in the energy range ~ 20 MeV to >300 GeV
GLAST Burst Monitor will provide correlative
observations of transient events in the
energy range ~10 keV – 25 MeV
LAT Construction ends
Early 2006
Thermal Vacuum Tests
First half of 2006
Spacecraft Integration
2006-2007
Launch DateAug 2007
GLAST Lifetime
5 years (min)
YOUR PhD
200X
GLAST will open
an energy window never explored before
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 3
Why Why rays ? rays ?
satellite
~ 500 km
centers of galaxiesemit gamma rays
• Universe is transparent to rays • not affected by magnetic fields• probes early Universe
most violent non-thermal processes found in Nature
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 4
Science with GLASTScience with GLAST
• High Energy Sky Survey : – Unidentified EGRET sources and GLAST Source Catalog
– unresolved point sources
– Population Studies– To avoid peculiarities of individual sources (AGN, Pulsars, SNR…)
– Diffuse Gamma ray emission– Galactic and Extragalactic– unresolved point sources
– Physics of particle acceleration – Jets in Active Galactic Nuclei (AGN)– energy conversion – shocks in Supernova Remnants (SNR)– role of hadrons in radiation processes
• High-energy behaviour of transients :– Gamma Ray Bursts– Solar Flares
• Discovery Potential:– New classes of astrophysical objects– Origin of Extragalactic Background– Searches for Dark Matter and Extra Dimensions– Tests of Lorentz Invariance
GLAST LAT strengths:All-sky monitoring
Broad range of time scalesEnergy range
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 5
LAT will Redefine the LAT will Redefine the Ray Sky Ray Sky
GLAST 1 yearGLAST 1 year
Source class Seen by EGRET
Predicted with
GLAST
Unidentified sources 170 ?
Rotation powered pulsars
3-6 100-500
Blazars 50-80 >2000
Normal galaxies 2 4-5
Gamma ray bursts 5 >500
Supernova Remnants/plerions
1-5 >10
Radio galaxies 1-1 ?
X ray binaries/microquasars
1-1 ?
Starburst galaxies 0 ?
Cluster of galaxies 0 ?
10 yrs of data recorded before GLAST !
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 6
Relativistic Outflows: AGN jetsRelativistic Outflows: AGN jets
• Most ray Jets from active galaxies are – Variable: relativistic jets– and point towards us !
• Radiation is produced by one or more of the following processes
– Synchrotron Self Compton– External Compton– Proton Induced Cascades– Proton Synchrotron
• Key issues to be addressed– Energetics of the source– jet formation– jet collimation– nature of the plasma – particle acceleration
(Buckley, Science, 1998)
Adapted from P. Coppi
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 7
Particle Acceleration: Origin of Cosmic RaysParticle Acceleration: Origin of Cosmic Rays
• Supernova Remnants– sites of galactic cosmic ray acceleration
• Question– Do rays originate from hadronic or leptonic processes?
Supernova remnant RX J1713.7-3946TeV rays (color)
keV X- rays (contours)
GLAST
e+/-
model
model
GLAST
Uchiyama (2003)Adapted from Aharonian’s talk at the
Texas Symposium 2004
• Measurements in the range of 100 MeV to 100 GeV - essential ingredient to resolve the origin (p vs e+/-)
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 8
Clumpy haloes increase the signal of high energy rays !
Origin of Dark MatterOrigin of Dark Matter
Milky Way
Dark matter halo
z = 20z = 50
z = 5z = 10
z = 0z = 1
B. Moore, www.nbody.net
If true, there may well bephotons in the energy range probed
by GLAST
0214
0113
31211
01
~~~~HaHaWaBa
q
q
Neutralino annihilations could create high energy rays ….
Neutralinos may not be the answer! The origin of Dark Matter may come from
Extra Dimensions…
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 9
Graduate Student on GLAST today…Graduate Student on GLAST today…
typical graduate student…
Data Analysis(is it an instrumental effect
or a software bug?)
Interpretation(understand how instrument works
to get a better handle on the science) Final Explanation
It’s fun to understand how a complex system
works
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 10
It only gets better…It only gets better…
Sharpen your knowledge of Science
BEFORE Launch (2007)
2 yrs from now YOU will be the first
to study one of the most exciting data sets
Implement in simulations what YOU have learned
(Data Challenges)
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 11
Do you want to do Science with GLAST?Do you want to do Science with GLAST?
Cohen-Tanugi, Johann
POST- DOC
Wang, Ping
YOU
YOUR NAME
GRADUATE STUDENTS
STAFF
Cameron, Robert
do Couto e Silva, Eduardo
Digel, Seth
Madejski, Grzegorz
Tajima, Hiroyasu
Wai, Lawrence L.Wai, Lawrence L.
[email protected]@slac.stanford.edu
Dubois, Richard
Bloom, Elliott
Blandford, Roger
Kamae, Tsuneyoshi (Tune)
Drell, Persis S.
Romani, Roger
Michelson, Peter
FACULTY
Healey, Stephen E.
GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005
E. do Couto e Silva 12
Come talk to the GLAST Faculty !Come talk to the GLAST Faculty !
Bloom, Elliott
Kamae, Tsuneyoshi (Tune)
Drell, Persis S.
Most of the time @ SLAC
Romani, Roger
Michelson, Peter
Most of the time @ Stanford Campus
Blandford, Roger
Found everywhere…
LAT Construction ends
Early 2006
Thermal Vacuum Tests
First half of 2006
Spacecraft Integration
2006-2007
Launch DateAug 2007
GLAST Lifetime
5 years (min)
YOUR PhD
200X
• High Energy Sky Survey : – Unidentified EGRET sources and GLAST Source Catalog
– unresolved point sources– Population Studies
– To avoid peculiarities of individual sources (AGN, Pulsars, SNR…)– Diffuse Gamma ray emission
– Galactic and Extragalactic– Unresolved point sources
– Physics of particle acceleration – Jets in Active Galactic Nuclei (AGN)– energy conversion – shocks in Supernova remnants (SNR)– role of hadrons in radiation processes
• High-energy behaviour of transients :– Gamma Ray Bursts– Solar Flares
• Discovery Potential:– New classes of astrophysical objects– Origin of Extragalactic Background– Searches for Dark Matter and Extra Dimensions– Tests of Lorentz Invariance