Transcript ppt
GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Gamma ray Large Area
Space Telescope
(GLAST)
~ 200 people
Eduardo do Couto e Silva
SLAC
Graduate Student Orientation – Sep 22, 2005
E. do Couto e Silva
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
GLAST Observatory : Timeline and Overview
GLAST will measure the direction, energy and arrival time of celestial g rays
Will 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
LAT Construction ends
Early 2006
Thermal Vacuum Tests
First half of 2006
GLAST
will open
an energy window
never explored before
Spacecraft Integration
2006-2007
Launch Date
Aug 2007
GLAST Burst Monitor
will provide correlative
observations of transient
events in the energy
range
~10 keV – 25 MeV
GLAST Lifetime
5 years (min)
YOUR PhD
200X
E. do Couto e Silva
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Why g rays ?
• Universe is transparent to g rays
g
centers of galaxies
emit gamma rays
• g not affected by magnetic fields
• g probes early Universe
satellite
most violent non-thermal
processes found in Nature
~ 500 km
E. do Couto e Silva
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Science 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
GLAST LAT strengths:
All-sky monitoring
Broad range of time scales
Energy range
•
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
E. do Couto e Silva
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
LAT will Redefine the g Ray Sky
10 yrs of data recorded
before GLAST !
GLAST 1 year
E. do Couto e Silva
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
?
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Relativistic Outflows: AGN jets
Adapted from P. Coppi
•
Most g 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)
E. do Couto e Silva
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Particle Acceleration: Origin of Cosmic Rays
•
Supernova Remnants
– sites of galactic cosmic ray acceleration
•
Question
– Do g rays originate from hadronic or leptonic processes?
•
Measurements in the range of 100 MeV to 100 GeV
- essential ingredient to resolve the origin (p vs e+/-)
Adapted from Aharonian’s talk at the
Texas Symposium 2004
Uchiyama (2003)
Supernova remnant RX J1713.7-3946
TeV g rays (color)
keV X- rays (contours)
GLAST
p0
model
GLAST
E. do Couto e Silva
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e+/model
GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Origin of Dark Matter
z = 50
z = 20
z = 10
z=5
z=1
z=0
Dark matter halo
Milky Way
Neutralino annihilations could create
high energy g rays ….
If true, there may well be
photons in the energy range probed
by GLAST
q
g
q
g
~
~
~
~
10 a11B a12W 3 a13H10 a14 H 20
E. do Couto e Silva
B. Moore, www.nbody.net
Clumpy haloes
increase the signal of high energy g rays !
Neutralinos may not be the answer!
The origin of Dark Matter may come from
Extra Dimensions…
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Graduate Student on GLAST today…
Data Analysis
(is it an instrumental effect
or a software bug?)
Interpretation
(understand how instrument works
to get a better handle on the science)
typical graduate
student…
E. do Couto e Silva
It’s fun to
understand how a
complex system
works
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Final Explanation
GLAST LAT Project
Implement in simulations
what YOU have learned
(Data Challenges)
E. do Couto e Silva
Graduate Student Orientation, Sep 22 , 2005
It only gets better…
2 yrs from now
YOU will be the first
to study one of the most
exciting data sets
Sharpen your
knowledge of Science
BEFORE Launch
(2007)
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GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Do you want to do Science with GLAST?
FACULTY
Blandford, Roger
Bloom, Elliott
[email protected]
Drell, Persis S.
[email protected] [email protected]
Kamae, Tsuneyoshi (Tune)
Michelson, Peter
Romani, Roger
[email protected]
[email protected]
[email protected]
Cameron, Robert
do Couto e Silva, Eduardo
Digel, Seth
Dubois, Richard
Madejski, Grzegorz
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
STAFF
POST- DOC
GRADUATE STUDENTS
YOU
Tajima, Hiroyasu
Wai, Lawrence L.
[email protected] [email protected]
E. do Couto e Silva
Cohen-Tanugi, Johann
[email protected]
Wang, Ping
Healey, Stephen E.
[email protected] [email protected]
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YOUR NAME
[email protected]
GLAST LAT Project
Graduate Student Orientation, Sep 22 , 2005
Come talk to the GLAST Faculty !
•
LAT Construction ends
Early 2006
Thermal Vacuum Tests
First half of 2006
Spacecraft Integration
2006-2007
Launch Date
Aug 2007
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 Lifetime
Blandford, Roger
[email protected]
Found
everywhere…
5 years (min)
YOUR PhD
200X
Bloom, Elliott
Drell, Persis S.
Kamae, Tsuneyoshi (Tune)
[email protected]
[email protected]
[email protected]
Michelson, Peter
Romani, Roger
[email protected]
[email protected]
Most of the time @ Stanford Campus
Most of the time @ SLAC
E. do Couto e Silva
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